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A motor car is moving with a constant sp...

A motor car is moving with a constant speed . Is the car engine doing any work?

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The engine of a motor car is rotating at a constant speed of 150 rpm. Acquiring acceleration suddenly it gains a velocity of 3000 rpm in 3 s. What is the angular acceleration of the engine?

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Knowledge Check

  • A car is moving with a constant speed of 60 km. h^(-1) on a straight road. Looking at the rear view mirror, the driver finds that the car following him is at a distance of 100 m and is approaching with a speed of 5 km. h^(-1) . In order of keep track of the car in the rear the driver begins to glance alternatively at the rear and side mirror of his car after every 2s till the other car overtakes. If the two cars were maintaining their speeds, which of the following statement is correct ?

    A
    the speed of the car in the rear is 65 km . `h^(-1)`
    B
    in the side mirror, the car in the rear would appear to approach with a speed of 5 km. `h^(-1)` to the driver of the leading car
    C
    in the rear view mirror, the speed of the apporaching car would apperar to decrease as the distance between the cars decreases
    D
    in the side mirror, the speed of the approaching car would appear to increase as their distance between the cars decreases

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    The engine of a motor car is rotating at a constant speed of 150 rpm. Acquiring acceleration suddenly it gains a velocity of 3000 rpm in 3 s. What will be the angular displacement of it in 3 s?

    A motor boat is moving at a steady speed of 36.km*h^(-1) . If the water resistance to the motion of boat is 4000N, calculate the power of the engine.

    A person is carrying a bucket of water, and is in a lift moving up with uniform velocity . Is the person doing any work on the bucket of water ? Will the energy of the bucket and water remain constant ?

    A conveyor belt, run by a motor, is moving at a constant speed of 5 m *s^(-1) . If 5 kg of sand is sprinkled per second on the belt, then what extra power should the motor supply to the belt?

    A car of mass M moves upward with a constant speed v along an inclined road making an angle theta with the horizontal . If mu be the coefficient of friction between the road and the wheel of the car, show that the power of the engine of the car is P=vMg(sin theta +mucos theta) .

    A car of mass M moves upward with a constant speed v along an.. inclined road making an angle theta with the horizontal. If mu be the coefficient of friction between the road and the wheel of the car, show that the power of the engine of the car is P= vMg(sin theta + mu cos theta ).

    The distance between two places is 200 km. The time taken by moter car to travel from one place to another is more by 2 hrs than the time taken by a zeep car.If the speed of the motor car is 5 kms/hr less than the speed of the zeep car, then find the speed of the motor car.

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