Define watt. Express $k W$ (kilowatt) in terms of $J / s e c$ . A $150 k g$ car engine develops $500 W$ for each $k g$ . What force does it exert in moving the car at a speed of $20 m s^{- 1}$ ?

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Solution

Step 1: Given data
Mass of car, $m = 150 k g$
Power for each $k g = 500 x 150 = 7500 W$
Velocity, $v = 20 m s^{- 1}$
Step 2: Calculating the force exerted
$P o w e r = F o r c e x v e l o c i t y \Rightarrow F o r c e = \frac{P o w e r}{v e l o c i t y} \Rightarrow F = \frac{7500 W}{20 m s^{- 1}} \Rightarrow F = 350 N$
Hence, the magnitude of force exerted is $350 N$ .

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Define watt. Express kW (kilowatt) in terms of J/sec. A 150kg car engine develops 500W for each kg. What force does it exert in moving the car at a speed of 20ms-1?

Step 1: Given dataMass of car, m=150kg Power for each kg=500x150=7500WVelocity, v=20ms-1Step 2: Calculating the force exerted Power=Forcexvelocity⇒Force=Powervelocity⇒F=7500W20ms-1⇒F=350NHence, the magnitude of force exerted is 350N.

Define watt. Express $k W$ (kilowatt) in terms of $J / s e c$ . A $150 k g$ car engine develops $500 W$ for each $k g$ . What force does it exert in moving the car at a speed of $20 m s^{- 1}$ ?