Two objects (for example, two toy balloons) in the laboratory are observed to attract each other. Can we be certain that both are electrostatically charged?
No. Only one balloon must possess a charge. The other balloon could be charged by
induction by the first charged balloon. It is also possible, however, that both balloons
are charged, one positively and the other negatively.
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The second law of thermodynamics implies
that a) heat can be used to do work only if a thermal reservoir at a lower temperature is available. b) the total energy of a body is the sum of kinetic energies of all its molecules. c) bodies cool at rates proportional to their temperature excess above their surroundings. d) energy cannot be destroyed.
Bacteria are examples of
A) unicellular prokaryotes B) unicellular eukaryotes C) multicellular eukaryotes D) multicellular prokaryotes
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion.The acceleration is zero
a. True b. False Indicate whether the statement is true or false
If the north poles of two bar magnets are brought close to each other, the magnets will
A) attract. B) repel.