an object is dropped from the top of a building which is 75 meters high. what's it's velocity before it reaches ground

If you want to change the pitch of a sound, you have to change the

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

Which of the following is the largest disadvantage of about half of the electricity in the united states comes from burning