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3, A 500 kg wagon is moving at a velocity of 15.0 my's at the top of = 350 m rollercoaster, What will be its velocity at the top of a second hill of height 20.0 m/s? PE = 171500 ke =56,250 PE = 73, 500 V = 15 mg 55m V= 24.7 m/s m1=500 kg ve 30.2ml; V= 23 mis Pe = Q Ke =228010 VF= vitzad VF'= 152 2x95X 35) V= (2KE/m) VR= 725+686 V = V(2)154 510/500 ve?=Jan V= 24. 7mls ve = 30.2m/s 4, A 20 0 g bullet moving at 300 m/'s hits a 3.0 kg block hanging from a ceiling fat rest). If the bullet emerges from the block at 100 m/'s, find the height of the block after the bit. Momentum and energy problem 5. A 1600 kg car increases its velocity from 10 knyh to 30 km/h in 5,0 seconds, Find the following: al Power needed at 100%% efficiency b) Power needed at 35% efficiency () Work done by the motor dy Impulse provided by the motor 6. A 450 g ball comes at a velocity of 15.0 m/'s and is kicked in the opposite direction with a speed of 19,0 m/'s. If the contact with the ball is 4.2 milliseconds, find the force exerted by the foot on the ball. 9. A dam has water flowing located 80 m high and the amount of water flowing is equivalent to 5 000 gallons per minute (1 gallon is 3.785 L). If the density of water is 1.0 kg per liter, find the power in Watts produced by this hydroelectric. QUIZ WORK, ENERGY AND POWER B Name Date 1. Calculate the velocity at point B. Note that at the highest point, the block is already moving. There is no `nergy transferred to the surroundings. Mass= 9.0 kg Initial velocity- 5.5 m/'s Height- 22.0m B A 15.0 g bullet is fired into a 3.0 m long pendulum and embeds into the pendulum. If the pendulum has a mass of 2.8 kg and it rises a vertical distance of 15.0 em, what was the initial velocity of the bullet at the moment it hit the pendulum? (Momentum and Energy problem)