Which of the following describes parallax?
A) It is best measured over exactly one year intervals.
B) It is inversely proportional to the distance to the star.
C) It was first observed by Galileo with his new telescope.
D) It is only applicable to objects within the solar system.
E) It is more accurate as the distances to objects becomes greater.
B
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When a thin copper wire that is 178 m long is connected between a 1.2-V potential difference, a current of 2.0 amps flows through the wire. What is the diameter of this wire? The resistivity of copper is 1.72 × 10-8 ? ? m
What will be an ideal response?
When we see Venus in its full phase, what phase would Earth be in as seen by a hypothetical Venetian?
A) waning crescent B) new C) third quarter D) first quarter E) full
A double-concave lens has equal radii of curvature of 15.1 cm. An object placed 14.2 cm from the lens forms a virtual image 5.29 cm from the lens. What is the index of refraction of the lens material?
A) 1.90 B) 1.98 C) 1.82 D) 1.77
It is possible to detect Doppler shifts due to light on each side of a rapidly spinning star. Suppose it is seen that a nearby star, relatively stationary to us, is blueshifted in light on one side of the star and redshifted in the light from the other side. Suppose a star of radius 
km has light shifted from 525 nm to 527 nm on one side and to 523 nm on the other. What is the rotational period of the star?
A. 34 h B. 32 h C. 24 h D. 16 h