Which energy resource produces the least amount of air pollution? coal

natural gas

oil

hydropower

A40 kilogram skier starts at the top of a 12 meter high slope. at the bottom, she is travelling 10 meters per second. how much energy does she lose to friction

What is produced from neutralization of an acid and a base? a. hydronium ions b. citric acid c. salt and water

Apound is approximately 0.45 kilogram. a persons weighs 87 kilograms. what is the persons’s weight, in pounds, when expressed to the correct number of significant figures