You go out for a burger with some friends. At the restaurant the waiter serves you your burger on a plate. You pick up the burger with your hand and lift it to your mouth. This action requires about ________ of work.
1.0.1 joules
2.1 joule
3.10 joules
4.100 joules
[Ques. 2] An older model car accelerates from rest to speed v in 10 seconds. A newer, more powerful sports car accelerates from rest to speed 2v in half the time (5 seconds). What is the ratio of the power of the newer car to that of the older car?
1.0.125
2.1.0
3.4.0
4.8.0
[Ques. 3] You are traveling quickly along a freeway. Your car has kinetic energy. You suddenly skid to a stop because of congestion in traffic. Where is the kinetic energy that your car once had?
1.All of it goes into internal energy in the road.
2.All of it goes into internal energy in the tires.
3.Some of it goes into internal energy of the road and some into internal energy of the tires.
4.Some of it goes into internal energy of the road, some to internal energy of the tires, some to other internal energy, and some is transferred away by mechanical waves.
[Ques. 4] A dart is loaded into a spring-loaded toy dart gun by pushing the spring in by a distance d. For the next loading, the spring is compressed a distance d/2. How much faster does the second dart leave the gun compared with the first?
1.two times as fast
2.the same
3.half as fast
4.one fourth as fast
[Ques. 5] A dart is loaded into a spring-loaded toy dart gun by pushing the spring in by a distance d. For the next loading, the spring is compressed a distance d/2. How much work is required to load the second dart compared to that required to load the first?
1.two times as much
2.the same
3.half as much
4.one-fourth as much
[Ques. 6] The gravitational force exerted by the Earth on the Moon holds the moon in an orbit around the Earth. Let us assume that the orbit is perfectly circular. The work done by this gravitational force during a one week interval in which the moon moves through a displacement in its orbital path is
1.negative.
2.zero.
3.positive.
4.impossible to determine with the information given.
[Ques. 7] You place a box on a smooth and evenly-sanded wooden board. Raise one end of the board so that the angle increases. Eventually, the box starts to slide along the board. If you maintain this angle of the board, the box
1.will move at constant speed along the ramp.
2.will do none of these.
3.will slow down and stop along the ramp.
4.will speed up along the ramp.
[Ques. 8] A heavy box is located in the center of the cargo hold of a train. There are no other boxes or items in the cargo hold and there are no straps holding the box down. The train accelerates along the track in the northward direction. The direction of the friction force exerted by the floor of the cargo hold on the box is
1.upward.
2.none; no friction force exists because the box is not sliding.
3.to the north.
4.to the south.
[Ques. 9] A block of mass m is resting on a ramp making an angle with respect to the horizontal. The coefficient of static friction and the coefficient of kinetic friction for this surface are ms and mk, respectively. If the block does not slide, then the frictional force holding the block must be
[Ques. 10] When you draw the free-body diagram for a single object, you must sketch
1.the forces that act on the single object along with any resulting accelerations that the object experiences.
2.only the forces that act on the object.
3.the forces that act on the object and the forces that the object exerts on other objects.
4.only those forces that the single object exerts on other objects.
Quick Reply
