Statement A: Work is said to be done when a camel is carrying a load on its back Statement B: Work is said to be done when a sailboat is moving due to wind energy Which of the above statement is true?

# Class IX

## Two persons P and Q do same amount of work. The person Q does the work in tp seconds and person Q in….

Two persons P and Q do same amount of work. The person Q does the work in tp seconds and person Q in tq seconds. Find the ratio of power delivered by them.

## The angle between force and displacement is 2 Q. for what value of Q is work done zero?….

The angle between force and displacement is 2 Q. for what value of Q is work done zero?

## A body of mass 20kg climbs up 20 steps of the stairs in 20 seconds. If each step is 20cm high. What ….

A body of mass 20kg climbs up 20 steps of the stairs in 20 seconds. If each step is 20cm high. What is the power used in climbing the stairs (g=10m/s2)

## What is the force required to lift a block of mass 2m?….

What is the force required to lift a block of mass 2m?

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## What is the work done to be done to increase the velocity of a car from 30km h−1 to 60 kmh−1 if ….

What is the work done to be done to increase the velocity of a car from 30km h−1 to 60 kmh−1 if the mass of the car is 1500 kg?

## Calculate the time taken by a 150 w bulb of consuming 3000 joule of energy…..

Calculate the time taken by a 150 w bulb of consuming 3000 joule of energy.

## A machine does 2000 joule of work in 400 seconds. What is the power of machine?….

A machine does 2000 joule of work in 400 seconds. What is the power of machine?

## 9800 joule of energy was spent to raise a mass of 50kg, the mass was raised to a height of (ta….

9800 joule of energy was spent to raise a mass of 50kg, the mass was raised to a height of (take g = 9.8 m/s2)

## 1 meV (mega electron volt) is equal to….

1 meV (mega electron volt) is equal to

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