Which geometrical shape has the least surface area for a given volume?
A) cube
B) pyramid
C) cylinder
D) sphere
E) none of the above
Answer: D
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A quantity of mercury occupies 400.0 cm3 at 0°C. What volume will it occupy when heated to 50°C? Mercury has a volume expansion coefficient of 180 × 10-6 K-1
A) 450 cm3 B) 409.7 cm3 C) 403.6 cm3 D) 401.8 cm3
One kilogram of chilled water (0°C) is placed in a freezer which is kept at 0°F (?18°C). Approximately how much electric energy (in kilocalories) is needed just to freeze the water if the room temperature is maintained at 75°F (24°C)? (Lice = 333 J/g; cice = 209 J/g/°C.)
a. 11 b. 15 c. 16 d. 13 e. 33
What prevents stars greater than about 100 times the Sun's mass from existing?
A) The rate of thermal expansion would overcome gravitational attraction leading to explosion. B) The gravitational attraction would overcome the rate of thermal expansion leading to a black hole. C) Fusion cannot take place at these higher mass levels. D) The gaseous material of the universe is too widely dispersed to allow for the formation of stars of this mass.
What is a transparent surface?
What will be an ideal response?