If two tiny identical spheres attract each other with a force of 3 N when they are 25 cm apart, what is the mass of each sphere? A. 5,302 kg
B. 53,020 kg
C. 230 kg
D. 1.7 kg

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?