Most of the elements heavier than helium were made during the first few minutes after the big bang
a. True
b. False
Indicate whether the statement is true or false
False
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Significant Figures: Express the sum of 420.77, 13.821, and 2317.8 to the correct number of significant figures.
Fill in the blank(s) with the appropriate word(s).
A gas originally occupies a volume of 0.5 m3 at a pressure of 100 kPa. It is slowly allowed to expand until the volume is 2.5 m3. Assuming the temperature is kept constant, the final pressure will be
A. 10 kPa. B. 50 kPa. C. 500 kPa. D. 100 kPa. E. 20 kPa.
Suppose an electrical wire is replaced with one having every linear dimension doubled (i.e., the length and radius have twice their original values). The wire now has
1.more resistance than before. 2.less resistance. 3.The same resistance.
A ping-pong ball covered with a conducting graphite coating has a mass of 2.5 × 10^-3 kg and a charge of 4.0 µC. What electric field directed upward will exactly balance the weight of the ball? (g = 9.8 m/s2)
a. 6.1 × 10^3 N/C c. 5.1 × 10^6 N/C b. 2.0 × 10^-7 N/C d. 1.2 × 10^4 N/C