1.) Starting from rest, two skaters push off against each other on smooth level ice, where friction is negligible. One is a woman that weighs 56 kg, and one is a man that weighs 88 kg. The woman moves away with a velocity of 2.5 m/s. Find the recoil velocity of the man.
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- A hockey stick exerts an average force of39 N[S] on a 0.20 kg hockey puck over a displacement of 0.22 m. If the hockey puck started from rest, what is the final velocity of the puck? Assume that the friction between the puck and the ice is negligible.A 48.1-kg person, running horizontally with a velocity of +3.23 m/s, jumps onto a 16.8-kg sled that is initially at rest. (a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away. (b) The sled and person coast 30.0 m on level snow before coming to rest. What is the coefficient of kinetic friction between the sled and the snow? (a) Number i (b) Number i Save for Later Units Units Attempts: 1 of 3 used Submit AnswerA 76.1 kg astronaut of holding a 12.3 kg tool pack while drifting at 10.6 m/s to the right. She throws the tool pack away so that it is drifting at 1.5 m/s to the left. How fast is she moving after the throw? Assume that they are out in deep space with no other forces acting on them.
- In a game of pool, the cue ball strikes another ball initially at rest. After the collision, the cue ball moves at 3.50 m/s along a line making an angle of 22.0 degrees with its original direction of motion and the second ball has a speed of 2.00 m/s. a) Find the angle between the direction of motion of the second ball and the original direction of motion of the cue ball. b) Find the original speed of the cue ball. c) Is the kinetic energy conserved? Show your proof.7. Refer to Conceptual Example 3 as an aid in understanding this problem. A hockey goalie is standing on ice. Another player fires a puck (m = 0.17 kg) at the goalie with a velocity of +65 m/s. (a) If the goalie catches the puck with his glove in a time of 5.0 × 10-³ s, what is the average force (magnitude and direction) exerted on the goalie by the puck? (b) Instead of catching the puck, the goalie slaps it with his stick and returns the puck straight back to the player with a velocity of -65 m/s. The puck and stick are in contact for a time of 5.0 × 10-3 s. Now what is the average force exerted on the goalie by the puck? Verify that your answers to parts (a) and (b) are consistent with the conclusion of Conceptual Example 3.A 90.0 kg fullback running 36.9° north of east with a speed of 5.00 m/s is tackled and held onto by an 60.4 kg opponent running north with a speed of 5.34 m/s. What is the magnitude of the velocity of the players immediately after the tackle?
- A 42.3-kg person, running horizontally with a velocity of +2.09 m/s, jumps onto a 17.5-kg sled that is initially at rest. (a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away. (b) The sled and person coast 30.0 m on level snow before coming to rest. What is the coefficient of kinetic friction between the sled and the snow? (a) Number i (b) Number i Save for Later Units Units Attempts: 2 of 3 used Submit AnswerA baseball pitcher (m = 85 kg) is initially standing at rest on an extremely slippery, icy surface. He then throws a baseball (m = 0.14 kg) with a horizontal velocity of 54 m/s. What is the recoil velocity of the pitcher? (Assume that the positive direction is where the baseball is thrown. Indicate the direction with + or -