At a carnival, you can try to ring a bell by striking a target with a 8.90-kg hammer. in response, a 0.390-kg metal piece is sent upward toward the bell, which is 5.05 m above. suppose that 26.0% of the hammer's kinetic energy is used to do the work of sending the metal piece upward. how fast must the hammer be moving when it strikes the target so that the bell just barely rings?

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

The energy equivalent of the rest mass of an electron is