Editor Staff asked 1 year ago
The force required to tow a vehicle at constant velocity is directly proportional to the magnitude of velocity raised to the first power. It requires 1000 W to tow with a velocity of 10 m/s. How much power is required to tow at a velocity of 8 m/s?
(a) 320 W
(b) 640 W
(c) 160 W
(d) 80 W
This question was posed to me during a job interview.
I would like to ask this question from Power in chapter Work, Energy and Power of Physics – Class 11
Select the correct answer from above options
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Editor Staff answered 1 year ago
Correct option is (b) 640 W
To elaborate: Since force is directly proportional to velocity, the power required will be directly proportional to the square of the velocity.
Power = Force x Velocity
Hence, power is a multiple of 8^2 and an integer such that;
1000/10^2 = P/8^2
P = 640 W.
