pg. 1 Fundamentals of Physics Exam 3 Latest 2024 Actual Exam Questions with 100% Correct Verified Answers/ Graded A+
Clouds and fog are caused by ________.
- evaporating liquid water
- burning too many fossil fuels
- condensing water vapor
- vapor deposition in the atmosphere - Correct Answer - c
In a pressure cooker, the food is cooked faster than in a normal pot because ________.
- the increased pressure breaks down the food molecules faster
- the water boils at a higher temperature
- the lower pressure breaks down the food molecules faster
- the water boils at a lower temperature - Correct Answer - b
In a standard refrigerator, it is the ________ that is most responsible for the transfer of heat.
- latent heat of refrigeration
- latent heat of fusion
- latent heat of vaporization
- latent heat of sublimation - Correct Answer - c
If you have two differently-sized spheres of metal and they have the same mass, then
________.
- The smaller sphere is denser 1 / 3
pg. 2
- Their densities are proportional to their sizes
- The larger sphere is denser
- They have the same density as well - Correct Answer - a
An elastic material is one that___.
- Keeps its new shape once deformed
- Bends at least somewhat before breaking
- Is relatively easy to deform.
- Returns to its original shape after being deformed. - Correct Answer - d
When a gas is compressed, ________.
- its internal energy will decrease
- its internal energy will increase
- the gas will expand
- internal energy will flow out of the gas - Correct Answer - b
If heat flows into a system, ________.
- the system will be able to do more work
- the system will be able to do less work
- the work capacity of the gas is not affected - Correct Answer - a
a cannon recoils while firing a cannonball. The speed of the cannon's recoil is relatively small because the ________.
- momentum is mainly concentrated in the cannonball
- force against the cannon is smaller than against the ball
- momentum of the cannon is smaller
- cannon has much more mass than the cannonball - Correct Answer - d
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pg. 3 A moving 5000-kg freight car collides with a 10,000-kg freight car at rest. They couple upon collision and move at 2 m/s. What was the initial speed of the 5000-kg car?
- 9 m/s
- 6 m/s
- 5 m/s
- 15 m/s - Correct Answer - b
Truck A comes to a stop from 20 m/s by crashing into a haystack. Truck B comes to a stop from 20 m/s by crashing into a brick wall. Both trucks have the same mass.Compared to truck A, the impulse on truck B during the collision is ________.
- larger
- more concentrated
- the same
- smaller - Correct Answer - c
Automobile safety devices like padded dashboards and airbags work by ________.
- decrease average impulse by distributing it over a larger distance
- decreasing average force by extending the time of the collision
- decreasing average force by shortening the time of the collision
- decreasing the change in momentum involved - Correct Answer - b
You drop a blob of clay and a golf ball of equal mass onto a hard surface. The clay sticks to the surface, while the golf ball bounces. Compared to the impulse on the clay, the impulse on the golf ball is ________.
- smaller
- zero because the forces cancel out
- larger
- the same - Correct Answer - c
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