A 2000kg automobile is climbing a hill. Its vertical velocity component is 10m/s (about 22mph). The power output of its engine must be at least

(A) 200W. --- (B) 2000W.
(C) 20,000W. (D) 200,000W.


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A 2000kg automobile is climbing a hill. Its vertical velocity component is 10m/s (about 22mph). The power output of its engine must be at least

(A) 200W. --- No.

Power = energy in 1s = (force)(distance).

Try again.
Questions --- What this question is about
23.1
































A 2000kg automobile is climbing a hill. Its vertical velocity component is 10m/s (about 22mph). The power output of its engine must be at least

(B) 2000W. --- No.

Power = energy in 1s = (force)(distance).

Try again.
Questions --- What this question is about
23.1
































A 2000kg automobile is climbing a hill. Its vertical velocity component is 10m/s (about 22mph). The power output of its engine must be at least

(C) 20,000W. --- No.

Remember W=mg to find the force.

Try again.
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23.1
































A 2000kg automobile is climbing a hill. Its vertical velocity component is 10m/s (about 22mph). The power output of its engine must be at least

(D) 200,000W. --- Yes.

Work in 1s. = (force)(distance)
= (2000kg)(10m/s)(10m) = (2000)(10)(10)J

Check the other answers.
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