Units 2.3 and 2.4 Work, Power, Energy and Momentum

Quiz
•
Physics
•
11th - 12th Grade
•
Hard
張權深 張權深
Used 4+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
An object of mass m is sliding down a ramp at constant speed. During the motion it travels a distance x along the ramp and falls through a vertical distance h. The coefficient of dynamic friction between the ramp and the object is μ. What is the total energy transferred into thermal energy when the object travels distance x?
mgh
mgx
μmgh
μmgx
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
An object has a weight of 6.10 × 102 N. What is the change in gravitational potential energy of the object when it moves through 8.0 m vertically?
5 kJ
4.9 kJ
4.88 kJ
4.880 kJ
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A boat with an output engine power of 15 kW moves through water at a speed of 10 m s-1. What is the resistive force acting on the boat?
0.15 kN
0.75 kN
1.5 kN
150 kN
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
An astronaut is moving at a constant velocity in the absence of a gravitational field when he throws a tool away from him.
What is the effect of throwing the tool on the total kinetic energy of the astronaut and the tool and the total momentum of the astronaut and the tool?C
A
B
C
D
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A compressed spring is used to launch an object along a horizontal frictionless surface. When the spring is compressed through a distance x and released, the object leaves the spring at speed v. What is the distance through which the spring must be compressed for the object to leave the spring at ?
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A ball of mass m collides with a wall and bounces back in a straight line. The ball loses 75 % of the initial energy during the collision. The speed before the collision is v.
What is the magnitude of the impulse on the ball by the wall?
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
An object falls from rest from a height h close to the surface of the Moon. The Moon has no atmosphere.
When the object has fallen to height
above the surface, what is
?
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