A: chemical
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A javelin has a mass of 0.80 kg. The javelin is released with 250 J of kinetic energy. What is the speed of the javelin?
Which source releases carbon dioxide, a greenhouse gas, when generating electricity?
A crane lifts a load of 6000 N through a vertical distance of 15 m in 30 s. What is the average useful power during t…
A piece of wire has a resistance of 16Ω. Another wire made from the same metal has four times the length and twice th…
A battery of e.m.f. E is connected in a circuit containing three resistors. The readings of two ammeters and a voltme…
One kilowatt-hour of energy costs $0.24. How much does it cost to run a 2 kW heater for three hours?