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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
C
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Question
Answer
6
A moderate force will break an egg. However, an egg dropped on the road usually breaks, while one dropped on the grass usually doesn't break. This is because for the egg dropped on the grass:the time interval for stopping is greater.
6
In a system with two moving objects, when a collision occurs between the objects:the total momentum is always conserved.
3
A boat moves through the water in a river at a speed of 8 m/s relative to the water. The boat makes a trip downstream and then makes a return trip upstream to the original starting place. Which trip takes longer?the upstream trip
2
A v vs. t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 5 s the acceleration of the ball is zero. We know that at t = 5 sthe velocity of the ball is not changing.
9
As ice floats in water, about 10% of the ice floats above the surface of the water. If we float some ice in a glass of water, what will happen to the water level as the ice melts?The water level will remain unchanged.
8
Consider the use of the terms "rotation" and "revolution". In physics:the words have different meaning.
6
Kaitlin uses a bat to hit a thrown baseball. She knocks the ball back in the direction from which it came in a partially inelastic collision. The bat, which is heavier than the baseball, continues to move in the same direction after the hit as Kaitlin "follows through." Is the ball moving faster before or after it was hit?There is insufficient information to answer this problem.
8
A 4.2-kg mass is placed at (3.0, 4.0) m. Where can an 8.4-kg mass be placed so that the moment of inertia about the z-axis is zero?There is no position giving this result.
10
The zeroth law of thermodynamics pertains to what relational condition that may exist between two systems?thermal equilibrium
5
Two blocks are released from the top of a building. One falls straight down while the other slides down a smooth ramp. If all friction is ignored, which one is moving faster when it reaches the bottom?They both will have the same speed.
4
The statement by Newton that "for every action there is an opposite but equal reaction" is regarded as which of his laws of motion?Third
1
If the displacement of an object, x, is related to velocity, v, according to the relation x = Av, the constant, A, has the dimension of which of the following?time
14
Consider a vibrating string that makes a sound wave that moves through the air. As the guitar string moves up and down, the air molecules that are a certain horizontal distance from the string will move: 1) up and down. 2) toward and away from the guitar string. 3) back and forth along the direction of the length of the string. 4) in circles around the guitar string. 5) none of the above.toward and away from the guitar string.
10
Which best describes a system made up of ice, water and steam existing together?triple point
14
If the intensity of a sound is increased by a factor of 100, how is the decibel level changed? The new decibel level will be: 1) two units greater. 2) double the old one. 3) ten times greater. 4) twenty units greater. 5) ten units greater.twenty units greater.
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