Which of the following is Newton's Law on Gravitation?

• F=Gm₁m₂/r
• F = Gm₁m₂/r²
• F = Gm₁m₂/2r
• F = m₁m₂/2r

Two factors affecting the magnitude of the force of gravity between 2 objects are...

• mass and distance

• mass and matter

• distance and weight

• weight and mass

Centripetal force, created by swinging something in a circle, acts in a direction--

• along the path of motion

• away from the center of the circle

• toward the center of the circle

• tangent to the circle

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

Calculate the velocity of an object moved around a circle with a radius of 1.65 m and an acceleration of 3.5 m/s².

• 2.4 m/s
• 3.6 m/s
• 3.9 m/s
• 4.2 m/s

Calculate the mass of an object if it took 20 N to rotate it in a circle with a radius of 2 meters with a velocity of 4 m/s

• 4.1 kg
• 3.6 kg
• 2.5 kg
• 1.8 kg

A fan spins with a constant angular speed of 500 radians/second. How long will it take to cover an angle of 2π radians (one revolution)?

• 0.013 s
• 0.002 s
• 76.9 s
• 6.28 s

Which of the following increase the centripetal force?

• Increasing the velocity
• Decreasing the mass
• Decreasing the angular velocity

Pulling out of a dive, the pilot of an airplane guides his plane into a vertical circle with a radius of 600 m. At the bottom of the dive, the speed of the airplane is 150 m/s. What is the apparent weight of the 70-kg pilot at that point?

• 3300 N

• 690 N

• 2600 N

• 490 N

The space shuttle is orbiting the Earth clockwise. Which vector shows the direction of the gravitational force acting on the shuttle?

• a

• b

• c

• d