A mass oscillates with a period of 2.8 s on the end of a spring that has a spring constant of 75 N/m. What is the magnitude of the mass?
A tennis player smashes a serve so that the racquet is in contact with the ball for 0.055 s, giving it an impulse of 2.5 N ⋅ s. What average force was applied during this time? Assume that the vertical motion of the ball can be ignored. If the ball's mass is 0.0...