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Physics page 1
| Question | Answer |
|---|---|
| 6. A block at point P is released from rest at height h1 and slides along the frictionless track shown above. At point Q, which is at height h2, its speed is | √2g(h1+h2) |
| 5. An escalator is used to move 20 people (60 kg each) per minute from the first floor of a department store to the second floor, 5 m above. The minimum power required to accomplish this is approximately: | 1000 W |
| 4. At time t = 0, a 2.0-kg particle has a velocity in m/s of 4i – 3j. Three seconds later, its velocity in m/s is 2i + 3j. During this time the net work done on the particle was: | -12 J |
| 3. When a certain rubber band is stretched a distance x, it exerts a restoring force F= -(ax+bx2), where a and b are constants. The work done by an external force opposing this restoring force in stretching this rubber band from x = 0 to x = L is: | aL2 + bL3 2 3 |
| For a block of mass m to slide without friction up the rise of height h as shown above, it must have a minimum initial speed Vo of | √2gh |
| 1. A 60-kg skier skies from rest down a 20 m long slope that is at a 30-degree angle with the horizontal. At the bottom of the slope, she is moving at 10 m/s. How much work did friction do on the skier? | -3000 J |
Created by:
summerjoysanders