A certain molecule has f degrees of freedom. Show that an ideal gas consisting of such molecules has the following properties. (Submit a file with a maximum size of 1 MB.) (a) Its total internal energy is fnRT 2 fR
(b) Its molar specific heat at constant volume is (f + 2)R
(c) Its molar specific heat at constant pressure is
(d) Its specific heat ratio is γ =-= (f + 2)

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .