Find the magnitude of the gravitational force a 66.6 kg person would experience while standing on the surface of Earth with a mass of 5.98*10^24 kg and a radius of 6.37*10^6 m. Answer in the units of N.

regarding the circular motion. If there is a mass that is placed on top of a car, and there is a static friction force between these two surfaces, and the car is moving in an arc shape with a certain radius, will fc=mv^2/r be the acting static friction force between the mass and the top of the car?...

A frantic weather reporter is reporting on a live tornado. The reporter exclaims, “Wood, metal, and all kinds of debris are being thrown directly outward from the edge of the funnel.” In light of your understanding of circular motion, comment on the accuracy of the reporter’s statement.

A tractor leaves a muddy field throwing mud into the air with it's rear wheels. The wheels are 1m in radius and the tractor moves off at 8ms-1. What is the maximum height that the mud will reach? And where will this mud land relative to the tractor. I only got far as using centripetal...

This question is driving me crazy. I'm using the formula v=2(pi)(R) / T to find the velocity and then a=v^2 / R to find the final acceleration, but have no luck in getting the correct answer. What I don't understand is how does the period (T) is used in the first formula? Please help. The...