Imagine an engine that operates in a Carnot cycle between the same temperature extremes as found in this cycle. Calculate the ratio of the Carnot efficiency to the actual efficiency of this engine.

Which statements describe the movement of ocean currents around the globe? check all that apply. strong winds force warm water to sink to the ocean floor. the coriolis effect causes warm and cold water to mix. cool dense water sinks to the ocean floor. warm water replaces cool surface water. wind blowing parallel to the shore causes upwelling of cool water.

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?

Which of the following is a measure of the amount of light a star directly emits?               a.  luminosity    b.  intensity    c.  wavelength    d.  brightness