A 8000-N car is traveling at 50 km/h. It strikes a 12000-N car, which is stationary. The two cars stick together. Their common final speed (in m/s) is: 8.9 .a O 7.8 .b O 6.7 .c O 4.5 .d O 5.6 .e O
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- A 0.508 kg ball, initially moving with a speed of 3.3 m/s bounces off a wall and then moves with a speed magnitude half of its original directed in the opposite direction. If the ball is in contact with the wall for 5.8 m/s, what is the magnitude of the average force that the wall exerts on the ball? A. 147.32 N B. 433.55 N C. None of the above32)A 61.00 kg hockey play skates due North on a frictionless ice rink with a velocity of 10.00 He is tackled by a second hockey player of mass 78.00 kg who was initially skating due West at velocity 15.00 Assume the collision is perfectly inelastic, resulting in the two players "sticking together." m S W of Ꮎ N S E m S
- 3. An urban myth states that a penny dropped from the top of the Empire State Building (1440 ft tall) in NYC could be lethal. Ignore air friction and find the final velocity of the penny.Calculate the probability that a particle in a one- dimensional box of length a is found between 0.32a and 0.35a when it is described by the following wave functions: a. b. π.Χ. sin a √ sin (³7.x) a What would you expect for a classical particle? Compare your results for (a) and (b) with the classical result.how to do?
- 3. A0.03-lb bullet traveling at 1300 ft/s strikes the 10-lb wooden block and exits the other side at 50 ft/s as shown. Determine the speed of the block just after the bullet exits the block, and also determine how far the block slides before it stops. The coefficient of friction between the block and the surface is u = 0.5. 50 ft/s 13 4 1300 ft/s 12The ballistic pendulum is a device to measure the speed of a bullet using conservation of energy and momentum. A 20 g bullet is fired horizontally into a 1.1 kg wood block hanging from a 1.2-m-long string. The bullet embeds itself into the block, and the block then swings out to an angle of 35°. A. How high does the block of wood go relative to its initial height when its hanging straight down? B. What is the increase in gravitational potential energy of the wood block at its maximum height? C. Use conservation of energy to determine the speed of the block just after the bullet strikes it. D. Use conservation of momentum to determine the speed of the bullet right before it strikes the block.slapshot Vo Slapshot: A hockey puck is hit by a hockey stick. The approximately constant force is 69 N, which acts for a time of 0.11 s. What is the speed of the puck after the slapshot? (Standard hockey puck mass 160 grams, and radius 7.6 cm.) (in m/s) OA: 6.44 OB: 8.57 C: 11.40 OD: 15.16 OE: 20.16 OF: 26.82 OG: 35.67 OH: 47.44