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प्रश्न
The sign of work done by a force on a body is important to understand. State carefully if the following quantity 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.
उत्तर
The work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket is positive. This is due to the fact that in order to lift a bucket out of a well, the person must exert a force that is equal to the bucket's weight vertically upward. Since the movement is also upward, the angle θ is 0°.
संबंधित प्रश्न
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The sign of work done by a force on a body is important to understand. State carefully if the following quantity is positive or negative:
Work done by gravitational force on a man in lifting a bucket out of a well by means of a rope tied to the bucket.
The sign of work done by a force on a body is important to understand. State carefully if the following quantity is positive or negative:
Work done by friction on a body sliding down an inclined plane.
The sign of work done by a force on a body is important to understand. State carefully if the following quantity is positive or negative:
Work done by the resistive force of air on a vibrating pendulum in bringing it to rest.
