Coudé telescopes use a convex secondary mirror like a Cassegrain and an angled mirror like a Newtonian reflector to move the light rays to a focal point away from the telescope. This arrangement is useful when optical equipment is being used that is too heavy to mount directly on the telescope.
Final answer:
Reflecting telescopes, also known as reflectors, focus starlight using mirrors. The main optical element in a reflecting telescope is a concave mirror, which reflects light and forms an image at the focus. Reflecting telescopes have different options for bringing the light to a focus, such as the Cassegrain focus.
Explanation:
Reflecting telescopes, also known as reflectors, focus starlight using mirrors.
The main optical element in a reflecting telescope is a concave mirror, which is curved like the inner surface of a sphere. This mirror reflects light and forms an image at the focus of the mirror. The mirror is coated with a shiny metal, such as silver, aluminum, or occasionally gold, to make it highly reflective.
Reflecting telescopes have different options for where the light is brought to a focus. For example, with a Cassegrain focus, light is reflected by a secondary mirror down through a hole in the primary mirror to an observing station below the telescope.
How does latitude affect climate?
Latitude controls the angle of tilt for Earth’s axis.
Latitude determines the duration of daylight hours.
Latitude causes air temperatures to remain cool at higher elevations.
Latitude causes ocean currents to move in a certain direction.
Answer:
The CORRECT ANSWER is Latitude determines the duration of daylight hours on E2020
The way in which latitude affect climate is: B. Latitude determines the duration of daylight hours.
Climate can be defined as the long-term average atmospheric conditions (weather) prevailing in a specific region and persists for a very long period of time.
Latitude refers to a geographic coordinate that specifies the angular distance of a place North or South of the Earth's surface, which is usually expressed in degrees and minutes.
In Science, latitude is the most important factor that influences the climate of a region because it determines the amount of sunlight that are received in a particular region.
In conclusion, latitude affect climate because it determines the duration of daylight hours.
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A 405 Hz tuning fork and a piano key are struck together, and no beats are heard. When a 402 Hz tuning fork and the same piano key are struck, three beats are heard. What is the frequency of the piano key?
The difference between the frequencies of the piano key and the tuning fork gives the frequency of the beats.
When the tuning fork is 405 Hz, and no beats are heard, then the piano key is also 405 Hz.
When the piano key is 405 Hz and the tuning fork is 402 Hz, then 405 - 402 = 3 beats are heard.
The piano key is 405 Hz.
Final answer:
The frequency of the piano key is 405 Hz, as it matches one tuning fork without producing beats and creates a beat frequency of 3 Hz with the other tuning fork.
Explanation:
To determine the frequency of the piano key, we analyze the beat phenomena observed with tuning forks of known frequency. When two sound waves of slightly different frequencies are played together, they produce a phenomenon known as beats. The frequency of the beats is the absolute difference between the two frequencies. If no beats are heard, it means the two sounds have the same frequency. Thus, when the 405 Hz tuning fork and the piano key are struck together and no beats are heard, the piano key's frequency is 405 Hz. However, with the 402 Hz tuning fork, three beats per second are heard, indicating a difference of 3 Hz. Therefore, the piano key must be producing a frequency of either 402 Hz + 3 Hz = 405 Hz or 402 Hz - 3 Hz = 399 Hz. Since 405 Hz was established as producing no beats with the piano key, the frequency of the piano key is confirmed to be 405 Hz.
A flashlight beam makes an angle of 60 degrees with the surface of the water before it enters the water. in the water what angle does the beam make with the surface? (nwater = 1.33)
a. 22o
b. 0o
c. 30o
d. 60o
e. 68o
When a flashlight beam enters water, it refracts and changes direction. Using Snell's law, we can calculate the angle the beam makes with the water's surface as approximately 41.81 degrees.
Explanation:When light enters a different medium, it changes direction. This phenomenon is called refraction. The angle at which light changes direction depends on the refractive indices of the two media involved. In this case, the light beam is passing from air (with a refractive index of 1.00) into water (with a refractive index of 1.33).
To find the angle the beam makes with the surface of the water, we can use Snell's law: n1 sinθ1 = n2 sinθ2, where n1 and n2 are the refractive indices of the two media, and θ1 and θ2 are the angles of incidence and refraction, respectively.
In this case, n1 = 1.00 (air) and n2 = 1.33 (water). The angle of incidence θ1 is given as 60 degrees. Plugging these values into Snell's law, we can solve for θ2:
n1 sinθ1 = n2 sinθ2
1.00 sin(60) = 1.33 sinθ2
0.866 = 1.33 sinθ2
sinθ2 ≈ 0.650
θ2 ≈ sin-1(0.650)
Using a calculator, we find that θ2 is approximately 41.81 degrees. Therefore, the beam makes an angle of about 41.81 degrees with the surface of the water.
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Why do astronomers hypothesize that a massive black hole lies at the center of m87?
According to Einstein's theory of relativity, a black hole is a "singularity" that consists of a region of the space in which the density of matter tends to infinity. In consequence, this huge massive body has a gravitational pull so strong that not even light can escape from it.
In addition, "the surface" of a black hole is called the event horizon, which is the border of space-time in which the events on one side of it can not affect an observer on the other side.
In other words, at this border also called "point of no return", nothing can escape (not even light) and no event that occurs within it can be seen from outside.
In this sense, and according to the relativity, it is possible to determine where a black hole is if it is "observed" an enormous amount of energy released. So, in accordance to this, galaxies like ours must have a black hole in its center.
On the other hand, the elliptical galaxy Mesier 87 (also called Virgo A, but from now on M87) was showing the above described behaviour, with enormous jets of high-energy particles shooting away from its vicinity . This was imaged by the Hubble Space Telescope years ago; that is why astronemers were hypothesizing about the existence of a massive black hole there.
Well now, on April, 10th 2019 this was demonstrated with the publication of the image, for the first time, of the event horizon of the black hole in M87. This is the first time in human history a picture of a black hole is taken.
This was done by the huge effort of diverse scientist and by the syncronization of eight radio telescopes scattered across the Earth (located at: Hawaii, Spain, Chile, Mexico, Arizona and the South Pole), which took the same point of the sky at the same time.
What is the atomic bomb equivalent to a 7.0 earthquake
Answer:
199,000 tons.
Explanation:
A 7.0 earthquake has an equivalence of 199,000 tons of TNT.
please help on this one?
I believe that it is d correct me if wrong because the higher the temperature the more active the molecules are gonna be, but the graph does not explicitly state that, so you can say the answer is d (if not the answer is c) (sorry if wrong)
What is the maximum height a 100-w engine can lift a 100-kg man in 3.00 minutes?
Answer:
18.4 m
Explanation:
The force that the engine must apply at least to lift the man must be equal to the weight of the man:
[tex]F=mg=(100 kg)(9.8 m/s^2)=980 N[/tex]
The work done by the engine is the product of the force applied, F, and the height at which the man is lifted, h:
[tex]W=Fh[/tex] (1)
while the power of the engine is defined as:
[tex]P=\frac{W}{t}[/tex]
where
P = 100 W
t = 3.00 min = 180 s
From this equation, we find the work:
[tex]W=Pt=(100 W)(180 s)=18,000 J[/tex]
And solving (1) for h, we find the maximum height:
[tex]h=\frac{W}{F}=\frac{18,000 J}{980 N}=18.4 m[/tex]
Batteries (e.g., lead-acid batteries) store chemical energy and convert it to electric energy on demand. Batteries do not store electric charge or charge carriers. Charge carriers (electrons) enter one terminal of the battery, acquire electrical potential energy, and exit from the other terminal at a lower voltage. Remember the electron has a negative charge! It is convenient to think of positive carriers flowing in the opposite direction, that is, conventional current, and exiting at a higher voltage. (Benjamin Franklin caused this mess!) For a battery rated at 12 V and 350 A-h, determine: a. The rated chemical energy stored in the battery. b. The total charge that can be supplied at the rated voltage.
Answer:
A battery is a device consisting of one or more electrochemical cells with external connections provided to power electrical devices such as flashlights, smartphones, and electric cars. When a battery is supplying electric power, its positive terminal is the .... Batteries convert chemical energy directly to electrical energy.
Explanation:
The rated chemical energy stored in the battery would be 15120000 Joules.
The total charge that can be supplied at the rated voltage would be 1260000 Coulombs.
What is power?The rate of doing work is known as power. The Si unit of power is the watt.
Power =work/time
The mathematical expression for the electric power is as follows
P = VI
As given in the problem For a battery rated at 12 V and 350 A-h,
A. The rated chemical energy of the battery,
energy = power ×time
= 12×350 ×3600
= 15120000 Joules
B.The total charge that can be supplied at the rated voltage,
total charge = current ×time
= 350 × 3600 Coulombs
= 1260000 Coulombs
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The crest of a water wave moves _________ to the direction the wave energy moves. Parallel perpendicular
Perpendicular
Explanation;The crest of a water wave moves perpendicular to the direction the wave energy moves.A transverse wave is a wave in which particles move up and down or side-to-side at right angles or perpendicular to the direction the wave travels.Examples of these waves are: vibrations in strings, ripples on water surface and electromagnetic waves. In a transverse wave, the particles of the medium oscillate in a direction perpendicular to the direction of propagation.A transformer has 1400 turns on the primary and 110 on the secondary.?If the primary is connected to a 120V outlet and draws 3.0x10^-2 Amps, what are the voltage and current of the secondary? A) 1500 V, 2.4x10^-3 A B) 1500 V, 0.38 A C) 9.4 V, 2.4x10^-3 A D) 9.4 V, 0.38 A
Answer:
D) 9.4 V, 0.38 A
1) Voltage in the secondary coil: 9.4 V
The transformer equation states that:
[tex]\frac{V_p}{N_p}=\frac{V_s}{N_s}[/tex]
where
Vp = 120 V is the voltage in the primary coil
Np = 1400 is the number of turns in the primary coil
Vs = ? is the voltage in the secondary coil
Ns = 110 is the number of turns in the secondary coil
Solving the formula for Vs, we find
[tex]V_s = N_s \frac{V_p}{N_p}=(110)\frac{120 V}{1400}=9.4 V[/tex]
2) Current in the secondary coil: 0.38 A
A transformer is considered to be 100% efficient: it means that there is no loss of power, so the power in input is equal to the power in output
[tex]P_i = P_o\\V_p I_p = V_s I_s[/tex]
where
Vp = 120 V is the voltage in the primary coil
[tex]I_p = 3.0\cdot 10^{-2} A[/tex] is the current in the primary coil
Vs = 9.4 V is the voltage in the secondary coil
[tex]I_s[/tex] is the current in the secondary coil
Solving the equation for [tex]I_s[/tex],
[tex]I_s = \frac{V_p I_p}{V_s}=\frac{(120 V)(3.0\cdot 10^{-2}A)}{9.4 V}=0.38 A[/tex]
The main difference between a radio wave and a sound wave is their different
Answer:
Direction of oscillations
Explanation:
- Radio waves are part of the electromagnetic waves. Electromagnetic waves consist of oscillating electric and magnetic field. Electromagnetic waves are transverse, which means that the oscillation (of the fields) occurs in a direction perpendicular to the direction of propagation of the wave.
Electromagnetic waves are also the only type of waves that can travel through a vacuum, since they do not need a medium to propagate.
- Sound waves are mechanical waves, which consists of periodic disturbances of a medium. Sound waves are longitudinal, which means that the direction of their oscillation occurs parallel to the direction of propagation of the wave, creating alternating regions of higher density (compressions) and lower density (rarefactions) of particles.
Mechanical waves, unlike electromagnetic waves, always need a medium to propagate.
Rising warm air transports thermal energy by
Rising warm air transports thermal energy by ( water vapor).
Water vapor.
If you travel for three hours at a speed of 30 km/h , how far will you go?
Distance = (speed) x (time) <== This is important. You should memorize it.
Distance = (30 km/hr) x (3 hr)
Distance = (30 x 3) (km/hr x hr)
Distance = 90 km
If you travel for three hours at a speed of 30 km / h, then you would go 90 kilometers in 3 hours.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is a meter/second.
As given in the problem If you travel for three hours at a speed of 30 km/ h, then we have to find out the distance traveled in 3 hours.
The distance traveled in 3 hours = 30 × 3
= 90 km
Thus, If you travel for three hours at a speed of 30 km / h, then you would go 90 kilometers in 3 hours.
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The fundamental force underlying all chemical reactions is
A) gravitational.
B) nuclear.
C) centripetal.
D) electrical.
E) none of these.
D) Electrical
Electrical Force:
Electric forces are responsible for almost every single chemical reaction that occurs in your body. Almost all of biochemistry relies on understanding how these forces cause electrons to move between atoms, and the changes in the structure or composition that occur when electrons move between atoms.Electrostatic forces become important when particle material is electrically insulating so the electric charge can be retained.For example: The charge in a bulb. Electric circuits.Thus, option D is correct.
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The fundamental force underlying all chemical reactions is electrical. Hence option D is correct.
Almost every chemical reaction that takes place in your body is triggered by electric forces. Understanding how these forces drive electrons to travel between atoms and the alterations in the structure or composition that result from this movement are essential to almost all of biochemistry.
When particle material is electrically insulating enough that the electric charge may be maintained, electrostatic forces become significant. For instance: a bulb's charge. electrical networks.
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Which of the following statements about scientific models is accurate?
A.They are always more complex than the object, process, or system they represent.
B.They are always more simpler than the object, process, or system they represent.
C.They are always more smaller than the object, process, or system they represent.
D.They are always more larger than the object, process, or system they represent.
Answer:
They are always simpler than the object, process, or system they represent.
Explanation:
Water flows through a horizontal pipe. The diameter of the pipe at point b is larger than the diameter of the pipe at point a. Where is the speed of the water the greatest?
The speed of the water is the greatest at point B
The speed of water flowing through a pipe is greatest at the point where the pipe's diameter is smallest. So, in this scenario, the speed of water is greatest at Point A.
Explanation:In fluid dynamics, a principle known as Bernoulli's Principle explains that as the cross-sectional area of a pipe changes, so does the speed of fluid flowing through it. In your scenario, water is flowing through a horizontal pipe with different diameters at Point A and Point B. As per Bernoulli's Principle, the water speed is greatest at the point where the pipe's diameter is smallest. Therefore, since Point A has a smaller diameter than Point B, the speed of the water is greatest at Point A.
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Mechanical advantage allows you to apply a force over a what distance to what the distance an object moves
Mechanical advantage allows you to apply a force over a short distance to increase the distance and object moves.
A student wants to demonstrate entropy using the songs on her portable music player. What should she do to demonstrate the highest entropy?
A.Play only the classical songs on shuffle.
B.Play all the songs in order by artist.
C.Play all the songs on shuffle.
D.Play all the songs in alphabetical order.
play all the songs in alphabetical order
Which option correctly defines a generator?
1. a device that converts thermal energy into mechanical energy
2. a device that converts light energy into electrical energy
3. a device that converts electrical energy into mechanical energy
4. a device that converts mechanical energy into electrical energy
The answer is 2. A generator takes the gas and runs it through the carburetor and then that takes it to the electrical port to be converted into electricity.
A generator is a device that converts mechanical energy into electrical energy using electromagnetic induction.
The correct option is D.
A generator is a device that converts mechanical energy into electrical energy. It does this by using the principles of electromagnetic induction, where a magnet and a coil of wire are used to create a flow of electrons, resulting in the generation of electricity. The mechanical energy required to turn the magnet or the coil of wire can come from various sources, such as steam, water, wind, or even the movement of a hand crank.
For example, in a hydroelectric power plant, water flowing over a turbine causes the turbine to spin, which in turn rotates a magnet inside a coil of wire. As the magnet moves, it creates a changing magnetic field, which induces an electric current in the wire, generating electricity.
Therefore, the correct option that defines a generator is option 4: a device that converts mechanical energy into electrical energy.
Hence The correct option is D.
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What equation would you use to find the time taken for an object to travel a set distance?
Time = (the set distance) / (the object's traveling speed)
A person pushes on a 57-kg refrigerator with a horizontal force of 267 N; the - sign indicates that the force points in the +x direction. The coefficient of static friction is 0.65. (a) If the refrigerator does not move, what are the magnitude and direction of the static frictional force that the floor exerts on the refrigerator? (b) What is the magnitude of the largest pushing force that can be applied to the refrigerator before it just begins to move?
(a) -267 N
Explanation: if the refrigerator is not moving, it means that the net force acting on it is zero.
We are only interested in the motion along the horizontal direction; there are two forces acting in this direction:
- The pushing force, forward, F=+267 N
- The static frictional force, backward, [tex]F_f[/tex]
Since the net force must be zero, we have
[tex]F+F_f =0F_f = -F = -267 N[/tex]
(b) 363.1 N
The largest pushing force that can be applied to the refrigeratore before it begins to move is equal to the magnitude of the maximum static frictional force, which is given by:
[tex]F_f = \mu mg[/tex]
where
[tex]\mu=0.65[/tex] is the coefficient of static friction
m = 57 kg is the mass of the refrigerator
g = 9.8 m/s^2 is the gravitational acceleration
Substituting,
[tex]F_f = (0.65)(57 kg)(9.8 m/s^2)=363.1 N[/tex]
The static frictional force that the floor exerts on the refrigerator is 267 N in the -x direction. The largest pushing force that can be applied before the refrigerator starts to move is 362.59 N.
Explanation:The subject matter of this question falls under the branch of Physics, specifically dealing with static friction and the concept of force. To answer your questions:
(a) Magnitude and direction of static frictional forceStatic frictional force is equal to the applied force until the object starts to move. Here, you are applying a force of 267 N horizontally on the refrigerator. Since the refrigerator does not move, the static frictional force that the floor exerts on the refrigerator is also 267 N in the -x direction, opposite to the force you're applying.
(b) Magnitude of the largest pushing force before movementAt the point of impending motion, the force you apply equals the maximum static frictional force. This can be calculated using the following formula:
fs(max) = µsN
where µs represents the coefficient of static friction and N is the normal force. The value of N is calculated by multiplying the mass of the refrigerator by the acceleration due to gravity.
N = mg = (57 kg)(9.8 m/s²) = 558.6 N
Therefore, the largest pushing force fs(max) that can be applied to the refrigerator before it begins to move is :
fs(max) = (0.65)(558.6 N) = 362.59 N
So, a force greater than 362.59 N needs to be applied to make the refrigerator start moving.
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Atomic physicists usually ignore the effect of gravity within an atom. To see why, we may calculate and compare the magnitude of the ratio of the electrical force and gravitational force Fe Fg between an electron and a proton separated by a distance of 3 m. What is the magnitude of the electrical force? The Coulomb constant is 8.98755 × 109 N · m 2 /C 2 , the gravitational constant is 6.67259 × 10−11 m3 /kg · s 2 , the mass of a proton is 1.67262 × 10−27 kg, the mass of an electron is 9.10939 × 10−31 kg, and the elemental charge is 1.602 × 10−19 C. Answer in units of N. What is the ratio of the magnitude of the electrical force to the magnitude of the gravitational force? Answer in units of N.
Answer:
[tex]2.27\cdot 10^{49}[/tex]
Explanation:
The gravitational force between the proton and the electron is given by
[tex]F_G=G\frac{m_p m_e}{r^2}[/tex]
where
G is the gravitational constant
[tex]m_p[/tex] is the proton mass
[tex]m_e[/tex] is the electron mass
r = 3 m is the distance between the proton and the electron
Substituting numbers into the equation,
[tex]F_G=(6.67259\cdot 10^{-11} m^3 kg s^{-2})\frac{(1.67262\cdot 10^{-27}kg) (9.10939\cdot 10^{-31}kg)}{(3 m)^2}=1.13\cdot 10^{-68}N[/tex]
The electrical force between the proton and the electron is given by
[tex]F_E=k\frac{q_p q_e}{r^2}[/tex]
where
k is the Coulomb constant
[tex]q_p = q_e = q[/tex] is the elementary charge (charge of the proton and of the electron)
r = 3 m is the distance between the proton and the electron
Substituting numbers into the equation,
[tex]F_E=(8.98755\cdot 10^9 Nm^2 C^{-2})\frac{(1.602\cdot 10^{-19}C)^2}{(3 m)^2}=2.56\cdot 10^{-19}N[/tex]
So, the ratio of the electrical force to the gravitational force is
[tex]\frac{F_E}{F_G}=\frac{2.56\cdot 10^{-19} N}{1.13\cdot 10^{-68}N}=2.27\cdot 10^{49}[/tex]
So, we see that the electrical force is much larger than the gravitational force.
The ratio of the magnitude of the electrical force to the magnitude of the gravitational force will be 2.27×10⁴⁹.
What is electric force?Force on the particle is defined as the application of the force field of one particle on another particle. It is a type of virtual force.
The gravitational force is;
[tex]\rm F_G= \frac{Gm_1m_2}{r^2} \\\\ \rm F_G= \frac{6.67\times 10^{-11}1.67\times10^{-27}9.10\times10^{-31}}{(3m)^2}\\\\ \rm F_G=1.13\times10^{-68}[/tex]
The electrical force between the two charges is given by;
[tex]\rm F_E=K\frac{KQ_1Q_2}{r^2} \\\\ \rm F=9\times10^9\frac{1.6\times10^{-19}\times9.1\times10^{-31}Q_2}{(3)^2} \\\\ \rm F_E=2.56\times 10^{-19}[/tex]
So, the ratio of the electrical force to the gravitational force is
[tex]\rm R= \frac{F_E}{F_G} \\\\ \rm R= \frac{2.56\times10^{-19}}{1.13\times10^{-68}} \\\\ \rm R= 2.27\times 10^{49}[/tex]
Hence the ratio of the magnitude of the electrical force to the magnitude of the gravitational force will be 2.27×10⁴⁹.
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Why does water form spherical drops on some surfaces
By the cohesive forces of the surface layers and other forces including gravity and other drops of virtually all liquids ♀️
Consider two bicycle riders, A and B. The two riders have equal masses Mrider A = Mrider B and their respective bicycles also have similar frames, Mframe A = Mframe B . Finally, the wheels of the two bicycles have equal masses Mwheel A = Mwheel B and equal radii R wheel A = R wheel B but different mass distributions: the wheels of bike A have most of their masses at the rims, Wheel A, while the wheels of bike B have their masses ‘spread’ evenly over the whole wheel area, Wheel B. The two cyclists travel at the same speed on level ground. They approach a low hill and decide to coast up instead of hard pedalling. At the top of the hill, which of the two bikes will have a larger speed? Assume no friction nor air resistance, and all the wheels roll on the ground without slipping.
In a scenario where two bikes with different wheel mass distributions coast up a hill, the bike with more mass at the wheel's rim (wheel A) will maintain a greater speed due to a larger rotational inertia. That's because more kinetic energy is stored in rotational motion, which is more efficient in maintaining speed uphill.
Explanation:The subject here is physics shedding light on the concept of rotational inertia with a scenario involving two bicycle riders, A and B, on a hill. With all mass and physical attributes being equal, differences in how the mass distribution is in their bicycle wheels would determine how they would coast up a hill.
In this scenario, the bicycle A's wheel with most of its mass at the rims (wheel A) would have a larger rotational inertia than the wheel of bicycle B which has its mass evenly distributed. When they coast up the hill, rider A will maintain a greater speed to the top because the cyclists first store energy in the wheels during pedaling. The wheel with greater rotational inertia (wheel A) will then lose less speed because it retains more of that energy.
This happens because, in the case of rolling objects, kinetic energy gets split between rotational and linear motion. The distribution of mass influences how the kinetic energy is split. For wheel A with more mass towards the rim, more kinetic energy goes into rotational motion which does a better job at maintaining the speed uphill.
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In the given scenario, bike B, with its wheel mass evenly distributed, will reach the top of the hill at a higher speed due to the relationship between the moment of inertia and kinetic energy.
Explanation:This question requires an understanding of the physics concepts of rotational motion and moment of inertia. The two bikes are identical in every aspect except the distribution of mass in their wheels. The bike A wheel, with most of its mass at the rim, has a higher moment of inertia. As the bikes coast upwards without pedaling, the kinetic energy is converted to potential energy. The kinetic energy has two forms: translational and rotational. The bike with the higher moment of inertia (bike A) will have a larger proportion of its energy in rotational form. When they reach the incline, both will begin converting potential energy back into kinetic, but because bike A has a higher portion as rotational, it will have less translational (directly related to speed) compared to bike B. Therefore, bike B will reach the top with a higher speed.
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When does a convex lens act like a magnifying glass
A convex lens functions as a magnifying glass when an object is positioned closer to it than its focal length, resulting in an enlarged, virtual, and upright image.
A convex lens acts like a magnifying glass when an object is placed within its focal length. In this situation, the image formed is virtual, upright, and larger than the object itself. When the object is closer to the lens than the focal length (f), the lens is capable of magnifying the object. This is referred to as a case 2 image. As the magnifier is pulled away from the object to the point of blurring, this indicates that the lens has reached the focal length. Beyond this distance, the image will become inverted. To effectively use a convex lens for magnification, the object must therefore be positioned at a distance closer than the lens's focal length (do < f).
friction heats up the brake pads of a car as it stops what is this an example of?
This an example of the law of Conservation of Energy.
The car has quite a bit of kinetic energy while it's rolling. If you want to stop it, you have to take that kinetic energy away from the car, AND you have to do something with that energy.
If it's an electric car or hybrid, you can turn the kinetic energy into electrical energy, put it back into the batteries, and use it again later.
If it's just an ordinary gas guzzler, there's no way to save the kinetic energy. You use the car's kinetic energy to scrape two rough surfaces together, that turns it into heat, and the air blows the heat away.
Next time you want the car to roll again, you have to make more, new, kinetic energy. So you take chemical energy out of more gas, and you use the motor to turn the chemical energy into kinetic energy.
It's all the law of Conservation of Energy ... in action.
Starting from rest, a disk rotates about its central axis with constant angular acceleration. in 6.00 s, it rotates 44.5 rad. during that time, what are the magnitudes of (a) the angular acceleration and (b) the average angular velocity? (c) what is the instantaneous angular velocity of the disk at the end of the 6.00 s? (d) with the angular acceleration unchanged, through what additional angle (rad) will the disk turn during the next 6.00 s?
a. The disk starts at rest, so its angular displacement at time [tex]t[/tex] is
[tex]\theta=\dfrac\alpha2t^2[/tex]
It rotates 44.5 rad in this time, so we have
[tex]44.5\,\mathrm{rad}=\dfrac\alpha2(6.00\,\mathrm s)^2\implies\alpha=2.47\dfrac{\rm rad}{\mathrm s^2}[/tex]
b. Since acceleration is constant, the average angular velocity is
[tex]\omega_{\rm avg}=\dfrac{\omega_f+\omega_i}2=\dfrac{\omega_f}2[/tex]
where [tex]\omega_f[/tex] is the angular velocity achieved after 6.00 s. The velocity of the disk at time [tex]t[/tex] is
[tex]\omega=\alpha t[/tex]
so we have
[tex]\omega_f=\left(2.47\dfrac{\rm rad}{\mathrm s^2}\right)(6.00\,\mathrm s)=14.8\dfrac{\rm rad}{\rm s}[/tex]
making the average velocity
[tex]\omega_{\rm avg}=\dfrac{14.8\frac{\rm rad}{\rm s}}2=7.42\dfrac{\rm rad}{\rm s}[/tex]
Another way to find the average velocity is to compute it directly via
[tex]\omega_{\rm avg}=\dfrac{\Delta\theta}{\Delta t}=\dfrac{44.5\,\rm rad}{6.00\,\rm s}=7.42\dfrac{\rm rad}{\rm s}[/tex]
c. We already found this using the first method in part (b),
[tex]\omega=14.8\dfrac{\rm rad}{\rm s}[/tex]
d. We already know
[tex]\theta=\dfrac\alpha2t^2[/tex]
so this is just a matter of plugging in [tex]t=12.0\,\mathrm s[/tex]. We get
[tex]\theta=179\,\mathrm{rad}[/tex]
Or to make things slightly more interesting, we could have taken the end of the first 6.00 s interval to be the start of the next 6.00 s interval, so that
[tex]\theta=44.5\,\mathrm{rad}+\left(14.8\dfrac{\rm rad}{\rm s}\right)t+\dfrac\alpha2t^2[/tex]
Then for [tex]t=6.00\,\rm s[/tex] we would get the same [tex]\theta=179\,\rm rad[/tex].
An electron in a tv picture tube is accelerated through a potential difference of 10 kv before it hits the screen. What is the kinetic energy of the electron in electron volts?
Answer:
10,000 eV
Explanation:
Due to the law of conservation of energy, the kinetic energy of the electron at the end of its path is equal to its initial electric potential energy, given by:
[tex]U=q\Delta V[/tex]
where
q is the electron charge
[tex]\Delta V[/tex] is the potential difference
Here we have:
[tex]q=1 e[/tex] is the electron's charged
[tex]\Delta V=10 kV=10,000 V[/tex] is the potential difference
Substituting into the formula, we have
[tex]U=(1e)(10,000 V)=10,000 eV[/tex]
Final answer:
An electron accelerated through a potential difference of 10 kv gains 10,000 eV of kinetic energy, as there's a direct relationship between the potential difference in volts and the kinetic energy in electron volts.
Explanation:
The question involves an electron that is accelerated through a potential difference of 10 kv (10,000 volts) before it hits the screen, and you're asked to find the kinetic energy of the electron in electron volts (eV). The relationship between the potential difference an electron is accelerated through and the kinetic energy it gains is direct and linear. For every 1 V of potential difference, an electron gains 1 eV of kinetic energy.
Therefore, if an electron is accelerated through a potential difference of 10,000 volts (10 kv), it gains 10,000 eV of kinetic energy. This straightforward calculation is based on the basic principle that the kinetic energy gained by an electron (in eV) is numerically equivalent to the potential difference (in volts) it is accelerated through.
What type of light has the wavelength of:
(Show Work!)
A) 5.0 x 10^-4 m?
B) 2.4 x 10^-8 m?
C) 12mm?
Wavelength A (5.0 x 10⁻⁴ m) corresponds to visible light (green), B (2.4 x 10⁻⁸ m) corresponds to gamma rays, and C (12 mm) corresponds to microwaves in the electromagnetic spectrum.
Explanation:The types of light associated with different wavelengths can be understood by examining the electromagnetic spectrum.
A) 5.0 x 10⁻⁴ m (or 500 nm): This wavelength lies in the visible spectrum, particularly in the region that would appear as green light.B) 2.4 x 10⁻⁸ m (or 0.024 nm): This extremely short wavelength is characteristic of gamma rays, which are a form of ionizing radiation on the high-energy end of the electromagnetic spectrum.C) 12 mm: This wavelength is within the microwave range of the electromagnetic spectrum, which is used in various technologies including microwave ovens and certain communication devices.How does the number of each type of particle in a sodium ion compare with the number of each type of particle in a sodium atom?