Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. Kinetic energy
a. is definitely conserved
b. is definitely not conserved
c. may or may not be conserved
d. none of the above
B
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What can be said with certainty about a red star and a blue star?
A) The red star is closer to Earth than the blue star. B) The red star is more massive than the blue star. C) The blue star has a greater proper motion than the red star. D) The blue star is hotter than the red star. E) The red star has a greater radial velocity than the blue star.
The kinetic energy of a pendulum is greatest
a. when its potential energy is greatest. b. at the top of its swing. c. at the bottom of its swing. d. when its total energy is greatest.
Intermediate between E7 and Sa galaxies, ________ have a disk but no gas or dust
Fill in the blank(s) with correct word
Consider horizontal parallel plates with a fixed potential difference. The upper plate has a voltage difference of 30 V with the lower plate, and they are separated by 3 cm. You move the two plates carefully to a separation of 4 cm. What is the strength of the electric field between the plates?
A. 1000 volts/meter B. 750 volts/meter C. 7.5 volts/meter D. 3000 volts/meter