Aroller coaster takes energy to make the first rise, but then it should be able to run the course of the track without any input of energy. this, however, is not true. energy continues to be needed. this is because some of the energy is converted to sound energy, and some is given off as heat energy. this is a good example of which law?

the first law of thermodynamics
the second law of thermodynamics
the third law of thermodynamics
the zeroth law of thermodynamics

One hazard of space travel is debris left by previous missions. there are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. calculate the force exerted by a 0.110 mg chip of paint that strikes a space shuttle window at a relative speed of 5.00 ✕ 103 m/s and sticks, given the collision lasts 6.00 ✕ 10-8 s. such a collision chipped the window of the ill-fated challenger in june 1983, causing $50,000 of damage.