小宇乘坐他爸爸驾驶的一辆功率为24KW的私家车,在一段平直的公路

小宇乘坐他爸爸驾驶的一辆功率为24KW的私家车,在一段平直的公路上匀速行驶了2min,行驶的路程为3.6km,这段时间内汽车受到的牵引力为     N;小宇闻到了一股股清香的气味,是因为车内放置的固体清新剂发生了      (填物态变化)现象.

答案

1)汽车匀速行驶的速度:

v===30m/s

汽车受到的牵引力:

F===800N

2固体清新剂直接由固体变成了气体,所以发生的是升华现象.

故答案为:800;升华.

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