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Engine of a car of mass 1500 kg, keeps car moving with constant velocity 5m/s. If frictional force is 1000 N, power of engin is ________ (A) 5 kW (B) 7.5 kW (C) 15 kW (D) 75 kW |
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Answer» Power = 5kWExplanation:mass of car = 1500 kgvelocity = 5 m/sfrictional force = -1000 ( SINCE it APPLIES in opposite direction of MOTION)The force required to be produced by the engine has to be equal such that the net force acting on the car is 0 Nthus force of engine = 1000 NWork = Force × displacementWork = 1000 N × 5 m ( in 1 sec)Work = 5 kJPower = Work / timePower = 5kJ/ 1sPower = 5kWHOPE IT HELPS U! AND PLS MARK IT THE BRAINLIEST ANSWER AND DO FOLLOW ME FOR MORE SUCH ANSWERS!! :) |
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