How much energy does a 100 watt light bulb use in 1 hour? Express your answer in (a) joules and in (b) kilowatt-hours. (c) Also find how much money it costs if electricity sells for 10 cents per kW-h
(a) 360,000 J, (b) 0.1 kW-h, (c)1 cent
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Dark matter has not been observed at any electromagnetic wavelength
Indicate whether the statement is true or false
An AC voltage source, with a peak output of 114 V, is connected to a 40.0-? resistor. What is the effective (or rms) current in the circuit?
a. 2.02 A b. 1.43 A c. 2.85 A d. 4.03 A e. 5.70 A
Which of the following statements is false?
a. Energy can be converted from one form to another. b. Energy comes in different forms. c. Energy can be stored to a greater or lesser extent. d. Energy can be moved or transferred. e. Energy is constantly being destroyed by humans.
Regional metamorphic rocks are distinguished from igneous rocks because
A) they are finer grained. B) regionally metamorphosed rocks are foliated and igneous rocks are not. C) igneous rocks have interlocking grains and metamorphic rocks do not. D) metamorphic rocks often have a "baked zone" and igneous rocks do not.