Question 27
Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of $20 m s^{- 1}$ ?

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Solution

One watt is the power of an agent which does work at the rate of $1 J s^{- 1}$
Total Power $= 150 \times 500 = 7.5 \times 10^{4} W$
$P o w e r = F o r c e \times v e l o c i t y$
$F o r c e = \frac{P o w e r}{v e l o c i t y} = \frac{7.5 \times 10^{4}}{20} = 3.75 \times 10^{3} N$
$F o r c e = 3750 N$

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Question 27 Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of 20 ms−1?

One watt is the power of an agent which does work at the rate of 1 Js−1 Total Power =150×500=7.5×104W Power=Force×velocity Force=Powervelocity=7.5×10420=3.75×103 N Force=3750 N

Question 27
Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of $20 m s^{- 1}$ ?