The time constant in an RC circuit is the time that is required for the current in a circuit with an initially uncharged capacitor to reach what percentage of its final value?
A. 63%
B. 90%
C. 37%
D. 100%
E. 50%
C. 37%
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List the three common states of matter in order from the state with the fastest-moving particles to the state with the slowest-moving particles.
A) solid B) liquid C) gas D) none of the above
About what percentage of molecules in the air make up the atmosphere below a 6-kilometer altitude?
A) 20% B) 30% C) 40% D) 50% E) more than 50%
The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years. Suppose you have samples of both isotopes, and that they initially have the same activity (number of decays per second)
What must be true of the numbers of cobalt-60 and strontium-90 nuclei in these samples? A) There are more strontium-90 than cobalt-60 nuclei. B) There are equal numbers of cobalt-60 and strontium-90 nuclei. C) There are more cobalt-60 than strontium-90 nuclei. D) It is not possible to compare numbers of nuclei without knowing the masses of the samples.
Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. Linear momentum
a. is definitely conserved b. is definitely not conserved c. may or may not be conserved d. none of the above