Circular motion and gravitation

Question 1 of 10

Astronauts in orbit feel weightless because there is no gravity there.

Question 2 of 10

The centripetal acceleration of a body moving at 2 m/s in a circle of radius 5 m is ___ m/s².

Question 3 of 10

Escape velocity from the Earth's surface is about

Question 4 of 10

Describe two uses of artificial satellites and explain what is meant by a geostationary orbit.

Question 5 of 10

Communication satellites are often geostationary.

Question 6 of 10

The centripetal acceleration of a body moving at 3 m/s in a circle of radius 1 m is ___ m/s².

Question 7 of 10

A geostationary satellite has a period of

Question 8 of 10

A stone of mass 0.2 kg is whirled in a horizontal circle of radius 0.5 m at 4 revolutions per second. Calculate (a) its angular velocity, (b) its linear speed, (c) the centripetal acceleration, (d) the tension in the string.

Question 9 of 10

Distinguish between mass and weight. A man has a mass of 72 kg. Find his weight on the Earth (g = 10 N/kg) and on the Moon (g = 1.6 N/kg). Explain why his mass is the same in both places.

Question 10 of 10

Centripetal acceleration is given by