A rocket whose initial mass is  12,500 kg is in deep space and consumes fuel at a rate of  62.5 kg /s .  The speed of the exhaust gases relative to the rocket engine is  2,500 m/s.  What is the thrust of the engines in units of kilo-Newtons (kN)?

3) A golf club exerts an average horizontal force of 1000 N on a 0.045-kg golf ball that is initially at rest on the tee. The club is in contact with the ball for 1.8 milli seconds. What is the speed of the golf ball just as it leaves the tee?

2- A 0.05 kg ball hits a tennis player with a horizontal speed of 30 m/s, and this player sends the ball back horizontally and in the opposite direction +x in the +x direction with a speed of 25 m/s. What is the thrust of the racket on the ball in kgm/s? A) 8,1 B) 12,8 C) 5,42 D) 1,34 E) 2,75

1.) A car that weighs 4000 Ibs. (1814 kg), crashes into a wall. What is the impulsive force (F) if the car goes from 55 mph (88.5 km/h - 24.6 m/s) to 0 m/s in 0.3 sec? Force Units 2.) What if the same car, traveling at the same speed as before, had "crumple zones" (longer time to stop). When this car hits the wall, it takes 0.75 seconds to come to a rest. What is the new impulsive force (F) on the driver? Force - Units 3.) In a car collision, the driver's body must change speed from a high value to zero. This is true whether or not an airbag is used. How does an airbag reduce injuries? 4.) A baseball is pitched at 35 m/s is hit by a batter. After leaving the bat, the ball has a velocity of 50 m/s. The ball weighs 0.15 kg. The time elapsed during the collision was 0.0015 seconds. What was the force (F) exerted on the baseball? Hint: Watch your signs of the velocities, the direction changes. Force = Units

15) A rocket whose initial mass is  14,900 kg is in deep space and consumes fuel at a rate of  74.5 kg /s .  The speed of the exhaust gases relative to the rocket engine is  2,980 m/s.  What is the acceleration of this rocket? a) 2.22 x 108 m/s2 b) 0.067 m/s2 c) 14.9 m/s2 d) 14,900 m/s2 E) 1.52 m/s2

4)  In a collision between two unequal masses, how does the impulse imparted to the smaller mass by the larger mass compare with the impulse imparted to the larger mass by the smaller one? A) It is larger. B) It is smaller. C) They are equal. D) The answer depends on the ratio of the masses. E) The answer depends on how fast they are moving.

Matthew Damon is a 70-kg astronaut on a space-walk outside the international space station. He is at rest when the tether line connecting him to the space station breaks. In order to make it back to the space station he throws his 2.0-kg hammer at a speed of 14 m/s away from the space station. As a result, what speed does the astronaut move toward the capsule? a) 1.5 m/s b) 5.0 m/s c) 0.40 m/s d) 3.5 m/s

7) A force of 186 N acts on a.3-kg bowling ball for 0.40 s. What is the change in velocity of the bowling ball? 8) Small rockets are used to make tiny corrections to the speed of a satellite. If a rocket has a thrust of 35 N and is used to change the velocity of a 72000-kg satellite by 63 cm/s, for how long should it be fired? 9) A 0.24-kg volleyball approaches Tina with a velocity of 3.3 # S. Tina bumps the ball, giving it a speed of 2.4 m/s but in the opposite direction. What average force did she apply if the interaction time between her hands and the ball was 0.025 s? 10) Before a collision, a 25–kg object was moving at +11 m/s. Find the impulse that acted on the object if, after the collision, it moved at -3 m/s

A bullet has a mass of 2.7 g and a muzzle velocity of 1150 ft/s. If fired horizontally, it can penetrate eight 1-inch pine boards before coming to a stop. Each pine board has a thickness 0.8 inches. What is the average stopping force exerted by the wood? a) 10953N                             b) 1018 N                          c) 279 N

A soccer goalkeeper is standing in front of his side goal post an opposite side player shoots the ball (mass = 0.25kg) towards the goalkeeper with a velocity of + 50 m/s . A) If the goalkeeper catches the ball with his hand in 0.25 seconds what is the average force (magnitude and direction ) exerted on the goalkeeper by the ball? B) now instead of catching the ball the goalkeeper kicks back with a velocity of -90m/s the ball was in contact with the goalkeeper leg for about 0.5 seconds what is the average force exerted on the goalkeeper by the ball ??