PLEASE HELP A forensic investigator notes that an 8g lead bullet melted completely upon impact with a doorframe. Assuming the bullet was fired at room temperature (~20 OC), what would be the minimum muzzle velocity of the gun (in other words, how fast was the bullet traveling)?

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s.what is the wavelength?

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.