In which of the following situations is friction not useful?
The diagram above illustrates the trajectory of a fired missile from point P at 250 ms-1
If the missile point Q after 40 s, calculate the distance |PQ|
The effective potential energy, E, of a lunar satellite of mass, m, moving in an. elliptical orbit around the moon of mass, m, is given by
E = \(\frac{K^{2}}{2m_{1}r^{2}} - \frac{Gm_{1}m_{2}}{r}\) where r is the distance of the satellite from the mooń and G is the universal gravitational constant of dimensions, M\(^{-1}\)L\(^{3}\)T\(^{2}\).
Ďetermine the dimensions of the angular momentum, K, of the satellite using dimensional analysis.
A 50 N force is applied to the free end of a spiral spring of force constant, 100 N m\(^{-1}\). Calculate the work done by the force to stretch the spring.
