If the average density of matter and energy in the Universe is more than the critical density, space-time will be _____
A) closed
B) flat
C) open
D) infinite
A
You might also like to view...
About what percentage of the mass of the solar nebula consisted of hydrogen and helium gas?
A) 0.5 percent B) 5 percent C) 50 percent D) 98 percent E) 100 percent
The heat of fusion of lead is 5.9 kcal/kg, the heat of vaporization is 207. cal/kg, and its melting point is 328°C. How much heat is required to melt 50. g of lead initially at 23°C? (The specific heat of lead is 0.031 kcal/kg-C°.)
What will be an ideal response?
A person has a thermal conductivity of 0.18 W/m·K between his inner core and his skin with an effective shell thickness of 1.30 cm between his core and skin. If his inner core is at the normal 98.6°F, and his skin has a surface area of 1.62 m2, what will be his rate of loss of thermal energy due to conduction through his skin if his skin temperature is 28.3°C?
a. 150 W b. 158 W c. 316 W d. 195 W e. 254 W
The Paleozoic era began about how many million years ago?
a. 65 b. 545 c. 245 d. 3