An astronomical telescope has an objective of diameter 20 cm with a focal length of 180 cm. The telescope is used with an eyepiece of focal length 30 mm. What is the angular magnification of this telescope?
A) 360 x
B) 60 x
C) 540 x
D) 6 x
E) 180 x
B
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A(n)__________is a rule that the strength of an effect (such as gravity) decreases in proportion as the distance squared increases
A) parallel square relation B) inverse square relation C) direct square relation D) proportionate square relation
The area under the force-displacement curve represents:
a. area. b. work. c. force. d. coefficient of static friction.
You want to find a mass of a star on the main sequence of the H-R diagram. What do you need?
a. The star has to be in a visual binary. b. The star has to be in a spectroscopic binary. c. You need the star's luminosity. d. You need the star's absorption spectra.
Ref. 210 suggests that natural gas should be used to produce motor fuels. Discuss the reasonableness of this proposal, given that this is feasible
What will be an ideal response?