If a star exhibits no Doppler shift in its emitted light, it must be true that ________.
A. the star is neither moving toward nor away from Earth
B. the star is not moving relative to Earth
C. the star does not emit much visible light
D. the star only displays proper motion
Answer: A
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A concave mirror with focal length 16.0 cm is placed 45.0 cm to the left of the object. A convex lens of focal length 15.0 cm is placed 6.0 cm to the right of the object. Where is the image formed by both the mirror and the lens?
a. 9.5 cm to the right of the object b. 35.1 cm to the right of the lens c. 15.5 cm to the right of the object d. 37.9 cm to the right of the lens e. 16.0 cm to the right of the lens
A ventilation fan with a moment of inertia of 0.034 kg•m2 has a net torque of 0.11 N•m applied to it. If it starts from rest, what angular momentum will it have 9.0 s later?
a. 0.88 kg•m2/s c. 2.0 kg•m2/s b. 0.99 kg•m2/s d. 3.25 kg•m2/s
If the stars at the turnoff point of a cluster have a mass of 3M, what is the age of the cluster?
a. 3.0×10^10 years b. 3.3×10^9 years c. 6.4×10^8 years d. 1.6×10^11 years e. The age of a star cluster cannot be determined from the mass of stars at the turnoff point.
____________________ galaxies have a definite disk component, but contain no evidence of spiral pattern, few hot young stars, and little gas and dust
Fill in the blank(s) with correct word