T-Mobile 7:50 PM 71% 11) Which combination of statements is most accurate? [Ente
ID: 2269360 • Letter: T
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T-Mobile 7:50 PM 71% 11) Which combination of statements is most accurate? [Enter your answer as a string of the letter options you believe are correct. For instance, if you think options A, D, and E are correct, then enter "ADE". NOTE: There are only 5 tries for this problem.] A) Thermal energy increases during inelastic collisions. B) Inelastic collisions are reversible processes C) Thermal energy doesn't change during elastic collisions. D) Elastic collisions are reversible processes E) None of the above Answer: During an elastic collision, which type of energy may change? 12) Which combination of options is most accurate? [Enter your answer as a string of the letter options you believe are correct. For instance, if you think options A, D, and E are correct, then enter "ADE". NOTE: There are only 5 tries for this problem.] A) Thermal energy B) Kinetic energy C) Potential energy D) The sum of kinetic and potential energies E) None of the above Answer: 13) Two 1.5 metric ton cars crash into each other. Both collide head-on, and each was travelling 24 mi/hr when the collision occurred. The wreckage is at rest after the collision. How much thermal energy was gained by the cars and road in the collision? (in case you ane worried, these were driverless vehicles with no passengers inside!) Answer: 14) Recall that a 100 W lightbulb uses up 100 Joules of energy in 1 second. If there was a way that the thermal energy from the accident described above could be completely captured and used to power such a bulb, how long would it stay lit? (Note: there is no actual way to do this!) Answer: 15) You drop three different types of balls: a 0.06 kg tennis ball with coefficient of restitution (COR) 0.70, a0.0 flubber ball with COR 0.95, and a 0.03 kg glass marble with COR 0.65. You drop them all so that they hit the ground with a speed of 4.43 m/'s. How much thermal energy is generated during the impact with the ground? [Enter your answers in the boxes below in the same order that the different types of balls are listed in the Answer 1 of 3: Answer 2 of 3: Answer 3 of 3:Explanation / Answer
11] During an inelastic collision, energy of the system is not conserved so part of the initial energy is dissipated as heat (thermal energy) and so thermal energy increases during inelastic collision.
Because this heat is dissipated to the environment, this inelastic collision is irreversible.
In an elastic collision, no energy is given off to the surroundings since the kinetic energy is conserved in the collision. Therefore, the thermal energy does not change here. It is for this reason that this collision is reversible.
So, the final answer is: ACD.
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