If the average density of matter and energy in the Universe equals the critical density, space-time will be _____
A) finite
B) flat
C) positively curved
D) negatively curved
B
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The fresh newly created surfaces of icy satellites of Jovian planets
a. appear dark in color with few impact craters. b. appear dark in color with many impact craters. c. appear very bright because fresh ice is very reflective. d. generally show long bright grooves and a modest number of impact craters. e. generally have small volcanoes that are active.
One of the main reasons the Hubble Space Telescope was built and launched was to measure how fast the universe is expanding. If the expansion turns out to be faster than we thought, our estimate for the age of the universe will be
A) older (more time between now and the Big Bang). B) younger (less time between now and the Big Bang). C) unaffected.
If Q = 400 ?C and the potential difference VA ? VB = ?10 V in the circuit segment shown below, what is the current in the resistor?
a.
1.0 mA right to left
b.
1.0 mA left to right
c.
3.5 mA right to left
d.
3.5 mA left to right
e.
None of the above
Determine the temperature distribution through a uranium slab shown. Assume energy generation of 4,500 Btu/min?ft^3 and the slab is surrounded by water at 190ºF with a convective heat transfer coefficient of 450 Btu/hr?ft^2 ?ºF. Use a value of 21.96 Btu/hr?ft?ºF for thermal conductivity of uranium.
What will be an ideal response?