试题与答案

一辆汽车,总重为1.2×104N,四个轮胎与地面接触的总面积为0.12m2,该车

题型:计算题

题目:

一辆汽车,总重为1.2×104N,四个轮胎与地面接触的总面积为0.12m2,该车在平直公路上匀速行驶1h,消耗汽油10L,汽油完全燃烧放出的热量有30%转化为机械能。(汽油的热值为4.6 ×107J/kg,密度为0.7 ×103kg/m3,g=10N/kg)求:

(1)该车静止在水平路面上时,对路面的压强是多少?

(2)10L汽油完全燃烧放出的热量是多少?

(3)这段时间内该汽车发动机的功率是多少千瓦?(功率的计算结果保留小数点后一位)

答案:

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