Which are the examples of potential kinetic energy? Select your answer from the options given below:
(i) Water that is behind a dam
(ii) Radio signals
(iii) An airplane idling on the runway
(iv) A satellite before it is launched
(v) A coiled spring
(vi) Heat harnessed from the oceans
Options:
(i), (iii), (iv) and (v)
To determine the correct examples of potential kinetic energy, let's analyze each option:
- Water that is behind a dam (i): This is an example of potential energy, specifically gravitational potential energy. The water has stored energy due to its elevated position.
- Radio signals (ii): These are a form of electromagnetic energy and do not represent potential or kinetic energy directly. Hence, radio signals are not an example of potential kinetic energy.
- An airplane idling on the runway (iii): When an airplane is stationary but can move at any time, it has potential energy stored as it is capable of moving (kinetic energy), representing the potential for kinetic energy.
- A satellite before it is launched (iv): The satellite, while stationary on Earth, has potential energy. Once it launches, it converts some of this to kinetic energy.
- A coiled spring (v): This is a classic example of potential energy. The spring can release this energy, converting it to kinetic energy when it is uncoiled.
- Heat harnessed from the oceans (vi): This is more closely related to thermal energy rather than potential or kinetic energy.
Based on this analysis, the correct examples of potential kinetic energy are:
- (i) Water that is behind a dam
- (iii) An airplane idling on the runway
- (iv) A satellite before it is launched
- (v) A coiled spring
Thus, the correct answer is: (i), (iii), (iv), and (v).
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