PHYSICS 20
CHAPTER 5: CIRCULAR MOTION ASSIGNMENT
1. A CD player rotates at an average of 8000 turns per minute. If the radius of the CD is 48.0 mm,
determine the
a. Period
b. Frequency
c. Velocity
2. A rotten little boy snared a 2.33 kg gopher and began swinging it over his head in a horizontal circle with
a radius of 130 cm. What is the centripetal force when it has a frequency of 2.11Hz?
3. A 850 kg car rounds an unbanked curve that has a radius of 65 m. If the coefficient of friction between
the car and the road is 0.89, what is the maximum speed the car can round the curve without skidding?
4. A 1.30 x 103 kg truck moving at a speed of 21.0 m/s rounds an unbanked curve that has a radius of 80.0
m. It is a cold winter morning and the road is slightly icy, reducing the coefficient of friction between the
tires of the truck and the road to 0.700. Does the truck make it around the curve without sliding?
5. An airplane makes a complete circle with a radius of 4.50 km in 2.35 minutes. What is the centripetal
acceleration of the plane?
6. Imagine the little kid from the movie “Home Alone” vertically spinning a dozen eggs with a mass of 760 g
in a plastic shopping bag 90 times per minute. The spinning eggs make a radius of 30.0 cm.
a. What is the tension in the bag at the top of the circle?
b. What is the tension in the bag at the bottom of the circle?
c. What is the minimum speed necessary to keep the eggs in the circle?
7.
Neptune has a moon Galatea that orbits at an orbital radius of 6.20 x 107 m. Nereid, another moon of
Neptune has an orbital radius of 5.513 x 109 m and an orbital period of 360.14 days. Determine the
orbital period of Galatea.
8.
The International Space Station orbits Earth at a height of 359.2 km. What is its orbital speed?
9.
A 5.0 x 103 kg satellite orbits the earth at a distance of 2.2 x 107 m from Earth’s center. If the gravitational
force acting on the satellite is 4.2 x 103 N, calculate the speed of the satellite.
10. A star in the Sombrero Galaxy is found to have a planet orbiting it at an average radius of 2.37 x1011m
and an orbital period of 354 Earth days. What is the star’s mass?
11. What is the radius of a planet that has a mass of 5.77 x 1025 kg if a 22.0 kg object has a weight of 65.4 N
when it is on the planet’s surface?