If the temperature of an iron sphere is increased,
A) its density will increase.
B) its volume will decrease.
C) its density will decrease.
D) its mass will decrease.
E) its density will remain unchanged.
Answer: C
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Radiation: What is the net power that a person with surface area of 1.20 m2 radiates if his emissivity is 0.895, his skin temperature is 27°C, and he is in a room that is at a temperature of 17°C? (? = 5.67 × 10-8 W/m2 ? K4)
A. 60.3 W B. 62.6 W C. 65.7 W D. 68.4 W E. 64.8 W
The average temperature over the past 1000 years has been about 15?C?C. From the graphs, you can conclude that Earth's average temperature during the past 800,000 years has
A. varied between about 7?C and 19?C B. stayed remarkable steady, never varying by more than about 2?C C. never been as high as it is today D. varied between about ??10?C and +4?C
G (big G) is not a(n) ______________, as g (little g) is
Fill in the blank(s) with correct word
The mass of matter is due mostly to its
1) protons 2) electrons while the volume of matter is due mostly to its 3) protons. 4) electrons. 5) none of these