Question

1 If a 71-kg astronaut at rest in space throws a ball with mass 0.61 kg at a speed of 12 mph. What happens to the astronaut as a result? 4 A moving ball collides elastically with another ball that is twice as heavy and is initially at rest. What happens to the lighter ball as a result of the collision? (a) She picks up some of the movement of the ball, causing her to move forward. (b) She doesn't move because her mass is greater than that of the ball. She moves backward due to the force the ball exerts on her. (a) It comes to a stop. (b) It bounces back in the opposite direction. It continues at the same speed. (d) It slows down. (d) Her direction of linear motion depends on the spin of the ball 5 A 64-kg astronaut in a 1.9e +05-kg space station moves across the station by pushing off a wall. If she pushes the wall with a force of 17 N for one second to launch herself across the station, what will be the change in velocity of the station as a result of this push? 2 One car at 21 mph rear-ends another car that is moving in the same direction at 14 mph and weighs half as much. Immediately after the colli- sion the car in front is moving at 16 mph. How fast is the car in back going? (a) 6 mph (b) 36 mph (ef 19 mph (d) 20 mph Voi = U, VzEur (a) 8.90-15 m/s (b) 0.00018 m/s (c) 0.00016 m/s 0.00013 m/s 16 atlu -D - 64kg P= 109x f = 170 3 A moving ball collides elastically with another ball that is half as heavy and is initially at rest. What happens to the heavier ball as a result of the collision? (a) It slows down. (b) It continues at the same speed. It comes to a stop. (d) It bounces back in the opposite direction.

answer all please

Answer 1

Due to backward force it move back (newton 3rd law) options By momentum conservation, (mx21) + m (14) in (16) + me 21m+ im = am the [u=20mph optim heaner ball bensfer moment to the light ball, so it slows down optim h - it slows down; option-D] force x time = 17x1= change in momentin 1.98loser = 8.95X10 sms options