A spring with spring constant k = 800 N/m is extended 12 cm from its equilibrium position. A spring with 6.0 cm extension from equilibrium will have the same potential energy as the first spring if its spring constant is
a. 200 N/m.
b. 400 N/m.
c. 800 N/m.
d. 1 600 N/m.
e. 3 200 N/m.
E
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A circuit consists of N resistors, all of resistance R, connected as shown below. A potential difference V is applied to the circuit. The equivalent resistance of the circuit is
a.
.
b.
R.
c.
Electric voltage is defined as
a)charge transfer per unit time. b)work per unit charge. c)resistance per unit charge. d)work per unit time. ?
Suppose that you are looking at the sky at about midnight on the December solstice. Which star will be nearest to your meridian?
Consider the following data for four stars: Star RA Dec. Spica 13hr24m.1 -11°20' Deneb 20hr39m.7 +45°06' Sirius 6hr44m.2 -16°42' Alpha Centauri 14hr38m.4 -60°46' A) Sirius B) Alpha Centauri C) Spica D) Deneb
The region on the H-R diagram where pulsating variables occur is called the:
A) period-luminosity relation. B) mass-luminosity relation. C) instability strip. D) horizontal branch. E) main sequence appendix.