PHY108 CUNY Community College Chapter 5 Circular Motion & Gravity Paper Chapter 5 Circular motion, the planets and gravity

A ball is traveling at a constant speed of 5 m/s in a circle with a radius of 0.8 m. What is the centripetal acceleration of the ball? What’s its direction?

A car with a mass of 1200 kg is moving around a curve with a radius of 40 m at a constant speed of 20 m/s.

a) What is the centripetal acceleration of the car?

b) What is the magnitude of the force required to produce this centripetal acceleration?

Two 100-kg persons are separated by a distance of 1 m. using Newton’s law of gravitation, find the magnitude of the attractive gravitational force exerted by one person to the other.

Two masses are attracted by a gravitational force of 0.36 N. What will the force of attraction be if the distance between the two masses is tripled?

Does an astronaut have the same weight in different planets? Explain why.

Why uniform circular motion has acceleration if it has the same speed everywhere? Chapter 5 Circular motion, the planets and gravity

1. A ball is traveling at a constant speed of 5 m/s in a circle with a

radius of 0.8 m. What is the centripetal acceleration of the

ball? What’s its direction?

2. A car with a mass of 1200 kg is moving around a curve with a

radius of 40 m at a constant speed of 20 m/s.

a) What is the centripetal acceleration of the car?

b) What is the magnitude of the force required to produce this

centripetal acceleration?

3. Two 100-kg persons are separated by a distance of 1 m. using

Newton’s law of gravitation, find the magnitude of the

attractive gravitational force exerted by one person to the

other.

4.

Two masses are attracted by a gravitational force of 0.36 N.

What will the force of attraction be if the distance between the

two masses is tripled?

5.

Does an astronaut have the same weight in different planets?

Explain why.

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