Centripetal Force and Rotary motion

Calculate the amount of centripetal force it takes for a softball pitcher to rotate a ball with a velocity of 3 m/s if the ball weighs .12 kg and her arm is .65 meters long.

• .38
• 1.23
• .55
• 1.66 N

A car traveling at 15 m/s on a flat surface turns in a circle with a radius of 25 m.  What is the centripetal acceleration of the car?

• 2.4 x 10^-2 m/s²
• 0.60 m/s²
• 9.0 m/s²
• zero

Find the mass of an object traveling around a 3 meter radius at 5 m/s with a centripetal force of 150 N.

• 78 kg

• 0.5 kg

• 18 kg

• 90 kg

Calculate the gravitational force between two objects when they are 0.750m apart. Each object has a mass of 5.00kg.

• 2.96x10^-7N

• 3.00x10^-6N

• 2.22x10^-9N

• 2.23x10^-8N

Tags

NGSS.HS-PS2-4

A test car moves at a constant speed around a circular track.  If the car is 48.2 m from the track's center and has a centripetal acceleration of 8.05 m/s², what is the car's tangential speed?

• 19.7 m/s
• 5.99 m/s
• 0.17 m/s
• 388.01 m/s

Tags

NGSS.HS-PS2-1

Find the force of gravity (F_g) for two objects with:

m₁ = 100 kg

m₂ = 1000 kg

d = 500 m

• 2.67 * 10^-11 N

• 0.4 N

• 6.67 * 10^-11 N

• 1.3 * 10^-8 N

Tags

NGSS.HS-PS2-4

Find the distance between two objects with:
m1 = 4500 kg
m2 = 8700 kg
Fg = 2 * 10^-8 N

• 130565.25 m
• 361.34 m
• 0.19575 m
• 0.783 m

A pair of trapeze performers at the circus is swinging from ropes attached to a large elevated platform. Suppose that the performers can be treated as a simple pendulum with a length of 16 m. Determine the period for one complete back and forth cycle.

• 2 sec
• 12 sec
• 8 sec
• 10 sec

A pendulum is 0.75 meters long and has a period of 4.17 seconds. The Pendulum is on an unknown planet.  What is the gravity of the Unknown Planet?

• 9.8
• 3.4
• 1.7
• Greater than 9.8

Tags

NGSS.HS-PS2-4

What is the period on Earth of a pendulum with a length of 2.4 m?

• 3.1 sec
• 1.9 sec
• 9.3 sec
• 5.1 sec

Tags

NGSS.HS-PS2-4