作业帮有没有物理好英语又好的达人帮我看看这些题目?
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/07 09:55:10
有没有物理好英语又好的达人帮我看看这些题目?
1.If the coefficient of kinetic friction between a 28 kg crate and the floor is 0.25,what horizontal force (in N) is required to move the crate at a constant speed across the floor?
2.A person has a reasonable chance of surviving an automobile crash if the deceleration is no more than 30 "g's" (recall that g = 9.8 m/s2).Calculate the force,in N,on a 72 kg person accelerating at this rate.
3.An elevator is travelling upwards at a constant acceleration of 4.7 m/s2.If a 68 kg person in the elevator is standing on a bathroom scale,what would they measure as their apparent weight (in N)?
4.Suppose a circular platform is rotating at a constant rate of 17 rev/min.How far away from the centre would one need to stand in order to have an radial acceleration of 6.3 m/s2?Express your answer in cm.
5.Suppose the Canadian Space Agency wished to place a 773 kg satellite in a circular orbit around the moon such that the satellite takes 17.4 hours for one complete revolution around the moon.How far away from the surface of the moon (in km) would the satellite be located?N.B.Mass of Moon = 7.35 x 1022 kg,Radius of Moon = 1.74 x 103 km.
顺便帮我看看这题好吗?
How is the quantity called 'impulse' calculated?
a.from the change in momentum?
b.from the change in acceleration?
c.the change in the kinetic energy?
答案只需要准确数字,不需要单位,补充问题说一下选哪个就好
1.If the coefficient of kinetic friction between a 28 kg crate and the floor is 0.25,what horizontal force (in N) is required to move the crate at a constant speed across the floor?
2.A person has a reasonable chance of surviving an automobile crash if the deceleration is no more than 30 "g's" (recall that g = 9.8 m/s2).Calculate the force,in N,on a 72 kg person accelerating at this rate.
3.An elevator is travelling upwards at a constant acceleration of 4.7 m/s2.If a 68 kg person in the elevator is standing on a bathroom scale,what would they measure as their apparent weight (in N)?
4.Suppose a circular platform is rotating at a constant rate of 17 rev/min.How far away from the centre would one need to stand in order to have an radial acceleration of 6.3 m/s2?Express your answer in cm.
5.Suppose the Canadian Space Agency wished to place a 773 kg satellite in a circular orbit around the moon such that the satellite takes 17.4 hours for one complete revolution around the moon.How far away from the surface of the moon (in km) would the satellite be located?N.B.Mass of Moon = 7.35 x 1022 kg,Radius of Moon = 1.74 x 103 km.
顺便帮我看看这题好吗?
How is the quantity called 'impulse' calculated?
a.from the change in momentum?
b.from the change in acceleration?
c.the change in the kinetic energy?
答案只需要准确数字,不需要单位,补充问题说一下选哪个就好
1. 68.6 N
2. 21168 N
3. 986 N
4. 198 CM
5. 90 km
好多年不看了 都忘记了 不保证结果正确
2. 21168 N
3. 986 N
4. 198 CM
5. 90 km
好多年不看了 都忘记了 不保证结果正确