DVC PHYS 130 Quiz 7 due 11/6. Sow all your work for every question.1) Which of the following quantities are units of momentum? (There is more than one correct choice.) A) N ∙ s B) kg ∙ m 2/s2 C) N ∙ m D) kg ∙ m/s E) kg ∙ s/m 2) A very elastic rubber ball is dropped from a certain height and hits the floor with a downward speed v. Since it is so elastic, the ball bounces back with the same speed v going upward. Which of the following statements about the bounce are correct? (There could be more than one correct choice.) A) The magnitude of the ball's momentum was the same just before and just after the bounce. B) The ball's momentum was conserved during the bounce. C) The ball had the same momentum just before and just after the bounce. D) None of the above statements are correct. 3) A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the momentum change during the collision is correct? A) The magnitude of the momentum change experienced by each one is directly proportional to its mass. B) The truck experiences the greater magnitude momentum change. C) The small car experiences the greater magnitude momentum change. D) The magnitude of the momentum change experienced by each one is inversely proportional to its mass. E) The small car and the truck experience the same magnitude momentum change. 4) During World War I, Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away. This gun also had a very long barrel. What was the reason for using a long barrel in these guns? A) to allow the force of the expanding gases from the gunpowder to act for a longer time B) to exert a larger force on the shells C) to increase the force exerted on the bullet due to the expanding gases from the gunpowder D) to reduce the force exerted on the bullet due to the expanding gases from the gunpowder E) to reduce frictional losses 5) In the figure, determine the character of the collision. The masses of the blocks, and the velocities before and after, are shown. The collision is A) completely inelastic. B) partially inelastic. C) perfectly elastic. D) characterized by an increase in kinetic energy. E) not possible because momentum is not conserved. 6) Two air track carts move along an air track towards each other. Cart A has a mass of 450 g and moves toward the right with a speed of 0.850 m/s. Cart B has a mass of 300 g and moves toward the left with a speed of 1.12 m/s. What is the total momentum of the two-cart system? A) 0.750 kg ∙ m/s toward the right B) 0.750 kg ∙ m/s toward the left C) 0.719 kg ∙ m/s toward the right D) 0.719 kg ∙ m/s toward the left E) 0.047 kg ∙ m/s toward the right 1 What is the instantaneous velocity of the crate at time t = 10 s? A) 0. It bounces off the plate at the same angle but at a speed of 320 m/s. starting from rest.25 m/s suddenly collides elastically with a stationary 270-g cart. She suddenly throws her 2.11 m/s B) 1.4 kg ∙ m/s E) 1.4 m/s 11) A forklift pushes a 100-kg crate.7 N ∙ s E) 0.00-kg wrench at 20 m/s in a direction away from the ship. with a horizontal force of magnitude F.4 kg ∙ m/s C) 1.3 N ∙ s B) 0. as shown in the figure.2 kg ∙ m/s D) 5. If she and her spacesuit have a combined mass of 200 kg.106 m/s C) 1. how long does it take her to coast back to her spaceship? A) 1000 s B) 250 s C) 500 s D) 750 s E) 2.36 m/s E) 2.1 m/s C) 0. What is the speed of the 320-g cart just after the collision? A) 0. traveling horizontally at 25 m/s.30 N ∙ s .7) A 0. strikes a wall and rebounds at 19 m/s.52 N ∙ s C) 300 N ∙ s 2 D) 6.8 kg ∙ m/s 8) Astronaut Jennifer's lifeline to her spaceship comes loose and she finds herself stranded.72 m/s 10) A 320-g air track cart traveling at 1. strikes a steel plate at an angle of 30° with the plane of the plate.21 m/s E) 1.50 min 9) A 320-g air track cart traveling at 1. traveling at 350 m/s.25 m/s suddenly collides elastically with a stationary 270-g cart. What is the magnitude of the change in the momentum of the ball during the rebound? A) 72 kg ∙ m/s B) 4. The graph in the figure shows the x component of this force as a function of time. "floating" 100 m from the mothership.00 cm/s B) 25 cm/s C) -75 cm/s D) 75 cm/s E) -25 cm/s 12) A super dart of mass 20 g.68 m/s D) 0.10-kg ball. What is the speed of the 270-g cart just after the collision? A) 0. What is the magnitude of the impulse that the plate gives to the bullet? A) 4.678 m/s B) 0.14 m/s D) 1. The block then moves against a spring and compresses it by 3.0-kg block that is at rest on a frictionless horizontal surface.6-kg block recoils with a velocity of vf = 0.0-g bullet is suddenly shot into a 4. the 5. The bullet remains lodged in the block.5 m/s to the right. After the collision. If the blocks are in contact for 0. What was the initial speed v of the bullet? A) 480 m/s B) 520 m/s C) 460 m/s 3 D) 440 m/s E) 500 m/s . as shown in the figure. what is the magnitude of the average force on the 5.6 kg.6-kg block. The force constant (spring constant) of the spring is 2500 N/m. moving on a frictionless surface with a velocity of vi = 6.13) A block of mass m = 5.70 m/s to the left.7 cm. while the two blocks are in contact? A) 0 N B) 192 N C) 182 N D) 202 N E) 0 N 14) An 8. as shown in the figure. collides with a block of mass M at rest.20 s.