A blacksmith is flattening a steel plate having dimensions 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75,
at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings. (? = 5.67 × 10-8 W/m2 ? K4 )
A) 360 W
B) 760 W
C) 790 W
D) 850 W
E) 880 W
D
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Explain how Newton could turn observations of a cannonball in flight into a satellite orbit
What will be an ideal response?
Relative to a stationary observer, a moving clock
A) always runs slower than normal. B) always runs faster than normal. C) keeps its normal time. D) can do any of the above. It depends on the relative velocity between the observer and the clock. E) can do any of the above. It depends on the relative energy between the observer and the clock.
Compare the Copernican principle with the assumptions of mediocrity
What will be an ideal response?
__________ in an x-ray spectrum of an atom occurs because of rapid deceleration of the bombarding electrons
Fill in the blank(s) with correct word