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Questions and Answers
When a body is moved on a rough horizontal plane with uniform velocity, the work done by friction is?
When a body is moved on a rough horizontal plane with uniform velocity, the work done by friction is?
- Negative
- Depends on the coefficient of friction
- Positive
- Zero (correct)
The work done by gravitational force when a man lifts a bucket out of a well is?
The work done by gravitational force when a man lifts a bucket out of a well is?
- Depends on the depth of the well
- Positive
- Zero
- Negative (correct)
The work done by an applied force on a body moving on a rough horizontal plane with uniform velocity is?
The work done by an applied force on a body moving on a rough horizontal plane with uniform velocity is?
- Positive
- Zero (correct)
- Depends on the mass of the body
- Negative
When a man lifts a bucket out of a well by means of a rope tied to the bucket, the work done by the man is?
When a man lifts a bucket out of a well by means of a rope tied to the bucket, the work done by the man is?
In the case of a body sliding down an inclined plane, the work done by friction is?
In the case of a body sliding down an inclined plane, the work done by friction is?
Why is the blood pressure greater at the feet than at the brain in humans?
Why is the blood pressure greater at the feet than at the brain in humans?
Why does the atmospheric pressure at the height of about 6km decrease to nearly half of its value at sea level?
Why does the atmospheric pressure at the height of about 6km decrease to nearly half of its value at sea level?
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