Reference no: EM132782627

1) Your car is broken, so you're pushing it. If your car has a mass of 874 kg, how much momentum does it have when it's moving forward at 3.86 m/s (13.9 km/h)?

2) When your car is moving at 4.15 m/s and the car has a mass of 849 kg, how much translational kinetic energy does it have?

3) Let your car have a mass of 859 kg. Your car is moving at a speed of 4.51 m/s when it strikes a parked car and stops in 0.17 s. What force did the parked car exert on it to stop it that quickly?

4) You're at the roller-skating rink with a friend who weighs twice as much as you do. The two of you stand motionless in the middle of the rink so that your combined momentum is zero. You then push on one another and begin to roll apart. If your momentum is then 460 kg·m/s to the left, what is your friend's momentum?

5) An elevator releases 11400 J of gravitational potential energy while descending 5.00 m between floors. How much does the elevator weigh?

6) When you push down on the handle of a doll-like wooden nutcracker, its jaw pivots upward and cracks a nut. If the point at which you push down on the handle is 7 times as far from the pivot as the point at which the jaw pushes on the nut, how much force will the jaw exert on the nut if you exert a force of 19 N on the handle? (Assume that all forces are at right angles to the lever arms involved.)