$593130 1 Q l. Aisha is pushing snow as shown with a force of35 N at an angle of 40 to the ground. Ifshe pushes the snow 2.0 in, how much work is done? displacement direction 49] "If\" 54J 45 J . Consider a rocket travelling in a straight line for a small distance. Choose the correct fon'nula(s) for expressing the work done by the rocket. a. W: AE k 121 b. W=mvl.mvl2 2 o. W: maAd d. all ofthe above 2 . Choose the correct statement. a. Potential energy = kinetic energy + mechanical energy. b. Gravitational potential energy = 9.8 mfsz. c. Gravitational potential energy and kinetic energy are both measured in joules. d. Kinetic energy takes the direction of the force applied to the object. Water owing through a large dam and hydro generating plant is an example of a. kinetic energy. b. chemical energy. c. potential energy. d. fusion energy. 1:46:00 1823BAB VPN 69% + 5. A book falls off a table and is now I cm from the floor. Which statement is correct? a. The kinetic energy of the book is at its greatest. b. The potential energy of the book is at its greatest. C. The kinetic and potential energies of the book are equal. d. Both the kinetic and potential energies of the book are at their greatest. 6. A mass is suspended vertically by a spring If the mass is allowed to fall freely, the maximum extension of the spring is 5 cm. If the spring is first compressed by 2 cm before the spring is allowed to fall freely, which statement is correct? a. The maximum extension of the spring is more than 5 cm. b. The maximum extension of the spring is equal to 5 cm. C. The maximum extension of the spring is less than 5 cm. d. The spring will remain in the compressed position. 7. A car crash is an example of a(n) a. elastic collision b. inelastic collision C. explosion d. impulse 8. Two particles have a perfectly elastic head-on collision. Particle 1 has mass 1.0 g and particle 2 has mass 5.0 g. Their velocities before the collision are v, , = 4.0 m's [right] and V;2 = 2.0 m/s [left]. Determine the velocities of the two particles after the collision. m, m2 a. Va = 2.3 m/'s [left]; V 2 = 0.30 m/'s [right] b. V = 6.0 m/'s [left]; V2 = 0 m/s [right] c. VA = 2.3 m/s [right]; v 2 = 0.30 m/s [left] d. none of these 9. Which safety devices help prevent automobile accidents? a. seatbelts b. anti-lock brakes C. active head restraints d. all of the above 10. Neutrinos were discovered because nuclear collisions indicated a. a loss of momentum. b. a loss of energy. + C. a loss of mass. d. all of the above3:593:01 1HZEBEIE3 displacement v. time for simple harmonic motion displacement v. time for damped harmonic motion Classify the example collisions. Answer choices may be used more than once. a. elastic collision b. inelastic collision Two cars collide, lock bumpers, and move off together. A golfball strikes a tree. A child jumps on a rotating merry-goround. I. A squid can propel itself by taking water into its body and then expelling it. A 0.60 kg squid expels 0.30 kg of water with a velocity of 20 m/'s [S]. What is the speed of the squid immediately after expelling the water? (A: 15) K +:0 2. Two balls collide in a perfectly elastic collision. Ball A has mass 1.I kg and is initially travelling at a velocity of 2.7 m/'s [EJ. It collides head-on with stationary ball B with mass 2.4 kg. Determine the final velocity of ball B using clastic collision formulas. (A: 15) 17 8:01 1823868