The answer is false, pumice is a rock formed from the smoggy powder that shoots out of a volcano called pumicite.
The proportion of the total energy input that is put to use in a solar cell is known as its efficiency, so this is a true statement.
<h3>What is a Solar cell?</h3>
A solar cell, also known as a photovoltaic cell, is a type of electronic device that uses the photovoltaic effect to convert light energy directly into electricity.
<h3>What is Energy?</h3>
Energy is the ability to perform work. It could exist in several different forms, such as potential, kinetic, thermal, electrical, chemical, radioactive, etc. Additionally, there is heat and work, that is energy being transferred from one body to another. It is always assigned based on its nature once it has been transmitted. Thus, heat transmitted may manifest as thermal energy while work performed may result in mechanical energy.
Hence, the proportion of the total energy input that is put to use in a solar cell is known as its efficiency, so this is a true statement.
To know more about energy, check out:
brainly.com/question/13881533
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Answer:
Explanation:
Given:
- change in stiffness constant of the spring on replacing the original springs,
- mass of the car,
- initial length of the original car-spring before compression,
- final length of the original car-spring after compression,
So, weight of the car:
<u>Now the spring constant of original spring:</u>
(since 4 springs are in parallel)
<u>So the stiffness constant of the new springs:</u>
<u>Now the height lowered:</u>
(since 4 springs are in parallel)
All except C, feelings are not physical.
