A trainer is training a horse for the Kentucky Derby. The trainer knows the horse needs to have an opening acceleration of 10 m/s^2. If the horse has a mass of 450 kilograms, how much force will the horse need to produce to reach the needed acceleration? 2500 N

4500 N

3500 N

3000 N

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e