Blackbody radiation is from a body that
A)
does not emit radiation in the visible.
B)
is black.
C)
deflects all radiation falling on it.
D)
absorbs all radiation falling on it.
E)
is actually white.
D
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We drop a stone of mass m from a height h into a bucket of water. What would be a suitable replacement process for this non-quasistatic process?
A. Lower the stone gently into the water. B. Lower the stone gently into the water, and then heat the water until it has mgh more energy than it had before. C. Lower the stone gently into the water, and then stir the water gently to give it mgh more energy. D. Raise the water up to height h, gently put the stone in it, and then lower both back to the ground. E. Either (B) or (C). F. None of the above.
What is the source of Jupiter's intense magnetic field?
A) Charged particles trapped in Jupiter's solid iron core similar to Earth B) Liquid metallic hydrogen swirling in the rapidly spinning mantle C) The ionized sulfur ejected into a torus around Jupiter by Io D) The auroral displays in the polar regions, just like with the Earth E) A liquid iron and nickel outer core, just like the Earth's magnetic field
A cast iron frying pan ¼ inch thick is used to prepare some food on a stove top. If the lower surface of the pan is at 600ºF and the upper surface is 500ºF, estimate the heat transfer through the pan per unit area.
What will be an ideal response?
A 1200-kg car is being raised with a constant acceleration of 2.53 m/s2 by a crane, using a 20-m long steel cable, 1.5 cm in diameter. Young's modulus for steel is 20 × 1010 N/m2. What is the change in length of the cable?
A) 8.4 mm B) 8.4 cm C) 4.9 mm D) 4.9 cm E) 4.9 m