A 20kg block is pushed up against a spring. The spring has a spring constant of 623.75 N/m. It is displaced 8m from the springs equilibrium point. The block is released from rest. It travels up the 100 m tall, frictionless half-circle. The block makes it to the top of the half circle with some velocity to spare. Required:
What is the block – table coefficient of kinetic friction?

The substances that are necessary for producing of certain hormones and that store and transport vitamins

Two carts, one of mass 2m and one of mass m, approach each other with the same speed, v. when the carts collide, they hook together. assume that positive momentum is to the right. which graph best represents the momentum of both carts over time, before and after the collision?

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?