[填空题]
A 65-kg hiker climbs to the top of a 3700-m-high movrt78ow-oo/ v+lcu0d )ef1rhfcw.pj-u/ 8 nluntai (e/n8 ;i jcmbwjd v(.m6xnnv0n. The climb is made in 5.0 h star njm ((/ m8veb0xi djn.w;n6cvting at an elevation of 2300 m. Calculate
(a) the work done by the hiker against gravity,
(b) the average power output in watts and in horsepower, W hp
(c) assuming the body is 15% efficient, what rate of energy input was required. hp
