Circular Motion and Universal Gravitation Practice
- Mary is swinging a tennis ball duct-taped to the end of a 0.25m long string. Why? I don't know why. Mary is weird. Stop asking questions. Anyway, the ball has a mass of 0.05kg and it makes one rotation every 0.6s. What is the tension in the string? (1.37N)
- What is the force due to gravity between a 500kg object and a 250kg object separated by a distance of 0.01m? (0.08N)
- A car is traveling around a circular track at 10m/s. If the track has a radius of 50m, what is the period of the car? (31.4s)
- The sun has a mass of 2.0e30kg and the earth has a mass of 5.97e24kg. They are separated by an average distance of 1.5e11m. What is the force due to gravity between the sun and the earth. (3.54e22N)
- Using your answer from #4, what is the orbital period of the earth in days? (You should know this answer)
- Once again that weirdo Mary is swinging stuff tied to the end of cords. This time it's a sack of potatoes tied to the end of an electrical cord that she found in a vacant lot behind the C-Town in Newark, but I digress. Anyway, the sack of potatoes has a mass of 50kg and a tangential velocity of 5m/s. The cord is 1.25m long. What is the period of the sack of potatoes? (1.57s)