AP1 Circular Motion

A car moves in a horizontal circle with a radius of 10 m. The tangential velocity of the car is 30 m/s. What is the car's acceleration?

• 90 m/s²

• 90 m/s² toward center

• 90 m/s² away from center

• -90 m/s²

The gravitational force between the sun and the earth is 3.52x10²² N. The mass of the earth is 5.97x10²⁴ kilograms and its distance from Earth is 150 million kilometers. What is the mass of the sun?

• 1.99x10³⁰ kilograms

• 2.83x1024 kilograms

• 3.55x10³² kilograms

• 3.55x10³² grams

A tetherball swings in a horizontal circle. If the radius of swing is tripled but the tangential speed remains the same, by which factor does the centripetal force change?

• remains the same

• 9x greater

• 3x greater

• 9x less

• 3x less

A tetherball swings in a NEAR horizontal circle. What exact force is battling gravity pushing it down? What exact force is the centripetal force equal to?

• force

• force

• force

• force

Explain a unifying importance of Kepler's Laws, Centripetal Force, and Universal Gravitation.

• a

• a

• a

• a