How much heat is necessary to change 10 g of water at 30°C into steam at 100°C?
a. 0.07 kcal
b. 0.7 kcal
c. 6.1 kcal
d. 0.67 kcal
c
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Star X has an apparent magnitude of 3, and star Y has an apparent magnitude of 13. How do they compare in observed brightness?
A) Star Y is 10,000 times brighter than star X. B) Star X is 10,000 times brighter than star Y. C) Star Y is 10 times brighter than star X. D) Star X is 10 times brighter than star Y.
Addition by 1. Components: Vector 
has a magnitude of 6.0 m and points 30° south of east. Vector 
has a magnitude of 4.0 m and points 30° west of south. The resultant vector 
+ 
is given by
A. 7.2 m at an angle of 64° south of east. B. 3.3 m at an angle of 64° south of east. C. 9.8 m at an angle of 26° south of east. D. 9.8 m at an angle of 64° south of east. E. 3.3 m at an angle of 26° south of east.
Which group contains only features that can be seen on the surface of Mars?
A. craters, canyons, polar caps, volcanoes B. polar caps, oceans, dried up riverbeds C. canyons, oceans, volcanoes, polar caps D. All of these choices are correct.
The phase of the Moon that one observes on the overhead meridian at 10 P.M. local time is a ______________ moon
a. waxing crescent b. waning crescent c. waxing gibbous d. waning gibbous