Horizontal Universal Circular Motion

A ball travels in a circular path so that it undergoes a centripetal acceleration of 12.5 m/s² in magnitude. What is the radius of the circle if the speed of the ball is 6.52 m/s?

• 0.522 m

• 24.0 m

• 1.92 m

• 3.40 m

A moth travelling at a constant speed takes 8.25 s to circle a light bulb with a radius of 7.50 cm. What is the speed of the moth?

• 5.71 cm/s

• 2.86 cm/s

• 6.91cm/s

• 1.82 cm/s

The carriages on a Ferris wheel travel at a speed of 1.86 m/s. If the wheel has a radius of 6.25 m, what is its period of rotation?

• 3.48 s

• 10.6 s

• 18.7 s

• 21.1 s

The wheel of a car has a radius of 42.0 cm. If the car is travelling a 90.0 km/h, what is the centripetal acceleration of points on the circumference of the wheel?

• 6.88 x 10³ m/s²

• 3.78 x 10³ m/s²

• 1.93 x 104 m/s²

• 1.49 x 10³ m/s²

Tags

NGSS.HS-PS2-1

Which of the following increase the centripetal force?

• Increasing the radius
• Increasing the velocity
• Decreasing the mass
• Decreasing the acceleration

Calculate the centripetal force required to make a 5 kg ball move 4 m/s in a circle with a radius of 2 m.

• 10 N
• 20 N
• 30 N
• 40  N

Tags

NGSS.HS-PS2-1

Which represents the acceleration of the ball?

• A
• B
• C
• D

Tags

NGSS.HS-PS2-1

A 1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. What is the magnitude of the friction force required to keep the car from sliding?

• 9000 N
• 9800 N
• 300 N
• 3000 N

Tags

NGSS.HS-PS2-1