A soccer ball of mass 0.43 kg is coming straight at an 80 kg soccer player at 13 m/s. The player kicks it back in the exact opposite direction at 26 m/s with an average force of 1250 N. How long did the player's foot contact the ball

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?

Which notation is used to represent an alpha particle? a. b. c. d.