Question

question
which of the following situations represents released energy:
(1) a dart shot out of a dart gun,
(2) a compressed spring in a dart gun, or
(3) active transport of a substance across a cellular membrane?

Explanation:

• For (1): When a dart is shot out of a dart - gun, the elastic potential energy stored in the compressed spring (in the dart - gun) is converted into the kinetic energy of the dart, releasing energy.
• For (2): A compressed spring in a dart - gun has elastic potential energy stored in it. It has not released energy yet; rather, it has the potential to release energy when it expands.
• For (3): Active transport of a substance across a cellular membrane requires energy (usually in the form of ATP hydrolysis), which means energy is consumed, not released.

Answer:

D. 1 only