The _____ of quasars imply that they must be at great distances, some farther away than any known galaxy
A) large redshifts
B) small redshifts
C) large blueshifts
D) small blueshifts
A
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Tensile Stress and Strain: The graph in the figure shows the tensile stress as a function of the tensile strain in a certain wire. What does the slope of this graph give us for this wire?
A. the pressure in the wire B. Young's modulus for the material of the wire C. the tensile stress in the wire D. the tension in the wire E. the percent change in the length of the wire
Acceleration: Suppose that an object is moving with a constant velocity. Which statement concerning its acceleration must be correct?
A. The acceleration is constantly increasing. B. The acceleration is constantly decreasing. C. The acceleration is a constant non-zero value. D. The acceleration is equal to zero.
The focal length of a thin lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens?
A) f/4.0 B) f/2.0 C) f/5.6 D) f/0.30 E) f/0.40
Why do we call dark matter "dark"?
A) It blocks out the light of stars in a galaxy. B) It emits no radiation that we have been able to detect. C) It contains large amounts of dark-colored dust. D) It is dark brown or dark red in color.