Question Library

If the weight of an object on the Earth's surface is 2.5 x 10\(^3\)N, what is its weight on the moon's surface if the gravitational force of the moon is one-sixth of the Earth's(g = 10m/s\(^{-2}\))

The gravitational force between two masses, P and Q, is 10N, find the new value of the force if both masses are doubled

What is the escape velocity of a body on the surface of the Earth of radius R if the gravitational constant is G and the mass of the Earth is M? (Neglect energy losses to the surroundings)

1a. Explain what is meant by the acceleration of free fall due to gravity, g. b. State two reasons why g varies on the surface of the Earth. c. A stone is projected upwards at an angle of 30° to the horizontal from the top of a tower of height 100 m and it hits the ground at a point Q. If the initial velocity of projection is 100 ms\(^{-1}\), calculate the: i. maximum height of the stone above the ground (neglect air resistance and take g as 10 ms\(^{-2}\)) ii. time it takes to reach this height iii. time of flight. iv. horizontal distance from the foot of the tower to the point Q (neglect air resistance and take g as 10 ms\(^{-2}\))

The gravitational force between two objects is 10N, what is the new value of the force if the distance between them is halved?

The gravitational force between two objects masses 10\(^{24}\)kg and 10\(^{27}\)kg is 6.67N. Calculate the distance between them [ G = 6.6 x 10\(^{-11}\)Nm\(^2\)kg\(^{-2}\) ]

The gravitational pull on the moon is \(\frac{1}{6}\) that of the earth. If a body weighs 6.0 N on the moon, what will be the weight on the earth?

Which of the sketched graphs above illustrates the correct variation of the gravitational force, Fg between two objects and the distance, d, between the centre

A stone and a feather are dropped from the same height above the earth surface. Ignoring air resistance, which of the following is correct?

An object is weighed at different locations on the Earth. What will be the right observation?

The value of x, y and z respectively in the expression M\(^x\) L\(^y\)T \(^z\) for the universal gravitational constant G are?

If the radius of the Earth is 6.4 x 10\(^6\)m, the escape velocity of a satellite from the Earth is? [g = 10 ms\(^-2\)]

What is the escape velocity of a satellite launched from the earth’s surface? (Take g as 10ms\(^{-2}\) and the radius of the earth as 6.4 × 10\(^6\)m)