试题与答案

发动机额定输出功率为80kW的汽车,在平直公路上行驶的最大速度是40m/s。汽车

题型:计算题

题目:

发动机额定输出功率为80kW的汽车,在平直公路上行驶的最大速度是40m/s。汽车的质量为2.0×103kg。如果汽车从静止开始做匀加速直线运动,加速度的大小是2m/s2,发动机的输出功率达到额定功率之后保持不变,运动过程中阻力不变.求:

(1)汽车受到的阻力多大?

(2)汽车维持匀加速运动的时间是多少?

(3)5s末、15s末汽车的瞬时功率各多大?

答案:

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参考答案:声学性能、空气动力性能、结构机械性能、外观要求、价格要求

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题型:阅读理解

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题型:问答题

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