Achild throws a penny straight down into a wishing well. the penny's initial speed is 2 m/s. if the penny takes 3 seconds to hit the water, how deep is the well?

Ametal ball with a mass of 0.028 kg is dropped from rest at a height of 1.0 meters above the ground. assuming the energy in the ball is conserved, how much kinetic energy will the ball have when it is 0.5 meters above the ground?

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.

Select the three ways that the parallel-plate capacitor differs from a car battery.