14
Question
A motor drives a body along a straight line with a constant force. The power P developed by the motor must vary with time t as
A motor drives a body along a straight line with a constant force. The power P developed by the motor must vary with time t as
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Solution
The correct option is A
F = constant
∴ a = constant or v = at
Now P = F.v = F.at or P ∝ t (as F and a both are constant). Hence, P-t graph is a straight line passing through origin.
F = constant
∴ a = constant or v = at
Now P = F.v = F.at or P ∝ t (as F and a both are constant). Hence, P-t graph is a straight line passing through origin.
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