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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 |
|---|---|---|---|
| 4 | A worker pulls a 200-N packing crate at constant velocity across a rough floor by exerting a force F = 55.0 N at an angle of 35.0° above the horizontal. What is the coefficient of kinetic friction of the floor? | 0.267 | |
| 4 | An airplane of mass 1.2*10^4 kg tows a glider of mass 0.6*10^4 kg. The airplane propellers provide a net forward thrust of 3.6*10^4 N. What is the glider's acceleration? | 2m/s^2 | |
| 4 | An astronaut applies a force of 500 N to an asteroid, and it accelerates at 7.00 m/s2. What is the asteroid's mass? | 71kg | |
| 4 | An automobile of mass 2 000 kg moving at 30 m/s is braked suddenly with a constant braking force of 10 000 N. How far does the car travel before stopping? | 90m | |
| 4 | An elevator weighing 20 000 N is supported by a steel cable. What is the tension in the cable when the elevator is being accelerated upward at a rate of 3.00 m/s2? (g = 9.80 m/s2) | 26100N | |
| 4 | An Olympic skier moving at 20.0 m/s down a 30.0° slope encounters a region of wet snow, of coefficient of friction μk = 0.740. How far down the slope does she go before stopping? | 145m | |
| 4 | As a 3.0-kg bucket is being lowered into a 10-m-deep well, starting from the top, the tension in the rope is 9.8 N. The acceleration of the bucket will be: | 6.5 m/s^2 | |
| 4 | As a basketball player starts to jump for a rebound, he begins to move upward faster and faster until he leaves the floor. During this time that he is in contact with the floor, the force of the floor on his shoes is: | bigger than his weight. | |
| 4 | As a car goes up a hill, there is a force of friction between the road and the tires rolling on the road. The maximum force of friction is equal to: | The normal force of the road times the coefficient of static friction. | |
| 4 | As a car moves forward on a level road at constant velocity, the net force acting on the tires is: | zero | |
| 4 | As a car skids with its wheels locked trying to stop on a road covered with ice and snow, the force of friction between the icy road and the tires will usually be: | less than the normal force of the road times the coefficient of static friction. | |
| 4 | As I slide a box at constant speed up a frictionless slope, pulling parallel to the slope, the tension in the rope will be: | less than the weight of the box. | |
| 4 | Dana uses a rope to pull a box that weighs 300 N across a level surface with constant velocity. The rope makes an angle of 30° above the horizontal and the tension in the rope is 100 N. What is the coefficient of friction? | 0.35 | |
| 4 | Doug hits a hockey puck, giving it an initial velocity of 6.0 m/s. If the coefficient of kinetic friction between ice and puck is 0.050, how far will the puck slide before stopping? | 37m | |
| 4 | Find the tension in an elevator cable if the 1 000-kg elevator is descending with an acceleration of 1.8 m/s2, downward. | 8000N |
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