Explain how a black surface such as the Solar Two tower can appear white
What will be an ideal response?
Black surfaces absorb the radiation incident on them. If the radiation is too
intense, it overwhelms the surface and the majority can be reflected. In this case, it can
appear white.
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A 1.5-kg playground ball is moving with a velocity of 3.0 m/s directed 30° below the horizontal just before it strikes a horizontal surface. The ball leaves this surface 0.50 s later with a velocity of 2.0 m/s directed 60° above the horizontal. What is the magnitude of the average resultant force on the ball?
a. 14 N b. 11 N c. 18 N d. 22 N e. 3.0 N
Aluminum alloys such as 2024 and 7050 _________ recommended for welding.
Fill in the blank(s) with the appropriate word(s).
A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 225 grams of ice melts in 1 hour, how much heat energy per second is passing through the walls of the container? (The heat of fusion of ice is 3.33 × 10^5 J/kg)
What is the phase angle of an AC series circuit that is constructed of a 14.5-? resistor along with 16.5-? inductive reactance and 9.41-? capacitive reactance?
a. 26.1° b. 11.9° c. 43.1° d. 35.0° e. 38.7°