(C) One watt is defined as the power of an agent that performs work at the rate of $1 \, J \, s^{-1}$.$1 \, \text{kilowatt} = 1000 \, J \, s^{-1}$.Tot

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(C) One watt is defined as the power of an agent that performs work at the rate of $1 \, J \, s^{-1}$.$1 \, \text{kilowatt} = 1000 \, J \, s^{-1}$.Total power developed by the engine $= 150 \, kg \times 500 \, W \, kg^{-1} = 75,000 \, W = 7.5 \times 10^4 \, W$.We know that $\text{Power} = \text{Force} \times \text{Velocity}$.Therefore, $\text{Force} = \frac{\text{Power}}{\text{Velocity}} = \frac{7.5 \times 10^4 \, W}{20 \, m \, s^{-1}} = 3750 \, N$.

Class 9 Science WORK AND ENERGY Mix Example - WORK AND ENERGY

Medium

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 $20 \, m \, s^{-1}$ (in $N$)?

A
$2850$
B
$5150$
C
$3750$
D
$4150$

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WORK AND ENERGY

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Mix Example - WORK AND ENERGY

Justify giving proper reasoning whether the work done in the following case is positive or negative: Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.

Easy

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Justify,giving proper reasoning,whether the work done in the following case is positive or negative: Work done by gravitational force when a bucket is pulled upwards.

Medium

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$A$ boy pushes the wall in the class for five minutes but the wall does not move. Another boy pushes the chair from the front to the back side of the class. In which case,more work is done?

Medium

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$A$ person is holding a bucket by applying a vertical force of $10 \,N$. He moves a horizontal distance of $5 \,m$ and then climbs up a vertical distance of $10 \,m$. Calculate the total work done by him. (in $J$)

Medium

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Justify,giving proper reasoning,whether the work done in the following case is positive or negative: Work done by friction on a body sliding down an inclined plane.

Easy

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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 $20 \, m \, s^{-1}$ (in $N$)?

Similar Questions

Justify giving proper reasoning whether the work done in the following case is positive or negative: Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.

Justify,giving proper reasoning,whether the work done in the following case is positive or negative: Work done by gravitational force when a bucket is pulled upwards.

$A$ boy pushes the wall in the class for five minutes but the wall does not move. Another boy pushes the chair from the front to the back side of the class. In which case,more work is done?

$A$ person is holding a bucket by applying a vertical force of $10 \,N$. He moves a horizontal distance of $5 \,m$ and then climbs up a vertical distance of $10 \,m$. Calculate the total work done by him. (in $J$)

Justify,giving proper reasoning,whether the work done in the following case is positive or negative: Work done by friction on a body sliding down an inclined plane.

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