Heat engine uses thermal energy flowing from a heat source that is 225 K to a cold sink that is 50 K. What is the approximate efficiency of the heat engine?

What would be the effect of loss of biodiversity in an ecosytem

Which series consists of radioactive nuclides produced by successive radioactive decay until a stable nuclide is reached?

Which one of the following is the pigment found in redheads? a) Keratin b) Melanin c) Pheomelanin d) Cortex

Explain why a change in velocity affects acceleration

You're using a rope to pull a sled at constant velocity across level snow, with coefficient of kinetic friction 0.050 between sled and the snow. The sled is loaded with physics books, giving a total mass of 39 kg 1.

Marcia ran at a speed of 3.50 meters per second. How fast was she running in kilometers per hour?

What is the gravitational force related to the distance between two objects?

How does a rilling can work

The energy content of a certain food is to be determined in a bomb calorimeter that contains 3 kg of water by burning a 2-g sample of it in the presence of 100 g of air in the reaction chamber. If the water temperature rises by 3.

If one side of switch is open and another one closed so what gone happen