A binary star system in the constellation Orion has an angular separation between the stars of 10-5 radians. Assuming a wavelength of 700 nm, what is the smallest aperture (diameter) telescope that will just resolve the two stars? (1 nm = 10-9 m)
a. 8.5 cm
c. 6.1 cm
b. 4.2 cm
d. 3.0 cm
A
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Some young star clusters contain large numbers of protostars
a. True b. False Indicate whether the statement is true or false
Capacitors in Combination: A 5.0-?F capacitor and a 7.0-?F capacitor are connected in series across an 8.0-V potential source. What is the potential difference across the 5.0-?F capacitor?
A. 0 V B. 8.0 V C. 2.7 V D. 3.6 V E. 4.7 V
Which of the following correctly describes the relationship between Newton's theory of gravity and general relativity?
A) Newton's theory of gravity is now known to be false, and we were previously misled to think it was true by measurement errors. B) Newton's theory of gravity and general relativity give the same answers, but the former tells us to think of gravity as a force and the latter tells us to think of gravity as curvature of spacetime. C) Newton's theory of gravity is an approximation to general relativity that works when gravity is relatively weak, but breaks down when gravity is strong. D) General relativity applies at the sub-atomic level, but Newton's theory of gravity does not.
A mountain climber encounters a crevasse in an ice field. The opposite side of the crevasse is a height h lower, and is separated horizontally by a distance w
To cross the crevasse, the climber gets a running start and jumps in the horizontal direction. If the height of the crevasse increases but the width remains the same, then, A) the minimum speed needed to cross the crevasse increases. B) the minimum speed needed to cross the crevasse decreases. C) the minimum speed needed to cross the crevasse stays the same D) the minimum speed needed to cross the crevasse will depend on the mass of the mountain climber. E) the minimum speed needed to cross the crevasse will depend on the weight of the mountain climber.