Assume aerodynamic drag force on a car is proportional to its speed. If power output from engine is

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5.Work, Energy, Power and Collision

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Assume the aerodynamic drag force on a car is proportional to its speed. If the power output from the engine is doubled, then the maximum speed of the car.

A

is unchanged

B

increases by a factor of $\sqrt 2 $

C

is also doubled

D

increases by a factor of four.

Solution

$\because F \propto V$

$\because P=V^{2} \frac{d m}{d t} \quad \quad \sqrt{P} \propto V$

Standard 11

Physics

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