What can we infer, at least roughly, from a star's luminosity class?
A) its size (radius)
B) its mass
C) its age in years
D) its surface temperature
A) its size (radius)
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We know that the numbers of stars _________ from _______ to ________ on the H-R diagram
a. increases, upper right, lower left b. decreases, upper left, lower right c. increases, upper left, lower right d. decreases, upper right, lower left
An ac signal at a certain frequency is applied across a 40-mH inductor and a 100-? resistor. If the power factor of this circuit is 0.40, what is the value of the frequency?
A) 160 Hz B) 200 Hz C) 410 Hz D) 600 Hz E) 910 Hz
Which of the following statements is true of Kuiper Belt Objects?
A) They are associated with the Jovian planets. B) Most of them are composed of liquid helium. C) Some of them have moons of their own. D) They are found in regions surrounding Jupiter's orbit.
An aluminum bar of diameter d 5 52 mm is twisted by torques T1 at the ends. The allowable shear stress is 65 MPa. The maximum permis-sible torque T1 is approximately:
(A) 1450 N?m
(B) 1675 N?m
(C) 1710 N?m
(D) 1800 N?m