Along distance runner has an average speed of 4m/s during a race. how far does the runner travel in 20 minutes?

What is the order of the moon, earth, and sun in a lunar eclipse and a solar eclipse?

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

If 2 moles of co_2 at 2l and 500k are expanded reversibly to 20l, more work can be obtained from an adiabatic process than from an isothermal process. is the above statement true or false?