Resistor A has twice the resistance of resistor B. When individually connected across a given potential difference, which one dissipates the most power; and when connected in series across the same potential difference, which one dissipates the most power?
a. A, A
b. A, B
c. B, B
d. B, A
d
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A spherical rock has a density of 3 g/cm3. If another rock has the same mass but is twice as wide, its density must be ________ g/cm3.
A. 6 B. 3/8 C. 3/4 D. 3/2
A piece of wood 350 mm × 350 mm and 15 mm thick conducts heat through its thickness under steady state conditions. The rate of heat flow is measured to be 14.0 watts when the temperature difference is 28 C°
Determine the coefficient of thermal conductivity for this wood A) 9.2 × 10-4 J/(m?s?C°) B) 270 J/(m?s?C°) C) 16 J/(m?s?C°) D) 0.061 J/(m?s?C°) E) 33 J/(m?s?C°)
A brick and a feather fall to the Earth at their respective terminal velocities. Which object experiences the greater force of air friction?
A) Neither, both experience the same amount of air friction force. B) the brick C) the feather
A steel sphere sits on top of an aluminum ring. The steel sphere (a = 1.10 × 10^-5/°C) has a diameter of 4.0000 cm at 0°C. The aluminum ring (a = 2.40 × 10^-5/°C) has an inside diameter of 3.9900 cm at 0°C. Closest to which temperature given will the sphere just fall through the ring?
a. 462°C c. 116°C b. 193°C d. 57.7°C