Jennifer is walking at 1.22 m/s. If Jennifer weighs 552 N, what is the magnitude

Question

Jennifer is walking at 1.22 m/s. If Jennifer weighs 552 N, what is the magnitude of her momentum? A) 97.0 kg m/s B) 137 kg m/s C) 68.6 kg m/s D) 672 kg m/s E) 951 kg m/s A 1.0-kg ball has a velocity of 12 m/s downward just before it strikes the ground and bounces up with a velocity of 12 m/s upward. What is the change in momentum of the ball? A) zero kg m/s B) 12 kg m/s, downward C) 12 kg m/s, upward D) 24 kg m/s, downward E) 24 kg m/s, upward A projectile is launched with a momentum of 200 kg * m/s and 1000 J of kinetic energy. What is the mass of the projectile? A) 5 kg B) 10 kg C) 20 kg D) 40 kg E) 50 kg A 0.2-kg steel ball is dropped straight down onto a hard, horizontal floor and bounces straight up. The ball's speed just before and just after impact with the floor is 10 m/s. Determine the magnitude of the impulse delivered to the floor by the steel ball. A) zero N s B) 2 N s C) 4 N s D) 20 N s E) 200 N s A machine gun fires 25-g bullets at the rate of 4 bullets per second. The bullets leave the gun at a speed of 1000 m/s. What is the average recoil force experienced by the machine gun? A) 10 N B) 20 N C) 100 N D) 200 N

Explanation / Answer

6)

magnitude of momentum = mass * velocity
magnitude of momentum = 552/9.8 * 1.22

magnitude of momentum = 68.7 Kg.m/s

the correct option is c) 68.7 Kg.m/s

7)

change momentum of the ball = final momentum - initial momentum

change momentum of the ball = 1 * (12 - (-12))

change momentum of the ball = 24 Kg.m/s

change momentum of the ball is 24 Kg.m/s upwards

8)

let the mass is m

as KE = p^2/(2m)

1000 = 200^2/(2 * m )

m = 20 Kg

the mass of projectlie needed is 20 Kg

9)

magnitude of impulse = change in momentum

magnitude of impulse = 0.2 * (10 - (-10))

magnitude of impulse = 4 N.s

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