Answer:
20C is equal to 68 F.
the second law of thermodynamics
Answer:
The Second Law of Thermodynamics states that "in all energy exchanges, if no energy enters or leaves the system, the potential energy of the state will always be less than that of the initial state." This is also commonly referred to as entropy.
In the diagram, the liquid is vaporizing at which point?
gas
Answer:
Point c
Explanation:
The diagram shows that the liquid changes to a gas a the point c hope this helped :)
The moon does not have atmosphere. Why?
Answer: It doesn't because it's not that big.
Explanation:
Answer:
One characteristic of the moon of Earth is that it basically has no atmosphere. The Earth has an atmosphere rich in Nitrogen and Oxygen but on the moon the surface is directly exposed to outer space. There are three reasons why the moon has no atmosphere. The primary reason is because the moon is too small. Compared to the Earth, the moon is about 1/4th the size. This reduces the amount of gravity on the moon. Strong gravity is needed to hold an atmosphere into place. With weak gravity, gases that are emitted from the surface quickly are lost to outer space. Another reason is because the moon does not currently experience plate tectonics and geologic upwelling. Plate tectonics allows for a recycling of crust and convergence and divergence of plates occurs and this leads to volcanoes and gases escaping at the boundaries. The moon is said to be geologically dead. There are currently no significant processes that allow for abundant gases to supply an atmosphere. The early moon may have had an atmosphere when it was geologically active but the crust of the moon is currently “frozen” into place and thus there are very little gases being emitted as compared to Earth. Another reason is because the moon is relatively close to the sun. This reason is tied closely to the moon having weak gravity. The solar wind from the sun helps strip away a weak atmosphere. Earth and Venus do not suffer the same fate since the gravity is high enough to hold the atmosphere in place. There are other moons in the outer solar system that are better able to hold an atmosphere due to being further away from the sun among other reasons.
Explanation:
In scientific notation 8700 is written
Answer:
8.7 x 10^3 is the correct answer.
Answer:
8.7 x 10^3
I have no explanation, I just know that it is written as this
a crowbar of 2 meter is used to lift an object of 800N if the effort arm is 160cm , calculste the effort applied
Answer:
200 N
Explanation:
The crowbar is 2 meter, or 200 cm. The effort arm is 160 cm, so the moment arm of the object is 40 cm.
(800 N) (40 cm) = F (160 cm)
F = 200 N
Which motions are the components of projectile motion?
Projectile motion contains both horizontal and vertical motion.
Answer:Contains both Horizontal and Vertical Motions
Explanation:
What does a weather balloon do? Check all that apply.
warns about severe weather
enables forecasts seven to 10 days in advance
measures conditions in the upper atmosphere
collects data that predicts changes in the atmosphere
uses mathematical equations to show what will happen if conditions change
Answer:
Answers are, A, B, C, and D
Answer:
its actually a,c & d :) on edg
What is the best reason for a student to remove a dangling bracelet when heating test tubes of acidic solutions in a hot water
bath in a chemistry lab?
to avoid reactions of the metal with gases in the lab
to reduce the risk of bums from heat conducted through the metal
to minimize the chance the bracelet pulling over a test tube, causing a spill
to prevent misreading the temperature of the bath on a thermometer
Answer:
c
Explanation:
this equestion is about the safety
Answer: To minimize the chance the bracelet pulling over a test tube, causing a spill.
Explanation:
A chemistry lab is a laboratory where the potential hazards related to the chemicals may result if safety precautions are neglected. The chances of the cause of chemical splash, burns from chemicals or fire hazards can possibly happen in a chemistry lab. The use of ornaments should be avoided in the chemical lab. Proper safety measures are to be taken to protect the body from chemical hazards by wearing close toed shoes, lab coat and gloves.
A dangling bracelet worn during the heating process is likely to spill off the acid solutions by pulling over a test tube. The test tube neck may get caught in the dangling bracelet. The test tube may collapse and break. Thus the dangling bracelet should be avoided during the process of heating.
What happens to light waves from a star as the star moves away from Earth?
The astronomer Edwin Powell Hubble observed several celestial bodies, and when obtaining the spectra of distant galaxies he observed the spectral lines were displaced towards the red (red shift), whereas the nearby galaxies showed a spectrum displaced to the blue.
From there, Hubble deduced that the farther the galaxy is, the more redshifted it is in its spectrum. The same happens with the stars and this phenomenom is known as the Doppler effect.
This phenomenon refers to the change in a wave perceived frequency (or wavelength=color) when the emitter of the waves, and the receiver (or observer in the case of light) move relative to each other. For example, as a star moves away from the Earth, its espectrum turns towards the red.
Answer:
they shift towards red
Explanation:
A P E X
Study the following reaction carefully. What classification should this reaction have?
4Al + 3O2 2Al2O3
synthesis
decomposition
single replacement
double displacement
Answer:
Synthesis reaction
Explanation:
Synthesis reaction: two or more compounds combine to form one.
A + B → C
Decomposition reaction: one compound forms two or more.
C → A + B
Single replacement reaction: an element in one compound is replaced with another element.
AB + C → AC + B
Double replacement reaction: elements in two compounds replace each other.
AB + CD → AC + BD
What is the electrical power when the current is 25 amps and the voltage is 10 volts?
25 watts
250 watts
2.5 watts
2,500 watts
Answer:
B
250 watts.
Explanation:
The formula for wattage is
P = E * I
E = 10 volts.
I = 25 amps
P = 10 * 25
P = 250 Watts.
Answer:250
Explanation:
Electric power=IV
=25*10
=250Watts
The
force is the sum of all the forces that act upon an object.
the forces acting on an object is the net force or resultant force. ... Force is a vector and hence has both a direction and magnitude. For example, gravitational force (on earth) acts in downward direction and has a magnitude equal to mass of the object and acceleration due to gravity.
Answer:
Explanation:
The net force or resultant force is sum of all the forces act upon an object. As force is a vector quantity it has both magnitude as well as direction. so net force is calculated by keeping direction of application in mind such as friction force is always acts in the direction opposite to the motion of object and gravitational force always acts downwards.
How much heat is needed to raise the temperature of 8grams of water by 19°C
Answer:
635.36J
Explanation:
The formulae to apply in this question is;
q=m*c*ΔФ where q is the heat needed, m is mass,c is specific heat capacity and ΔФ is change in temperatures
Given that;
m=8 g
ΔФ= 19°C - 0°C= 19°C
c=4.18J/g.°C
Substitute values
q= 8×4.18×19 = 635.36J
Choose all of the terms that are appropriate for a situation that produces
work.
A. The momentum is greater than the force.
O
B. An object maintains its state of motion.
O
c. A force acts
D. The object moves.
SUBMIT
Answer:
-The object moves
-A force acts
Explanation:
(apex)
Two friends are having a conversation. Anna says a satellite in orbit is in freefall because the satellite keeps falling toward Earth. Tom says a satellite in orbit is not in freefall because the acceleration due to gravity is not 9.80 m/2 . Who do you agree with and why?
Answer:
Anna is correct.
Explanation:
Anna is right as a satellite is in free fall because it keeps falling toward Earth, meaning that gravity is the only force acting on it. Tom is incorrect because an object does not have to accelerate at a certain speed to be considered to be in free fall. As long as gravity is the only force acting upon the object, it is considered to be in free fall.
From the conversation anna had with tom about the satellite in orbit, we can say that;
Anna is right because falling to the earth means being subject to only gravity which means a freefall.
In physics, freefall is defined as a scenario whereby when an object is in motion, the only force acting on it is that due to gravity. This means that it is basically weightless and has no normal force acting on it
Now, a satellite in orbit means that the satellite is accelerating towards the earth and as a result it would have an orbiting rate equal to the acceleration due to gravity. Thus, only force of gravity is acting on it.
Now, Anna said that a satellite in orbit is in free fall because it keeps falling toward Earth. From our earlier definition, she is correct because falling to the earth means being subject to only gravity which means a freefall.
Whereas, Tom is incorrect because he claims the object is not in freefall.
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A marble, a bowling ball, a basketball, and a baseball are rolling across the floor at 10 m/s. Which one has the greatest
kinetic energy?
the marble
the bowling ball
the basketball
the baseball
Answer:
The bowling ball
Explanation:
The kinetic energy of an object is given by:
[tex]K=\frac{1}{2}mv^2[/tex]
where
m is the mass of the object
v is its speed
In the problem, all the balls have same speed v: so their difference in kinetic energy will depend on their mass only.
We don't know the exact masses of the balls, however we can assume that the bowling ball has the largest mass among them: therefore, the bowling ball will also have the greatest kinetic energy.
Which of the following changes will result in a stronger electromagnet?
A. Using fewer coils of wire
B. Using a higher voltage
C. Using a shorter nail
D. Using a longer wire
Answer:
B and D
Explanation:
The higher the voltage, the more current flowing and the better the magnetic field. Using a longer wire will result in more electric force around the nail, making it stronger.
The stronger electromagnet can be achieved using a high voltage than the actual.
Answer: Option B
Explanation:
The strength of the electromagnet depends upon the factors such as the current or voltage, then the number of coils present or the iron core. These all are directly influencing factors in respect to proportionality.
Out of the options given, using fewer coils will weaken the electromagnet. Using shorter nail will again weaken. Shorter wire would increase the strength. Therefore, the best suitable change is the use of higher voltage.
1. This image shows the various forces acting on a block of rock situated on a rock slope. What does arrow 4 represent?
A. Shear strength
B. Gravitational force
C. Normal force
D. Shear force
Answer:
B. Gravitational force
Explanation:
The gravitational force of an object (also called weight) is given by
[tex]F=mg[/tex]
where m is the mass of the object and g is the acceleration of gravity, and it always points in the downward direction.
In this problem, the arrow labelled with 4 is the only force pointing downward: therefore, it must be the gravitational force.
The other arrows represent:
1 --> component of the gravitational force parallel to the plane
2 --> force of friction
3 --> component of the gravitational force perpendicular to the plane
A ramp is often used to raise an object. If 80 joules of energy are needed to lift an object to a platform but 100 joules are
used in rolling the object up the ramp, what percent of energy was wastec in the form of heat due to friction?
Answer:
20
Explanation:
Answer:
20 % of energy is wasted
Explanation:
If 100 joules of energy are used when 80 joules was needed, then 100 - 80 = 20 joules were wasted. Given that 100 joules are proportional to 100 % of energy used, then 20 joules is proportional to x %, therefore:
20 J/100 J = x%/100%
x = 20%
Select the three natural sciences.
Answer:
biology, chemistry, and physics
Answer: Biology, chemistry and physics
Explanation: The natural sciences include;
physics; this is the study of physical quantity of matter such as length, time etc.
Chemistry; this is the study of the chemical composition of matter and other living and non living things. The chemical properties may include
Biology is the study of life. It is the Study of life existence.
The velocity of sound wave in air at 35°c is 353m/s, calculate the velocity of sound at 46°c
What is one of Kepler's laws of planetary motion?
The Kepler laws of planetary motion are:
1) The planets revolve around the Sun following elliptical orbits, in which the Sun occupies one of the two focii
2) A line segment connecting the Sun with the center of each planet sweeps out equal areas in equal intervals of time --> this means that the speed of the planet changes according to its distance from the Sun: the closer to the Sun, the faster the planet
3) The square of the orbital period of the planets is proportional to the cube of the semi-major axis of the orbit. In formula
[tex]\frac{T^2}{r^3} = const.[/tex]
and the constant in the equation has the same value for every planet orbiting around the Sun.
Kepler's first law of planetary motion states that every planet orbits the Sun in an elliptical shape, with the Sun at one of the focal points of the ellipse. This law helps to calculate planetary positions with increased precision within the Copernican system.
Explanation:One of Kepler's laws of planetary motion is his first law, which states that each planet moves around the Sun in an orbit that is an ellipse, with the Sun located at one focus of the ellipse. This concept emerged based on the careful analysis of precise data collected, revolving around the positions in the sky of all the known planets and the Moon. The elliptical orbits described in Kepler's first law is a fundamental rule which improved the calculation of planetary positions with great precision within the framework of the Copernican system.
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A heat engine is a device that uses
to produce useful work.
A heat engine is a device that uses the transfer of heat energy to perform useful work, and it can be found in car engines and steam turbines.
Explanation:A heat engine is a device that uses the transfer of heat energy to perform useful work. It extracts heat from a source and converts it into mechanical work that can be used for various applications. For example, a steam engine in an old-style train converts the heat energy from burning coal into the work needed to drive the train forward.
One of the important principles that govern the operation of heat engines is the second law of thermodynamics. This law sets a limit on the maximum percentage of the extracted heat energy that can be efficiently converted into work.
In summary, a heat engine is a device that utilizes heat transfer to produce useful work, such as car engines and steam turbines.
Final answer:
A heat engine is a device that converts heat into mechanical work, adhering to the principles of thermodynamics with limitations imposed by its thermal efficiency and the second law of thermodynamics.
Explanation:
A heat engine is a device designed to convert heat energy into mechanical work. This conversion is one of the fundamental processes in thermodynamics and is utilized in various applications. For instance, car engines, which are types of heat engines, use the heat generated from burning fuel to propel a vehicle. In another example, steam turbines that generate electricity use steam produced by heat to rotate blades and generate electricity. Such engines operate on cycles, where they repeatedly return to their original state by the end of each cycle. The thermal efficiency of a heat engine is determined by comparing the work output to the heat energy input; higher efficiency means more work is done with less wasted energy.
The operation of heat engines is governed by the laws of thermodynamics. The first law, also known as the conservation of energy, is applied to heat engines to ensure that energy is conserved throughout the process of converting heat to work. The second law of thermodynamics defines the limits of efficiency for these conversions by stating that not all absorbed heat can be transformed into mechanical work, as some energy is always lost, often as waste heat.
calculate the frequency of photon 434E-9 and speed of light 3E8m/s
Answer:
f = 6.912 E14 Hz
Explanation:
The speed of the wave is defined as
speed = wavelength*frequency
the frequency of the photon is defined as
f = speed / wavelength
f = 3 E8 m/s / 434 E-9 m
f = 6.912 E14 Hz
Answer:
Frequency, [tex]f=6.91\times 10^{14}\ Hz[/tex]
Explanation:
It is given that,
Wavelength, [tex]\lambda=434\times 10^{-9}\ m[/tex]
Speed of light, [tex]c=3\times 10^8\ m/s[/tex]
The frequency of photon can be calculated using following relation as :
[tex]c=f\times \lambda[/tex]
[tex]f=\dfrac{c}{\lambda}[/tex]
[tex]f=\dfrac{3\times 10^8\ m/s}{434\times 10^{-9}}[/tex]
[tex]f=6.91\times 10^{14}\ Hz[/tex]
So, the frequency of the photon is [tex]f=6.91\times 10^{14}\ Hz[/tex]. Hence, this is the required solution.
In all trials, the magnitude of the final velocity for G1 + G2 was less than the magnitude of any initial velocity. As mass increased, what happened to the velocity?
The velocity decreased.
The velocity increased.
The velocity of G1 + G2 could not be measured.
The velocity was not affected by the mass increase.
Answer: The Velocity Decreased
Explanation: e2020 answer
The magnitude of the final velocity for G1 + G2 will be less than any initial velocity because ; The velocity decreased ( A )
when the mass of an object on motion is increased by the addition of additional weight on the object, the velocity of the object on motion will start to decrease ( i.e. deceleration )
Therefore the magnitude of the final velocity for G1 + G2 will be less than the magnitude of their initial velocities as they experience an increase in mass, respectively.
Hence we can conclude that The magnitude of the final velocity for G1 + G2 will be less than any initial velocity because ; The velocity decreased.
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6. An article, which costs Rs. 850 is sold at a profit of 6%.
What is the selling Price ? -
a) Rs.900 b) Rs. 901 c) Rs. 890 d) Rs. 905
Answer:
b) Rs.901 is the selling price
Explanation:
selling price = cost price+profit percentage/100 x cost price
cost price = 850
profit percentage = 6%
selling price = 850+6/100 x 850 = 901
soln 2
if 100 % = 850
therefore what about 106% = ?
106 x 805/100 = 901
ans = 901
if you need any clarification or more explanation pls do mention on the comment section.i would like to help more
Hope this helps and if it does mark as branliest answer thx
More damage is done and more life is endangered in a head-on collision of two cars, each traveling at 30 mph, than in a
car crashing into a brick wall at 30 mph because:
The relative velocity of the head-on collision is the product of the two velocities.
The relative velocity of the collision of the wall is absorbed by the wall.
The relative velocities are opposite of each other and therefore have a net sum of zero.
The relative velocities of the head-on collision are the sum of the two velocities.
Answer:
More damage is done and more life is endangered in a head-on collision of two cars, each traveling at 30 mph, than in a car crashing into a brick wall at 30 mph because the relative velocities of the head-on collision are the sum of the two velocities.
Explanation:
Car crashing to a brick wall at 30 mph is less dangerous than two cars travelling in opposite direction at 30 mph each.
This is because, for one car, the other is at a relative speed of 30+30 = 60 mph.
Mountain ranges that form close to a subduction zone are likely to experience
A. reduced elevation. B. decreased mass. C. volcanic activity. D. isostatic equilibrium.
Answer:
the correct answer choice woud be C. hope this helps :)
Explanation: Mountain ranges that form close to a subduction zone are likely to experience volcanic activity.
Answer:
C) Volcanic activity.
Explanation:
When an oceanic plate is subducted ( brought underneath) under a continental plate, the sediments of seafloor which is rich in water and carbon dioxide are also brought under the plate .These elements act as flux reducing the melting point of magma which comes out in the form of volcanic eruption.
please tell me the answer
Answer:
The magnets are repealing from each other is because the poles are the same on the magnets so they are pushing away from each other.
Explanation:
Magnets can either attract or repel each other. A permanent magnet is an object that produces a magnetic field around itself. It is this field that enables them to stick to each other and to some types of metal. Specifically, they stick to ferromagnetic materials like iron and things that contain iron, such as steel
Explanation:
A magnet is defined as a bar magnet that produces a magnetic field which attracts or repel other objects.
A magnet has both a north pole and a south pole.
As like charges repel each other and opposite charges attract each other. Similarly, like poles repel each other and opposite poles attract each other.
So, when south pole of a magnet comes in contact with north pole of another magnet then they will attract each other.
As the given image shows that magnets are away from each other this means that they are repelling each other.
how to calculate displacement?
-- Take a straight ruler.
-- Lay it down with the 'zero' mark at the start point.
-- Rotate it around the start point until the end point is also touching the edge of the ruler.
-- From the marks on the ruler, read the straight-line distance from the start point to the end point.
-- Without moving the ruler, observe and write down the DIRECTION from the start point to the end point.
-- The Displacement is the straight-line distance and direction from the start point to the end point.
Displacement is the change in an object's position. It can be calculated simply as the difference between final and initial position. If using a velocity-time graph, calculate the area under the graph.
Explanation:Displacement, in the context of physics, refers to an object's overall change in position. It is a vector quantity, meaning it has both magnitude (distance) and direction. The simple way to calculate displacement is by using the formula Ax = x₁ - x₀, where x₁ is the final position and x₀ is the initial position.
If you are dealing with a velocity-time graph, displacement can be found by calculating the area under the graph. For example, if your graph shows a rectangle and a triangle under the line, you will calculate the area of both and add them up to get the displacement.
In more complex situations that involve multiple displacements in different directions, you can draw displacement vectors on a scale (like 1 cm of vector length equals 1 m in the problem) and add them up to find the total displacement. Remember, direction is important in displacement calculation.
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