A+heat+engine+operates+between+two+ reservoirs+at+300k.+during+each+cyc le,+it+absorbs+200+calories+from+th e+high+temperature+reservoir.+calcu late: (a)+the+maximum+efficiency+of+the+s ystem (b)+the+maximum+works+the+engine+ca n+perform+in+each+cycle

After a big snowfall, you take your favorite rocket-powered sled out to a wide field. the field is 195 m across, and you know that your sled accelerates at a rate of 3.65 m/s2 when the rocket is on. how much time will it take the sled to cross the field starting from rest, assuming the rocket is on the whole time?

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

How do you tell if someone actually cares about you? and just say they do?