A 400. kg roller coaster car is traveling at a constant speed of 12 m/s through a dip with a radius of curvature of 40m. What is the normal force acting on the car at the bottom of the dip?

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?