As a pendulum swings back and forth, its total energy is 16 j. what is its kinetic energy at 3/4 its maximum height? a. 4 b. 5

So we can do the ratio ke/KE = (TE - mgh)/mgH where h = 3/4 H is given. Solve for ke, the kinetic energy when h = 3/4 H.

ke = KE (TE - mg 3/4 H)/mgH = KE (TE/mgH - mg 3/4 H/mgH) = KE (1 - 3/4) = KE/4. Thus the kinetic energy when at h = 3/4 H is 1/4 the KE at the bottom or 1/4 TE = 4 J. ANS.

c.is a substance that requires a small amount of energy per gram to raise its temperature; has strong cohesive forces between molecules.

explanation:

a colorless, transparent, odorless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.

. west