Question 6 8 pts How long does it take a 23 kW steam engine to do 5.6 x 108 J of work? (Show your work using the GUESS method? O 129 hours O 4.1 hours 0.22 hours 5.5 hours Question 7 8 A ball that has a mass of 705 g is dropped from a height of 4.2 m. What is the mechanical energy of the ball? (Show your work using the GUESS method) Question 7 8 pts A ball that has a mass of 705 g is dropped from a height of 4.2 m. What is the mechanical energy of the ball? (Show your work using the GUESS method) O 168J O 3000 J O 29571 J O 29 J Question 8 A vaulter carrying a graphite-Fiberglass pole (A thin-walled tube weighting around 4lb) is about a jump. At what speed must she run in order to clear the 6.096 m bar? Take his center to be 1. and presume that it just clears the bar. (Show your work using t Question 8 8 pts A vaulter carrying a graphite-Fiberglass pole (A thin-walled tube weighting around 4lb) is about to make a jump. At what speed must she run in order to clear the 6.096 m bar? Take his center to be 1.0 m about the floor while standing and presume that it just clears the bar. (Show your work using the GUESS method) 09 m/s O 6 m/s O 8 m/s O 10 m/s Question 9 8 the right. As it glides Question 4 8 pts Consider a pendulum swinging back and forth. At different points in its motion the energy is all of one form or the other, but the balance continually shifts. When the mass is lowest the energy is all O kinetic O nuclear O potential O chemical Question 5 For any 8 system that undergoes a change, the total energy before the change is the same for the change. D D Question 3 Power Energy Momentum O Force Question 4 is the rate at which the work is done. Question 9 8 pts A roller-coaster cart, initially stationary at position a, is given a gentle push to the right. As it glides along the track, it passes through positions b, c, and d. Assume that friction and air resistance can be ignored. At which position(s) is/are potential and kinetic energy equal? 10 m b 186 d U 5 m b 8 F Question 10 8 pts You shoot a 2.0 kg basketball toward the hoop with an initial total energy of 500 J. What principle are you demonstrating? Newton's Law of Universal Gravitation Newton's Second Law of motion Newton's First Law of Motion Law of conservation of energy Newton's Third Law of motion No new data to save. Last checked at 2:28pm Submit Question 1 8 pts A hockey puck with mass 0.29 kg is stationary on the ice. A hockey player uses her stick to shoot the puck by applying a 6.1 N force over a distance of 0.66 m. What is the change in the velocity of the puck (Show your work using the GUESS method) O 2.7 m/s O 5.3 m/s O 1.6 m/s O 0.0031 n.s O 14 m/s Question 2 8 A. 40 kg wheeled cart needs to be moved to the top of a platform that is 1.0 m high. How much pa ick un the cart and place it on the platform in 3.0 s? (Show your work using the the