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 $m s^{- 1} ?$

Open in App

Solution

One watt is the power of an agent which does work at the rate of $1 J s^{- 1}$

$1 k W = 1000 J s^{- 1}$

Total Power $= 150 \times 500 = 7.5 \times 10^{4} W$

Force $= \frac{P o w e r}{v e l o c i t y} = \frac{7.5 \times 10^{4}}{20} = 3.75 \times 10^{3} N$

Force $= 3750 N .$

Suggest Corrections

Similar questions

Q. 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}

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 $20 m s^{- 1}$ ?

Q. 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}

Q. Unit of electric power may also be expressed in

(A) volt ampere
(B) kilowatt hour
(C) watt second

(D) joule second

Q. A rifle of 20 kg mass can fire 4 bullets per second. The mass of each bullet is

35 \times 10^{- 3} k g

and its final velocity is

400 m s^{- 1}

. Then what force must be applied on the rifle so that it does not move backwards while firing the bullets

Join BYJU'S Learning Program

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

One watt is the power of an agent which does work at the rate of 1 Js−11 kW=1000Js−1Total Power =150×500=7.5×104WForce =Powervelocity=7.5×10420=3.75×103NForce=3750N.

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 $m s^{- 1} ?$

One watt is the power of an agent which does work at the rate of $1 J s^{- 1}$

$1 k W = 1000 J s^{- 1}$

Total Power $= 150 \times 500 = 7.5 \times 10^{4} W$

Force $= \frac{P o w e r}{v e l o c i t y} = \frac{7.5 \times 10^{4}}{20} = 3.75 \times 10^{3} N$

Force $= 3750 N .$