Thermal Expansion: A large vat contains 1.000 L of water at 20°C. What volume will this water occupy when it is heated up to 80°C? Water has a volume expansion coefficient of 210 × 10-6 K-1.
A. 1.600 L
B. 1.013 L
C. 0.987 L
D. 0.9987 L
Answer: B
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In a lead-shot tower, spherical 0.95-cm-diameter BB shots are formed by drops of molten lead which solidify as they descend in cooler air. At the terminal velocity, i.e., when the drag equals the gravitational force, estimate the total heat transfer coefficient if the lead surface is at 171°C, the surface of the lead has an emissivity of 0.63, and the air temperature is 16°C. Assume CD = 0.75 for the first trial calculation.
GIVEN
• Spherical lead-shot falling through the air at terminal velocity
• Shot diameter (D) = 0.95 cm = 0.0095 m
• Lead surface temperature (Ts) = 171°C = 494 K
• Lead surface emissivity (?) = 0.63
• Air temperature (T?) = 16°C 289 K
• Assume CD = 0.75 for the first trial calculation FIND
• The total average heat transfer coefficient (htotal). ASSUMPTIONS
• The surroundings act as a black body enclosure at T?
SKETCH
A gamma-ray burster emits a quantity of energy similar to that emitted in a ________
Fill in the blank(s) with correct word
What are the two possible explanations for not seeing something glowing brightly along every line-of-sight?
I) The universe is infinite in size and infinitely old, but dust absorbs starlight from far away stars. II) The universe has a finite number of stars. III) The universe is changing in some way as to prevent us from seeing an infinite number of stars. A) I and III B) II and III C) I and II
Gas and dust distributed among the stars is known as the _______________
a. interstellar vacuum b. interstellar void c. Oort cloud d. interstellar medium