What is Hooke's law meaning

Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg

Anika asks eva to roll a basketball and then a bowling ball to her. which requires more force to roll, and why?

Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.