Most of the mass in the Milky Way Galaxy is located
A) in the gas and dust.
B) in the halo (above/below the disk).
C) in the central bulge of the galaxy.
D) within the disk.
E) in the stars in the spiral arms.
B
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The Moon's crust is thicker on the side facing Earth
a. True b. False Indicate whether the statement is true or false
This graph shows a light curve for a star. What can you conclude from this graph?
A) The star periodically dims and brightens, with a brightness peak about once a year. B) The star is orbited by a large planet. C) The star is about 100 times as bright as the Sun. D) The star is moving alternately toward and away from us.
Which of the following statements about the celestial equator is true at all latitudes?
A) It lies along the band of light we call the Milky Way. B) It represents an extension of Earth's equator onto the celestial sphere. C) It cuts the dome of your sky exactly in half. D) It extends from your horizon due east, through your zenith, to your horizon due west. E) It extends from your horizon due north, through your zenith, to your horizon due south.
A drive shaft running at 2500 rpm has outer diameter 60 mm and inner diameter 40 mm. The allowable shear stress in the shaft is 35 MPa. The maximum power that can be transmitted is approximately:
(A) 220 kW
(B) 240 kW
(C) 288 kW
(D) 312 Kw