You observe a distant galaxy. You find that a spectral line of hydrogen that is shifted from its normal location in the visible part of the spectrum into the infrared part of the spectrum. What can you conclude?
A) The galaxy is moving away from you.
B) The galaxy is moving toward you.
C) The galaxy has weak gravity.
D) The galaxy is made purely of hydrogen.
A) The galaxy is moving away from you.
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Compound Microscope: A compound microscope has a 18-cm-long barrel and an objective lens with a focal length of 8.0 mm. What is the focal length of the eyepiece to give a total magnification of 240? It is adjusted for minimum eyestrain for persons with a near point of 25 cm.
A. 1.3 m B. 1.5 cm C. 1.9 cm D. 2.1 cm E. 2.3 cm
A conducting sphere of radius 20.0 cm carries an excess charge of +15.0 µC, and no other charges are present. (k = 1/4??0 = 8.99 × 109 N ? m2/C2) The potential (relative to infinity) due to this sphere at a point 12.0 cm from its center is closest to
A) zero. B) 674 kV. C) 1130 kV. D) 3380 kV. E) 9380 kV.
On a computer, a megabyte of memory is ______________ bytes
Fill in the blank(s) with correct word
What is currently included in the study of
geology? a)only investigations involving rocks and minerals b)only data on the structure and composition of Earth c)investigation of the composition, structure, and history of all planets and moons in our solar system d)all studies of matter in any form throughout the entire universe