Which of the following statements DOES NOT explicitly describe a transfer of energy, A. A ball dropped from a height hits the ground with a high speed.
B. The collisions produced in a nuclear reaction heat up the surroundings.
C. A plane increases its air speed from 150 mi/hr to 200 mi/hr.
D. The electricity from the power socket causes the fan to turn

Option A

Explanation:

A. A ball is dropped from a height and hits the ground with a high speed. As this is a ball, it has elastic energy, so upon impact on the ground the kinetic energy can 1. go into making sound upon impact, or 2. go into making the ball bounce upward again. There may by more possible energy transfers, but this is what should occur in like conditions. Now it didn't mention that the ball transfers energy as such, only that the ball hits the ground at high speed. Thus, this statement does not explicitly describe a transfer of energy.

Just to confirm that this is the correct answer, take a look at the other options. Option B states that the energy from the collision is transferred to heat, not in those exact words but still is given. Option C states that the plane increases speed, most likely transferring energy to the atmosphere, in the form sound. In option d the electricity causes the fan to turn, an explicit statement of the transfer of energy.

Hope that helps!

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.

i don't know that i agree with that but what's the question ?