A48.8-g golf ball is driven from the tee with an initial speed of 44.7 m/s and rises to a height of 25.3 m. (a) neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) what is its speed when it is 5.40 m below its highest point?

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

What happens when a rubber rod is rubbed with a piece of fur?