[填空题]
A 65-kg hiker climbs to thcdv1 crrya q ;:7ysfc4* fu;m-e top of a 3700-m-high mounta* bdi m:coja0t4(yn aeg*j52lin. The climb is made in 5.0 h starting at an elevati*a*gj(m j5: dbt2ie4 y onacl0on 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
