What are the Magellanic Clouds? What happened in the LMC in 1987?
What will be an ideal response?
The Magellanic Clouds are our companion galaxies in the deep southern sky, around 200,000 ly distant. They are much smaller, irregular galaxies, rich in gas, dust, and new star formation. One of the massive blue giants exploded as supernova 1987A.
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An elevator weighing 10,000. N is supported by a steel cable. Determine the tension in the cable when the elevator is accelerated upward at 3.0 m/s2. (g = 9.8 m/s2)
A) 40. kN B) 10. kN C) 7.0 kN D) 13. kN E) 11. kN
Orthoclase and plagioclase are the two major types of ______________
Fill in the blank(s) with correct word
Ocean waves with a wavelength of 120 m are coming in at a rate of 8 per minute. What is their speed?
a. 8.0 m/s b. 16 m/s c. 24 m/s d. 30 m/s e. 4.0 m/s
Two planes of charge with no thickness, A and B, are parallel and vertical. The electric field in the region between the two planes has magnitude 
. The electric field in the region to the left of A and the electric field in the region to the right of B may have the magnitudes
a.
0, 0.
b.
.
c.
,
d.
given in any answer above.
e.
given only in answer (a) or (b) above.