A neutron of mass m moving with velocity v collides head-on and elastically with a stationary nucleus of mass M. Show that the velocity of the nucleus after the collision, U, is given by U= 2mV/(m+M)

Modify the equation fδt=δ (mv) to find the force of friction.

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

Simple machines can a. increase force only b. decrease force only c. increase or decrease force