In a simple machine the energy input is 120J if the efficiency of the machine is 80% calculate the energy output

Why don't you see your reflection in water with waves or repples

Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?