Question

Please i really need help! :/

Which action best demonstrates the transformation of mechanical energy to heat energy and sound energy?

A.) stretching a string
B.) squeezing a sponge ball
C.) throwing a ball upwards in air
D.) striking a hammer on a nail

Answer 1

the answer is D, I took the test

Step-by-step explanation:

Answer 2

Answer: D

Step-by-step explanation:
Let us examine the given actions to see which ones generate heat and sound energy from mechanical energy.

A) Stretching a string.
The mechanical stretching creates tension in the string, which is released when the tension is removed. The generation of thermal or sound energy is minimal or negligible.

B) Squeezing a sponge ball
The sponge ball experiences compressive loading. This generates minimal or no heat and sound energy.

C) Throwing a ball upwards in the air
Air friction generates minimal or no heat at low velocities. At low velocities the pressure waves are too small to generate sound.

D) Striking a hammer on a nail.
A tremendous amount of force is applied over a small area to generate very high stresses that are in the plastic zone. A high amount of thermal energy is generated and the localized disturbance of the air generates audible sound.
This is the correct situation.