• A. $\frac{\omega^2r}{g}$

• B. $\frac{g}{\omega^2r}$

• C. $\frac{\omega r^2}{g}$

• $\frac{g}{\omega r^2}$

An object of mass m makes n revolutions per second around a circle of radius r at a constant speed. What is the kinetic energy of the object?

• A. 0

• B. $\frac{1}{2}\pi^2mn^2r^2$

• C. $2\pi^2mn^2r^2$

• D. $4\pi^2mn^2r^2$

A satellite travels around the Earth in a circular orbit. What is true about the forces acting in this situation?

• A. The resultant force is the same direction as the satellite’s acceleration.

• B. The gravitational force acting on the satellite is negligible.

• C. There is no resultant force on the satellite relative to the Earth.

• D. The satellite does not exert any force on the Earth.

• A.

• B.

• C.

• D.

• A. 1/2

• B. 1/4

• C. 2

• D. 4

• A. T/4

• B. T/2

• C. 3T/4

• D. T

• A.

• B.

• C.

• D.

• A.

• B.

• C.

• D.

• A. 4/13 m

• B. 2/5 m

• C. 3/5 m

• D. 9/13 m

An object of mass m at the end of a string of length r moves in a vertical circle at a constant angular speed ω.

What is the tension in the string when the object is at the bottom of the circle?

• A. m(ω²r + g)

• B. m(ω²r – g)

• C. mg(ω²r + 1)

• D. mg(ω²r – 1)