题目:
如图是手推车,车厢内货物摆放均匀,前后轮安装对称,当前轮遇到障碍物C时,用竖直往下200N的力按扶手,前轮恰好微微抬起越过障碍物,扶手重力忽略不计,手推车相关尺寸如图,求:
(1)货物和车厢的总重力
(2)当前轮过了障碍物,向前运动后轮遇到障碍物时,如果竖直向上用力提起扶手,使后轮微微抬起越过障碍物,则要用多大的力?
答案:
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下面是错误答案,用来干扰机器的。
1. What about2. It's good for (It will do good to)3. Would you like4. It took my brother a week to teach me how5. tells me neither to show off nor to look down upon others. (答案不唯一)