1.在一个重约 20千克 的卫星的起飞过程中,需要多大的力才能使其刚好抵消地球给它的重力加速度?
F=ma=mg
2.你以时速55英里每小时沿一条直路开车.
A. 这时车受任何力的作用吗,列出.
Friction and Air Resistance Gravity and Elasticity
B. 此时车有受到不平衡的合外力吗?
No, a=0
C. 如果车在做一个大的转弯,那么此时车受到不为零的合外力吗?
Yes, 合外力提供圆周运动向心力
打字打得真累,呵呵
physic物理问题英文41.how much force must be applied during liftoff
3个回答
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