Uniform Circular Motion - SG

A rock is thrown straight up from the earth's surface. Which one of the following statements concerning the net force acting on the rock at the top of its path is true?

It is equal to the weight of the rock.

The magnitude of the gravitational force is related to the distance between two objects. Which of the following choices gives the correct relationship between the distance r and the gravitational force?

1/r2

A truck is traveling with a constant speed of 15 m/s. When the truck follows a curve in the road, its centripetal acceleration is 4.0 m/s2. What is the radius of the curve?

56 m

Complete the following statement: Near the surface of the earth, the weight of an object

Is the gravitational force of the earth on the object.

A steel ball is tied to the end of a string and swung in a vertical circle at constant speed. Complete the following statement: The direction of the instantaneous velocity of the ball is always

Tangent to the circle

A bicycle racer is traveling at constant speed v around a circular track. The centripetal acceleration of the bicycle is ac. What happens to the centripetal acceleration of the bicycle if the speed is double to 2v?

The centripetal acceleration increases to 4ac

A satellite orbit the Earth in uniform Circular Motion. What is the direction of the centripetal acceleration of the satellite?

The centripetal acceleration vector paints radially inward toward the Earth

Two objects with masses m and M are separated by a distance d. If the separation d remains fixed and the masses of the objects are increased to the values 3m and 3M respectively, how does the gravitational force between them change?

The force will be nine times as great.

Two objects with masses m and M are separated by a distance d. If the distance between the objects is increased to 4d, how does the gravitational force between them change?

The force will be one-sixteenth as great.

When using the term "uniform circular motion," what do we mean by the term "uniform?"

The motion of the object is at a constant speed.

If an object is moving in uniform circular motion, its period is given by which one of the following quantities?

The time interval for the object to make one revolution

Which one of the following statements concerning the two "gravitational constants" G, the universal gravitational constant, and g the magnitude of the acceleration due to gravity is true?

The value of G is the same everywhere in the universe, but the value of g is not.

A motorcycle travels at a constant speed around a Circular track. Which one of the following statements about this motorcycle is true?

The velocity of the car is changing

For an object in uniform circular motion, which of the following statements is false?

The velocity of the object is constant.

A steel ball is tied to the end of a string and swung in a vertical circle at constant speed. Complete the following statement: The direction of the acceleration of the ball is always

Toward the center of the circle