What is the total energy stored in the group of capacitors shown if the charge on the 30-?F capacitor is 0.90 mC?
a.
29 mJ
b.
61 mJ
c.
21 mJ
d.
66 mJ
e.
32 mJ
d
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Which of the following is TRUE?
a) It is possible for galaxies that are very distant to actually move through space ata speed several times the speed of light. b) A redshift occurs when a photon loses energy and slows down as itmoves through space. c) We see distant galaxies as they were billions or even tens of billions ofyears ago. d) We measure a redshift for roughly half of the galaxies that we observe, and for theothers we measure a blueshift. e) The center of the universe is located at a point about 200 Mpc from us in the centerof a cluster of galaxies.
A barometer can work because of a bimetallic strip
Indicate whether the statement is true or false
Stars in the same constellation
a. probably formed at the same time. b. must be part of the same cluster of stars in space. c. must have been discovered at about the same time at the same location in space. d. may actually be very different distances away from the observer and from each other.
The design of modern X-ray telescopes depends on:
A) lenses made of germanium. B) the prime focus design, with mirrors made of iron. C) grazing incidence optics. D) achromatic lenses to keep the X-rays in focus. E) the Cassegrain design, with mirrors made of lead.