What is the wavelength of peak emission for a black body at 37°C? (c = 3.0 × 108 m/s, Wien displacement law constant is 2.9 × 10-3 m • K, ? = 5.67 × 10-8 W/m2 • K4 )
A) 29 µm B) 94 µm C) 7.8 µm D) 9.4 µm E) 78 µm
D
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The inductance of a solenoid 16.0 cm long with a cross-sectional area of 1.00 × 10-4 m2 is 1.00 mH. How many turns of wire does this solenoid have?
A) 318,000 B) 159,000 C) 1130 D) 282 E) 150
RMS and Peak Quantities: The current through a 50-? resistor is I = (0.80 A) sin(240t), where t is measured in seconds. What is the rms current?
A. 0.57 A B. 0.80 A C. 1.1 A D. 1.6 A
The initial speed of a cannon ball is 0.20 km/s. If the ball is to strike a target that is at a horizontal distance of 3.0 km from the cannon, what is the minimum time of flight for the ball?
a. 16 s b. 21 s c. 24 s d. 14 s e. 19 s
Which internal heat source still generates heat within the terrestrial worlds today?
A) heat of accretion B) heat from differentiation C) heat from convection D) heat from radioactive decay