A solid metal sphere is 15.0 cm in diameter and has surface of uniform color. When its surface is at 112°C, you measure that it radiates energy at a rate of 71.3 W. What is the emissivity of the surface of this object?
Any heat that enters the sphere from the outside environment is negligible. The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 · K4.
What will be an ideal response?
Answer: 0.810
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In general, Population I stars are ________ than Population II stars.
A. the same age B. younger C. older D. sometimes older, and sometimes younger
Again consider the scenario from the previous problem: A sprinter named Ben has challenged a beam of light to a race in the 100-meter dash. The race is held in a stadium full of spectators
At the start signal, a laser beam is turned on at the start line, pointed down the track. At the same instant, Ben bursts out of the starting blocks at 99% of the speed of light (0.99c). According to Ben, what happens? A) The light beam gradually pulls ahead of him and wins the race because it is going 1% of the speed of light faster than him. B) The light beam instantly finishes the race, before Ben even has a chance to start. C) The light beam moves out ahead of him at the full speed of light, winning the race easily. D) Ben wins the race and becomes a hero.
Researchers estimate that there is more total mass in the Kuiper Belt than in the asteroid belt
Indicate whether the statement is true or false
Why are smaller terrestrial bodies such as Mercury or the Moon “geologically dead”?
a. They cooled off faster than Earth did. b. They don’t have erosion. c. They were hit by fewer meteorites than Earth. d. They are made of different materials than Earth.