Multiple choice (3 points each): Choose one and only one answer\" l. A truck is

Question

Multiple choice (3 points each): Choose one and only one answer" l. A truck is driving down the road at 30 m/s. The net force of friction on the truck (friction with the ground and drag) is-3000 N. How much power must the truck's engine generate for the truck to continue driving at 30 m/s? a) o w b) 100 W c) 3000 w d) 90,000 w e) There is insufficient information to know. 2. You are riding a blke up a hill. To generate the most positive torque, you should push down on the pedal when it is at which location? (You are pedaling counter-clockwise a) Top b) Back c) Front d) Bottom e) All work equally well 3. A NASA astronaut lands on a mysterious planet that is the mass of the Earth but the radius of the Moon (which is only 25% that of Earth). On this planet the force of gravity is: a) The same as on the Moon b) Between that on the Earth and on the Moon c) The same as on the Earth d) A little bit higher than on the Earth e) Much higher than on the Earth

Explanation / Answer

1. POWER = FORCE * VELOCITY. So, Answer is (d)90000W

2. Answer is (c) FRONT

3. (e) Much higher than on earth. As g proportional to r^2.

4. Answer is (c)

5. Answer is (b).

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