Physics

Two bodies of masses 1 kg and 5 kg are dropped from the same height in vacuum. Which reaches the ground first?

A hydraulic machine has a velocity ratio of 5. If an effort of 100 N is applied to lift a load of 450 N, what is the efficiency?

The weight of a body at the pole is Wp and at the equator is We. Which is correct?

What is the percentage change in 'g' if the radius of Earth shrinks by 2% (mass constant)?

If a body of mass 'm' is taken to a height 'h' equal to the radius of Earth 'R', the value of 'g' becomes:

A metal cube of side 10 cm and density 8000 kg/m³ is suspended in water. The upthrust is:

Atmospheric pressure is 760 mm of Hg. What is this in Pascals? (Density of Hg = 13600 kg/m³, g = 9.8)

In a lift moving upwards with an acceleration 'a', the effective weight of a person is:

If the distance between two masses is reduced to one-third, the gravitational force becomes:

Which of the following follows the law of floatation?

The ratio of gravitational force on the moon to that on Earth for the same mass is:

Relative density of a substance is 0.8. Will it float or sink in water?

If a body is weightless in space, it means:

A force of 10 N acts on a body of mass 2 kg for 3 seconds. The change in momentum is:

If the mass of a planet is 4 times Earth and its radius is 2 times Earth, 'g' on that planet is:

A person can jump higher on the moon than on Earth because:

If the Earth stops rotating, the value of 'g' at the equator will:

A block of ice is floating in water. When the ice melts, the water level:

The velocity of a falling object in a vacuum depends on:

The center of gravity of a uniform rod is at: