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【简答题】
一辆质量为5t的大型货车，允许满载货物的质量为20 t．货车前后共有10个轮子，满载货物时每个轮子与地面的接触面积为0.04 m 2 ，此车的功率为300 kW，车满载货物并以20 m/s的速度在公路上匀速行驶1000 m。请你提出与本题有3个物理问题并计算出来，照示例进行设问和解答（示例除外，但在示例中求出的数据可在自己的解答中使用。g取10 N/kg） 示例 问题：满载时货物的总重力是多少？ 解：G 总 = G 车 + G 货 =（m 车 + m 货 ）g=（5×10 3 kg +2× 10 4 kg)×10N/kg=2.5×10 5 N。
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