JEE Mains · Physics · STD 11 - Work,energy,power and collision
- JEE Mains 2024
- Hard
- MCQ
A body is moving unidirectionally under the influence of a constant Power source. Its displacement in time \(t\) is proportional to _______.
Pick an option to check your answer.
Answer & Solution
Correct Answer
(C) \(t^{3 / 2}\)
Step-by-step Solution
Detailed explanation
\(\mathrm{P}=\text { costant } \Rightarrow \mathrm{FV}=\text { constant }\)
\(\Rightarrow \mathrm{m} \frac{\mathrm{dV}}{\mathrm{dt}} \mathrm{V}=\text { constant }\)
\(\int_0^{\mathrm{V}} \mathrm{VdV}=(\mathrm{C}) \int_0^{\mathrm{t}} \mathrm{dt}\)
\(\left(\frac{\mathrm{V}^2}{2}\right)=\mathrm{Ct}\)
\(\mathrm{V} \propto \mathrm{t}^{1 / 2}\)
\(\frac{\mathrm{ds}}{\mathrm{dt}} \propto \mathrm{t}^{1 / 2}\)
\(\int_0^{\mathrm{s}} \mathrm{ds}=\mathrm{K} \int_0^{\mathrm{t}} \mathrm{t}^{1 / 2} \mathrm{dt}\)
\(\mathrm{S}=\mathrm{K} \times \frac{2}{3} \mathrm{t}^{3 / 2}\)
\(\mathrm{~S} \propto \mathrm{t}^{3 / 2}\)
\(\therefore \text { displacement is proportional to }(\mathrm{t})^{3 / 2}\)
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