谢谢大虾了T-T1.A box is given a push so that it slides across the

谢谢大虾了T-T
1.A box is given a push so that it slides across the floor.How far will it go,in m,given that the coefficient of kinetic friction is 0.21 and the push imparts an initial speed of 3.9 m/s?
2.What is the average force,in N,exerted by a shot-putter on a 7 kg shot if,during the throw,the shot starts at rest,is moved through a distance of 2.5 m,and is released with a speed of 11 m/s?
Assume that you are only dealing with motion along a straight line (i.e.you do not need to worry about motion in both the x- and y-directions).
3.An elevator is travelling upwards at a constant acceleration of 3.7 m/s2.If a 71 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 23 rev/min.How far away from the centre would one need to stand in order to have an radial acceleration of 9.8 m/s2?Express your answer in cm.
5.Assuming that the Earth's orbit around the sun is circular,suppose that the mass of the Sun were to increase by a factor of 2.72.By what factor would the Earth's distance from the Sun also need to increase in order to keep its orbital period the same?
答案只要具体数据就好,不用翻译,偶看得懂题就是不会做

1.3.7 m
2.171 N
3.958.5 N
4.170 cm
5.1.4
这次最后一题比较简单,前四题个上次一样只是数据变了,一般情况能保证全对.