Explanation:
Wave
It is the periodic disturbance in a medium.
Types of Wave
There are two types of wave in general depending upon their propagation through a substance.
• Mechanical
• Electromagnetic
Mechanical Wave
It is the kind of wave which needs medium to travel. For example: Sound Wave
That means sound can be heard only whenever there is presence of certain substance like water, glass, air etc .It can’t be heard in vacuum no matter how loud is the sound.
Electromagnetic Wave
Is that which can travel through medium as well as through vacuum. For example: Light
But unlike sound, light can be seen through a substance or in vacuum. That is the reason it is referred as electromagnetic wave.
A piece of metal is 4 cm by 10 cm
by 2 cm. Find its mass if it has a
density of 2 g/cm'.
Answer:
m=ρV
V=LxWxD
V=4x10x2=80
m=2*80=160 grams
Explanation:
Mass is equal to density multiply by volume of object. Volume of rectangle pice can be calculated by multiplying all sides.
Final answer:
The mass of the metal piece is calculated by first obtaining the volume, which is 80 cm³, and then using the density to find the mass, resulting in a mass of 160 g.
Explanation:
Metals are components or with brilliant, hard, moldable, blending, pliable properties. Name of metal (material) types are - Gold, Silver, Aluminum, Copper, Iron, and so on. They are utilized to create devices as they might be strong and effectively formed.
To find the mass of a piece of metal with given dimensions and density, first calculate its volume and then apply the formula for mass. The volume of a rectangular piece of metal is found by multiplying its length, width, and height.
Volume = Length x Width x Height = 4 cm x 10 cm x 2 cm = 80 cm³.
Once the volume is known, the mass can be calculated using the given density:
Mass = Density x Volume = 2 g/cm³ x 80 cm³ = 160 g.
Therefore, the mass of the metal piece is 160 grams.
If sodium has one valence electron and sulfur has six, how many sodium atoms are needed to form an ionic bond with sulfur?
ITS TWO
Answer: two
Explanation:
Answer:
Its 2
Explanation:
This compound has a central Sulfur atom surrounded by 4 Oxygens in a covalent bonds, with an overall charge of negative 2 and 2 Sodium atoms with a charge of positive one. Thus making the answer 2.
If an airplane undergoes a displace-
ment of 500. km northwest in 1.2 hr,
what is its average velocity?
Final answer:
The average velocity of the airplane is calculated using the formula: velocity equals displacement divided by time. For a displacement of 500 km northwest over 1.2 hours, the average velocity is 416.67 km/h northwest.
Explanation:
Calculating Average Velocity
To calculate the average velocity of an airplane that has a displacement of 500 km northwest in 1.2 hours, we need to use the formula for average velocity, which is the displacement divided by the time taken. Since the displacement is given as a northwest direction, we are dealing with vector quantities, meaning that both magnitude and direction are important. However, for average velocity, we are concerned with the magnitude of this vector quantity.
The formula to calculate average velocity, v, is:
v =[tex]rac{d}{t}[/tex]
In this problem:
Displacement (d) = 500 km northwest
Time (t) = 1.2 hours
To find the average velocity, we divide the displacement by the time:
v = rac{500}{1.2} = 416.67 km/h northwest
The airplane's average velocity is 416.67 km/h in the northwest direction.
Suppose you are given a position versus time graph. The slope of a line tangent to a point on the curve of this graph describes what quantity?
A: Displacement
B: acceleration
C:Instantaneous velocity
D: position
Alo tell me why it’s the answer that it is
Answer:
Explanation: ur answer is c. If I remember correctly. thnx
John and Daniel are playing tug-of-war together. John is exerting 10 N of force. Daniel is exerting 12 N of force. What is their net force?
Answer: 2 N in Daniel's direction.
Answer: 2N in Daniel's direction.
Explanation:
Since, both of them are playing a game of tug and war, the resultant(net) force consists of opposing forces.
Net force= 12N-10N = 2N
And the net force is in Daniel's direction because Daniel exerted greater force.
In the tug-of-war scenario between John and Daniel, the net force is 2 N in Daniel's direction, as his force is 12 N compared to John's 10 N. The forces are unbalanced with the larger force determining the direction of the net force.
When John and Daniel play tug-of-war, John exerts a force of 10 N while Daniel exerts a slightly higher force of 12 N. To find the net force, we consider the direction of the forces as well. Since they are exerting forces in opposite directions, the net force is the difference between the two forces. Therefore, the net force is 12 N (Daniel's force) - 10 N (John's force) = 2 N in the direction of the larger force, which is Daniel's direction.
Understanding tug-of-war forces is an interesting way to conceptualize the principles of balanced and unbalanced forces. In this case, the forces are unbalanced because one player is exerting more force than the other, causing the net force to shift in one direction.
Your roommate drops your wallet down to you from the third floor window of your apartment, which is 11.5m from the ground. what is the velocity of the wallet when you catch it. ( Assume you catch the wallet right before it hits the ground)
Answer:
15.0 m/s
Explanation:
Take the down direction to be positive.
Given:
Δy = 11.5 m
v₀ = 0 m/s
a = 9.8 m/s²
Find: v
v² = v₀² + 2aΔy
v² = (0 m/s)² + 2 (9.8 m/s²) (11.5 m)
v = 15.0 m/s
A 1165 kg car traveling at 55 km/h is brought to a stop while skidding 38 m. Calculate the work done on the car by the friction forces.
The work done is [tex]-1.36\cdot 10^5 J[/tex]
Explanation:
According to the work-energy theorem, the work done by external forces on the car is equal to the change in kinetic energy of the car. Therefore, we have:
[tex]W=\Delta K\\W = \frac{1}{2}mv^2-\frac{1}{2}mu^2[/tex]
where
W is the work done by the external forces
m is the mass of the car
v is its final velocity
u is its initial velocity
In this problem, we have:
m = 1165 kg
[tex]u=55 km/h =15.3 m/s[/tex]
v = 0 (the car comes to a stop)
Solving for W, we find the work done by the frictional forces:
[tex]W=\frac{m(v^2-u^2)}{2}=\frac{(1165)(0-15.3^2)}{2}=-1.36\cdot 10^5 J[/tex]
Where the negative sign indicates that the direction of the force is opposite to the direction of motion of the car.
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The motion of roller coasters depends upon the conversion of potential and kinetic energy. A 100-kg car starts from rest at the top of a hill with a height of 50 m. Which of the following is this car's kinetic energy at the bottom of the hill?
Answer:
K=49,000 Joule
Explanation:
Kinetic and Gravitational Potential Energy
The principle of conservation of the mechanical energy states that the mechanical energy of a system of particles remains unaltered unless some external non-conservative forces acting on the system.
The total mechanical energy present in the roller coasters is the sum of their kinetic and gravitational potential energies:
[tex]\displaystyle ME=\frac{m.v^2}{2}+m.g.h[/tex]
If the roller coaster decreases its height, the speed will increase and compensates for the loss of potential energy. If the roller coaster increases its height, it will go slower and eventually stop until running out of kinetic energy.
We know the car starts from rest at the top of the hill of 50 m. This implies that the mechanical energy is
[tex]\displaystyle ME=\frac{100.0^2}{2}+100.(9.8).(50)=49,000\ J[/tex]
When it reaches the bottom of the hill, the potential energy is zero, thus the car has only kinetic energy.
Kinetic energy at the bottom = 49,000 Joule
The roller coaster's potential energy at the top of the hill is converted to kinetic energy at the bottom. Assuming no energy losses, the car's kinetic energy at the bottom is 49050 J, equal to the potential energy it had at the top.
Explanation:Understanding Energy Conservation in a Roller Coaster
The question addresses the principle of energy conservation in physics, particularly as it pertains to a roller coaster's movement. When the roller coaster is at the top of a hill, it possesses a maximum amount of gravitational potential energy due to its position. As it descends, this potential energy is converted into kinetic energy, which is dependent on the mass and velocity of the coaster car. To find the kinetic energy at the bottom of the hill, we can use the equation KE = ½mv², where m is mass and v is velocity.
To determine the kinetic energy at the bottom, we first need to calculate the potential energy at the top. The potential energy (PE) can be found using the formula PE = mgh, where g is the acceleration due to gravity (approximately 9.81 m/s² on Earth) and h is the height. For a roller coaster car with a mass of 100 kg at a height of 50 m, the potential energy is PE = 100 kg × 9.81 m/s² × 50 m, which equates to 49050 J (joules). Assuming no energy is lost to friction or air resistance, this potential energy will be entirely converted into kinetic energy at the bottom of the hill.
Thus, the car's kinetic energy at the bottom equals the potential energy at the top, which is 49050 J.
Which list gives the proper sequence of energy changes that occur in a hydroelectric plant? The mechanical energy of the turbine rotates the generator parts The turbine blades capture the kinetic energy of the water Electrical energy is transferred via power lines The generator produces electrical energy Electrical energy is transferred via power lines The turbine blades capture the kinetic energy of the water The generator produces electrical energy The mechanical energy of the turbine rotates the generator parts The generator produces electrical energy The mechanical energy of the turbine rotates the generator parts The turbine blades capture the kinetic energy of the water Electrical energy is transferred via power lines The turbine blades capture the kinetic energy of the water The mechanical energy of the turbine rotates the generator parts The generator produces electrical energy Electrical energy is transferred via power lines
Answer:
The turbine blades capture the kinetic energy of the water The mechanical energy of the turbine rotates the generator parts. The generator produces the electrical energy that is then transferred via power lines
Explanation:
Hydroelectric Plant
It's widely used to transform potential gravitational energy of the water located at a higher height into electrical energy. A dam is constructed in the potential location of the power plant, so all the water is directed to the turbines at a lower level from the face of the water. This water enters a set of pipes that send the stream to the turbines, whose blades are moved by the water, capturing its kinetic energy. The turbine now has enough mechanical energy to have the generation system moving and transform mechanical into electrical energy. That electric energy is finally sent to the consuming centers through power lines.
Thus, the correct sequence is:
The turbine blades capture the kinetic energy of the water The mechanical energy of the turbine rotates the generator parts. The generator produces the electrical energy that is then transferred via power lines
Answer:The turbine blades capture the kinetic energy of the water
The mechanical energy of the turbine rotates the generator parts
The generator produces electrical energy
Electrical energy is transferred via power lines
Explanation:
bc I just took the k12 test
A block of wood is found to have the dimensions of 6.21 cm x 4.63 cm x 5.34 cm. Calculate the volume of the block.
*Apparently its not 153.54 cm^3, so I need the right answer.*
The volume is [tex]153.54 cm^3[/tex]
Explanation:
The volume of the block, assuming it is a parallelepided, is given by
[tex]V=L\cdot W \cdot H[/tex]
where
L is the length
W is the width
H is the height
For the block in this problem, we have
L = 6.21 cm
W = 4.63 cm
H = 5.34 cm
Therefore, the volume is
[tex]V=(6.21)(4.63)(5.34)=153.54 cm^3[/tex]
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2. Does the bowling ball have more potential energy or kinetic energy as it is half way through its fall
.
Answer:
Equal
Explanation:
Recall that KE = 1/2(m)(v²) and PE = mgh, where m is mass, g is gravity, v is velocity, and h is height.
When the bowling ball is first dropped, it has a maximum potential energy but minimum kinetic energy. The height is max, so the potential energy will be greatest. Velocity is 0, so kinetic energy will be 0.
When the bowling ball is half way through its fall, the height will be half the initial height and the velocity will be half of the final velocity.
When the bowling ball is at the bottom and reaches the ground, the height is 0 so potential energy is 0 while the kinetic energy is max because velocity is the greatest.
Answer:
I think that it is kinetic because it is gaining speed through out it's fall.
The density of mercury is 1X36X10'4 kg/m'3 at 0c. What is it density at 25 c? The coefficient of volume expansion of mercury is 2.8C10'-4
The density at 25 degrees is [tex]1.35\cdot 10^4 kg/m^3[/tex]
Explanation:
The density of a material is given by
[tex]d=\frac{m}{V}[/tex]
where
m is its mass
V is its volume
The volume of a material changes as a function of the temperature, according to
[tex]V(T)=V_0(1+\alpha (T-T_0))[/tex]
where
[tex]V_0[/tex] is the volume at temperature [tex]T_0[/tex]
[tex]\alpha[/tex] is the coefficient of volume expansion
In this problem, let's take a sample of mercury of mass
m = 1 kg
The density at 0 degrees is
[tex]d_0 = 1.36\cdot 10^4 kg/m^3[/tex]
So the corresponding volume is
[tex]V_0 = \frac{m}{d_0}=\frac{1}{1.36\cdot 10^4}=7.35\cdot 10^{-5} m^3[/tex]
For mercury,
[tex]\alpha = 2.8\cdot 10^{-4} ^{\circ}C^{-1}[/tex]
So the volume when [tex]T=25^{\circ}C[/tex] is
[tex]V(25)=(7.35\cdot 10^{-5})(1+2.8\cdot 10^{-4}(25-0))=7.4\cdot 10^{-5} m^3[/tex]
And since the mass has not changed, we can now calculate the density at 25 degrees:
[tex]d_{25}=\frac{m}{V_{25}}=\frac{1}{7.4\cdot 10^{-5} m^3}=1.35\cdot 10^4 kg/m^3[/tex]
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Identify and define the four major forms of matter, explain how melting, freezing, boiling,
evaporation, condensation, sublimation and deposition affect them.
There are four forms of matter: Solid, Liquid, gas and Plasma and matter undergoes various state changes termed as melting, freezing, boiling, evaporation, condensation, sublimation and deposition.
Explanation:
Solids
A matter that have a definite shape because of its closely packed molecular structure; are known as Solids. It can be identified as they have a definite shape and cannot flow or float without external forces are applied.
Liquids
These have a an internal molecular structure with comparatively more spaces with one another. Liquids have a property to flow and change shape according to the container it is taken.
Gases
The internal molecular structure of gases has the widest range of space among one another and thus they have a floating property because of least density.
Plasma
A complete ionized gas which has equal amount of positively and negatively charged ions. The best example of plasma is a plasma-ball.
Phase transformation among the four forms of matter
Melting
A matter changing from a solid phase to liquid phase is known as melting. Ex: Ice into water
Freezing
A matter changing from liquid to solid is known as freezing.
Boiling
When the liquid is heated to its boiling point, this gets transformed into the state of gas where liquid's pressure equals to the external pressure.
Evaporation
Once the liquid reached the temperature range above the boiling point ad starts converting into vapours or gaseous state.
Condensation
When the gases changes from the gaseous phase to liquid phase, this is called condensation.
Sublimation
The change of solid into gas is called as sublimation.
Deposition
Deposition refers the thermodynamic process where phase transition takes place as the gas solidifies without passing through the liquid phase. An example: the process of converting water vapour from frozen air directly into ice without initially becoming a liquid.
A charge of 5.67 x 10-18 C is placed 3.5 x 10 m away from another charge of - 3.79 x 10 "C
What is the force of attraction between them?
Answer:
1. 579 x 10 ^-22N
Explanation:
F = kq1q2/r^2
= 9.0 x 10^9 x 5.67 x 10^-18 x 3.79 x 10^-18/ (3.5 x 10^-2)^2
= 1. 579 x 10 ^-22N
The attraction force between two charges is [tex]1.55 \times 10^{-22} \;\rm N[/tex].
Force Between Two ChargesCoulomb's law is used to find out the force of attraction between two charges placed at a certain distance. This law states that, when two point charges are placed at a distance, the force of attraction between them is proportional to the product of both charges and inversely proportional to the square of the distance between them.
[tex]F \propto q_1q_2[/tex] and [tex]F \propto \dfrac{1}{r^2}[/tex]
[tex]F =K \dfrac {q_1q_2}{r^2}[/tex]
Where K is the coulombs constant whose value is 8.988×109 N⋅m2⋅C−2.
Given that charges q1 and q2 are 5.67 x 10-18 C and 3.79 x 10 "C. The distance r is 3.5 x 10 m. The force of attraction is given below.
[tex]F = 8.98\times 10^9 \dfrac {5.67 \times 10^{-18}\times 3.79 \times 10^{-18}}{(3.5\times 10^{-2})^2}[/tex]
[tex]F = 1.55\times 10^{-22} \;\rm N[/tex]
Hence we can conclude that the attraction force between two charges is [tex]1.55 \times 10^{-22} \;\rm N[/tex].
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A load of mass 5kg is raised through a height of 2m. calculate the work done against (g=10mls)
The work done against gravity is 100 J
Explanation:
The work done against gravity in order to lift an object is equal to the change in gravitational potential energy of the object:
[tex]W=mg\Delta h[/tex]
where
m is the mass of the object
g is the acceleration of gravity
[tex]\Delta h[/tex] is the change in height of the object
For the object in this problem, we have:
m = 5 kg
[tex]g=10 m/s^2[/tex]
[tex]\Delta h = 2 m[/tex]
Substituting into the equation,
[tex]W=(5)(10)(2)=100 J[/tex]
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Spiral, elliptical, irregular, and barred spiral are descriptions of different shapes of ________. A. stars B. galaxies C. solar systems D. orbits
Answer:
B. galaxies
Explanation:
Galaxies are clusters of stars, gas and dark matter. They are classified based on the shape they form. There are three main categories: Spiral, elliptical, and irregular. As their named suggests, that is what they look like.
Barred spiral galaxies are a subcategory of spiral galaxies. The nucleus of the galaxy (Center) a bar material is formed and arms branch out from the ends of it.
Some galaxies on the other hand, do not fit the main categories.
Attached is a picture of the common and uncommon categories of galaxies.
A metal rod is 25.000 cm long at 25.0 degrees Celsius. When heated to 102.0
degrees Celsius, it is 25.054 cm long. What is the coefficient of linear expansion
for this metal?
The coefficient of linear expansion for the metal rod is calculated using the formula α = ΔL / (L₀ × ΔT) and is found to be approximately 2.8 x 10⁻⁵ per degree Celsius.
The question you've asked pertains to finding the coefficient of linear expansion for a metal rod that has expanded due to an increase in temperature. The formula to calculate the coefficient of linear expansion (α) is given by:
α = ΔL / (L₀ × ΔT)
Where:
ΔL is the change in length of the rod
L₀ is the original length of the rod
ΔT is the change in temperature
Let's plug in the values we have:
ΔL = 25.054 cm - 25.000 cm = 0.054 cm
L₀ = 25.000 cm (initial length)
ΔT = 102.0°C - 25.0°C = 77.0°C
Before substitution, convert the length in cm to meters (1 cm = 0.01 m):
ΔL = 0.054 cm × 0.01 m/cm = 0.00054 m
L₀ = 25.000 cm × 0.01 m/cm = 0.25 m
Now, calculate α:
α = 0.00054 m / (0.25 m × 77.0°C)
α = 0.00054 m / (19.25 m°C)
α ≈ 2.8 x 10⁻⁵ per degree Celsius
The coefficient of linear expansion for this metal is approximately 2.8 x 10⁻⁵ per degree Celsius.
Using the periodic table and your knowledge of atomic structure. Draw a conclusion about the number of neutrons in Carbon-14 relative to a typical carbon atom.
A)
The same number of neutrons. All carbon atoms have atomic number 6.
B)
The periodic table cannot give you the information needed to answer this question.
C)
It has less neutrons. Its mass number is smaller than the one on the periodic table.
Eliminate
D)
It has more neutrons. Its mass number is larger than the atomic mass number for carbon.
D)
It has more neutrons. Its mass number is larger than the atomic mass number for carbon.
Explanation:
We can see that all the isotopes of Carbon occupies the same slot in the periodic table and thus the same periodic number.
Atomic number of carbon = 6
Periodic Table gives us the information of Atomic number and mass number of atoms of an element.
Atomic number does not give any information about the number of neutrons of an atom. Atomic number of an element is the number of protons in the nucleus of each atom of that element.
Mass number is defined as the total number of protons and neutrons in an atom. Mass number of a typical carbon atom is equal to 12.
Isotopes are variants of a particular chemical element which differ in number of neutrons. Hence, the mass number of different isotopes of the same element varies and gives us information about the number of neutrons present in that atom at the same time.
The mass number of Carbon-14 is equal to 14.
Atomic number of C-14 = Protons in Carbon-14 = 6
Neutrons in Carbon-14 = Mass Number - Atomic Number
Neutrons in C-14 = 14-6
= 8
Whereas the number of neutrons in a typical Carbon-12 atom is equal to 6.
Keywords: Periodic Table, mass number, atomic number, carbon, isotopes
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Carbon-14 is an isotope of carbon that has more neutrons than the typical carbon atom, containing 8 neutrons compared to a normal carbon atom's 6.
Explanation:Using the periodic table and understanding the atomic structure, we can conclude that the Carbon-14 isotope has more neutrons than a typical carbon atom. An atom's atomic number corresponds to the number of protons it has, which for carbon is 6. The number after the hyphen, in this case 14, represents its mass number (sum of protons and neutrons). When we subtract the atomic number from the mass number (14-6), it indicates that a Carbon-14 atom has 8 neutrons, which is 2 more than the typical carbon atom assuming it has 6 neutrons to match its 6 protons.
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How many coulombs of positive charge are there in 47.0 gm of plutonium, given its atomic mass is 244 and that each plutonium atom has 96 protons?
(enter answer to three significant figures and in the exponent form: Example,
1.38e5)
Answer:
1.78×10⁶ CExplanation:
Using the atomic mass of pluonium atoms (244 g/mol), you can calculate the number of atoms in 47.0 g. Then, knowing that each plutonium atom has 96 protons, you calculate the number of protons in the 47.0 g sample. Finally, using the positive charge of one proton, you calculate the total positive charge in the 47.0 g of plutonium.
1. Number of atoms of plutonium in 47.0 g
Number of moles = mass / atomic mass = 47.0 g / 244 = 0.1926 molesNumber of atoms = number of moles × 6.022 × 10²³ atoms/mol Number of atoms = 0.1926 mol × 6.022 × 10²³ atoms/mol = 1.15998×10²³ atoms2. Number of protons
Number of protons = 1.15998×10²³ atoms × 96 protons/atom = 1.11385×10²⁵ protons3. Charge
Charge = charge of one proton × number of protonsCharge = 1.602×10⁻¹⁹ C/proton × 1.11385×10²⁵ protons = 1.78×10⁶CI still walk four blocks north three blocks east for black stuff and then two blocks west where is the students distance and what is the students displacement
1) Distance: 9 blocks
2) Displacement: 4.12 blocks at [tex]76^{\circ}[/tex] north of east
Explanation:
1)
Distance is a scalar quantity that represents the total length of the path covered by a body during its motion, regardless of its direction. It can be calculated by simply adding the length of each part of the path.
In this problem, the motion of the person is:
4 blocks north
3 blocks east
2 blocks west
Therefore, the distance covered is just the sum of the length of each path:
distance = 4 + 3 + 2 = 9 blocks
2)
Displacement is a vector quantity connecting the initial position to the final position of the motion of a body. Since it is a vector, it has both a magnitude and a direction.
The magnitude can be computed by calculating the distance in a straight line between the initial and final position of motion.
In this problem, we have:
- The final position along the north-south direction is 4 blocks north
- The final position along the east-west direction is
(3 east) + (2 west) = 1 block east
Therefore, the magnitude of the displacement is given by Pythagorean's theorem:
[tex]displacement = \sqrt{4^2 + 1^2}=4.12[/tex] blocks
and the direction is given by
[tex]\theta=tan^{-1}(\frac{4}{1})=76^{\circ}[/tex] north of east.
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1. A ball is thrown straight up into the air with an initial speed of 8.0 m/s.
a. How long does it take for the rocket to reach its highest point?
b. What is the maximum height the ball reaches above the ground?
Explanation:
When an object falls freely, it falls due to the influence of gravity and this free falling object is called as acceleration of gravity. The free falling object has an acceleration value of about 9.8 m / s^2 downward on Earth.
The Acceleration of Gravity is denoted by a symbol g.
Solution:
Initial speed = 8.0 m / s.
a. To calculate the time taken, (initial velocity is 8.0 m/s and the final velocity is 0)
T = Velocity / gravity
Time taken to reach highest point t = 8 / 9.8 = 0.816 s.
b. To calculate the height, (initial velocity is 8.0 m/s and the final velocity is 0)
h = square of velocity / (2 * g)
The maximum height the ball reaches h = (8 * 8) / (2 * 9.8)
= 64 / 19.6 = 3.26 m.
The sun’s___and the planet’s___keeps planets moving is___orbits.
The sun’s gravitational attraction and the planet’s inertia keeps planets moving is circular orbits.
Explanation:
The planets in the Solar System move around the Sun in a circular orbit. This motion can be explained as a combination of two effects:
1) The gravitational attraction of the Sun. The Sun exerts a force of gravitational attraction on every planet. This force is directed towards the Sun, and its magnitude is
[tex]F=G\frac{Mm}{r^2}[/tex]
where
G is the gravitational constant
M is the mass of the Sun
m is the mass of the planet
r is the distance between the Sun and the planet
This force acts as centripetal force, continuously "pulling" the planet towards the centre of its circular orbit.
2) The inertia of the planet. In fact, according to Newton's first law, an object in motion at constant velocity will continue moving at its velocity, unless acted upon an external unbalanced force. Therefore, the planet tends to continue its motion in a straight line (tangential to the circular orbit), however it turns in a circle due to the presence of the gravitational attraction of the Sun.
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A 59 kg physics student is riding her 220 kg Harley at 12 m/s when she has a head-on collision with a 2.1 kg pigeon flying the opposite direction at 44m/s. The bird is still on the motorcycle after the collision. How fast is the motorcycle going after the collision?
Answer:
Explanation:
Using conservation of momentum
[tex]m_1=59+220=279kg[/tex]
[tex]m_2=2.1kg[/tex]
[tex]U_1=12m/s[/tex]
[tex]U_2=-44m/s[/tex]
[tex]m_1U_1+m_2U_2=(m_1+m_2)V\\\\\frac{278\times 12-2.1\times 44}{279+2.1}=V\\\\V=11.58m/s[/tex]
The velocity of the motorcycle after collision is 11.6 m/s.
Conservation of linear momentumUsing the principle of conservation of momentum, the total momentum of the system remains constant. Hence, momentum after collision must be equal to momentum before collision.
Thus;
[(55 + 220) Kg * 12 m/s] + 2.1 kg * (-44m/s) = (55 + 220 + 2.1) v
3300 - 92.4 = 277.1v
v = 3300 - 92.4/277.1
v = 11.6 m/s
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In Newton’s third law, the action and reaction forces _____.
A.)cancel each other out
B.)act on the same object
C.)add together to double the force
D.)act on different objects
In Newton's third law, the action and reaction forces D.)act on different objects
Explanation:
Newton's third law of motion states that:
"When an object A exerts a force on object B (action force), then action B exerts an equal and opposite force (reaction force) on object A"
It is important to note from the statement above that the action force and the reaction force always act on different objects. Let's take an example: a man pushing a box. We have:
Action force: the force applied by the man on the box, forwardReaction force: the force applied by the box on the man, backwardAs we can see from this example, the action force is applied on the box, while the reaction force is applied on the man: this means that the two forces do not act on the same object. This implies that whenever we draw the free-body diagram of the forces acting on an object, the action and reaction forces never appear in the same diagram, since they act on different objects.
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Answer:Act on different objects
Explanation:
BRAINLIEST:
How do forecasters predict hurricanes?
Weather forecaster can predict hurricanes through two methods:
by calculating the seasonal probabilitiesby estimating the recent hurricane scenarios.Explanation:
Prediction of Hurricanes
With the help of elementary statistics, meteorologists can predict the intensity of hurricanes coming in specific regions with the approximate wind speeds. The possible trajectory of hurricanes can be drawn as a cone which is updated by estimating the error in the prediction.
Based on the past events of hurricanes and the current climate conditions, a statistical regression equation is formed. There are many many models such as NHC90 and BAM that help meteorologists to predict the intensity of waves and eventually the probability of hurricanes coming in specific regions.
Energy of motion is also known as
a. work
b. potential energy
c. kinetic energy
d. total mechanical energy
Answer:
kinetic energy
Explanation:
before energy is put in motion its being stored as potential energy then becomes kinetic once its released
Kinetic energy is the energy of motion possessed by an object.
Explanation:The energy of motion is known as kinetic energy. It is the energy possessed by an object due to its motion. Kinetic energy can be calculated using the formula:
Kinetic Energy = 1/2 * mass * velocity2
For example, a moving car has kinetic energy because it is in motion.
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Calculate the force of Earth's gravity on 1350kg spacecraft that is 1.28 * 10 ^ 6 * m above Earth surface ( Earth's mass is 6*10^ 24 kgg) .
Answer:
The force of Earth's gravity is 327954 N
Explanation:
Given:
Mass of the space craft = 1350 kg
Mass of the earth = 6*10^ 24
Distance = 1.28 * 10 ^ 6
To Find:
The force of Earth's gravity = ?
Solution:
The force of attraction between a planet and an object kept in space is given by the expression
[tex]F =\frac{GMm}{R^2}[/tex]
where
M is the mass of the earth
m is the mass of the space craft
R is the distance between the earth and the space craft and
G is the gravitational constant
On substituting the values
[tex]F =\frac{(6.67 \times 10^{-11})(6\times10^ {24})(1350)}{(1.28\times 10^6)^2}[/tex]
[tex]F =\frac{(54027\times 10^{13})}{(1.28\times 10^6)^2}[/tex]
[tex]F =\frac{(54027\times 10^{13})}{(1.6384\times 10^{12})}[/tex]
F = 327954 N
BRAINLIST | Why are there some areas of the country where solar power is not the best option?
The reasons for solar power not being best option for some areas of country are mentioned below.
Explanation:
1. The semiconductors used are expensive and need clean environment.
2. Hard to build, install and maintain.
3. Not all areas recieve enough sunlight to make use of solar panels efficiently.
4. Not all areas have sufficient space for installation.
5. Some areas may use cheaper alterantives to generate power.
6. Not helpful on a rainy or foggy day so weather conditions of the area are a major factor.
I NEED HELP ASAP!!!!!!
1. A container has a mass of 36 kg. How much does the container weigh?
Answer:
Explanation:The container weighs 352.8