A box is pushed using 500 joules of energy. The amount of energy produced is 50 J. Calculate the efficiency.

True or false graphs must include scales that increase by the same amount

In a good thermo flask the main cause of heat loss is

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?