A 2.0 ?F capacitor is charged to 12. V and then discharged through 4 × 106 ?. How long will it take for the voltage across the capacitor to drop to 3.0 V?
What will be an ideal response?
11.1 s
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A 0.6-kg sample of a wooden artifact has an activity of 2.00 × 10^3 decays per minute. What is the age of the artifact? Note that living material has an activity of 15.0 decays/minute per gram of carbon present, and T1/2 for 14C is 5730 yr
a. 12,434 yr b. 8,618 yr c. 18,164 yr d. 12,590 yr
How is heat exchanger efficiency described?
What will be an ideal response?
Explain how we can estimate the geological age of a planetary surface from its number of impact craters.
Fill in the blank(s) with the appropriate word(s).
A cluster containing a thousand or more galaxies, usually mostly ellipticals, scattered over a volume only a few Mpc in diameter is referred to as a(n) _____
A) elliptical galaxy cluster B) irregular galaxy cluster C) poor galaxy cluster D) rich galaxy cluster