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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 | I | Question | Answer |
|---|---|---|---|
| 5 | Adisa pulls a 40-N crate up a 5.0-m long inclined plane at a constant velocity. If the plane is inclined at an angle of 37° to the horizontal and there is a constant force of friction of 10 N between the crate and the surface, what is the net change in potential energy of the crate? | 120J | |
| 5 | An 80 000-kg airliner is flying at 900 km/h at a height of 10.0 km. What is its total energy (kinetic + potential) if the total was 0 when the airliner was at rest on the ground? | 10300 MJ | |
| 5 | An amount of work equal to 1.5 J is required to compress the spring in a spring-gun. What is the "launch speed" of a 15-g marble? | 14m/s | |
| 5 | An automobile delivers 30.0 hp to its wheels when moving at a constant speed of 22.0 m/s. What is the resistance force on the automobile at this speed? (1 hp = 746 watts) | 1020N | |
| 5 | As an object is lowered into a deep hole in the surface of the earth, which of the following must be assumed in regard to its potential energy? | decrease | |
| 5 | By how much is the energy stored in a Hooke's law spring increased when its stretch is increased from 8.00 cm to 16.0 cm? | 300% | |
| 5 | I use a rope 2.00 m long to swing a 10.0-kg weight around my head. The tension in the rope is 20.0 N. In half a revolution how much work is done by the rope on the weight? | 0 | |
| 5 | If both mass and velocity of a ball are tripled, the kinetic energy is increased by a factor of: | 27 | |
| 5 | If during a given physical process the only force acting on an object is friction, which of the following must be assumed in regard to the object's kinetic energy? | cannot tell from the information given | |
| 5 | Old Faithful geyser in Yellowstone Park shoots water hourly to a height of 40 m. With what velocity does the water leave the ground? | 28 m/s | |
| 5 | Preston pushes a wheelbarrow weighing 500 N to the top of a 50.0-m ramp, inclined at 20.0° with the horizontal, and leaves it. Tamara accidentally bumps the wheelbarrow. It slides back down the ramp, during which an 80.0-N frictional force acts on it over the 50.0 m. What is the wheelbarrow's kinetic energy at the bottom at of the ramp? (g = 9.8 m/s2) | 4550J | |
| 5 | Rupel pushes a box 5.00 m by applying a 25.0-N horizontal force. What work does she do? | 125 J | |
| 5 | Samantha pushes a 50-N crate up a ramp 25.0 m in length and inclined at 10° with the horizontal. What potential energy change does the crate experience? | 220J | |
| 5 | The area under the force vs. displacement curve represents | work. | |
| 5 | The net force acting on a 12.6-kg object is given by Fx = (20 - x) N, where Fx is in newtons and x is in meters. How much work is done on the object as it moves from x = 0 to x = 10 m? | 150J |
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