Awell-thrown ball is caught in a well-padded mitt. if the deceleration of the ball is 2.10×10^{4} 4 m/s^{2} 2 , and 1.85 ms (1 ms =10^{-3} −3 s) elapses from the time the ball first touches the mitt until it stops, what was the initial velocity of the ball?

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?