On an essentially frictionless, horizontal ice rink, a skater moving at 5.0 m/sm/s encounters a rough patch that reduces her speed by 49 %% due to a friction force that is 30 %% of her weight. Use the work–energy theorem to find the length of this rough patch.

On a geologic map, if the contacts between sedimentary rock units form a bull’s-eye pattern of concentric circles, with the youngest unit in the center, the underlying structure is a(n)

The ability to make things happen is also called a. heat b. force c. matter d. energy

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)