Which of the following elements has the highest atomic mass? 1. helium: 2 protons and 2 neutrons 2. nitrogen: 7 protons and 7 neutrons 3. oxygen: 8 protons and 8 neutrons 4. hydrogen: 1 proton and no neutrons

An athlete is holding 24 lb of weights at a height of 6 inches above the stack as shown. to lower the weights, she applies a constant force of 5 lb to the handle. determine the velocity of the weights immediately before they hit the stack.

Does heating a metal wire increase or decrease its electrical resistance? why?

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