What is the maximum value of the electric field E at 1.5 m from a 102-W light bulb radiating in all directions? (µ0 = 4? × 10^?7 T?m/A, c = 3.00 × 10^8 m/s)
a. 5.2E+1 V/m
b. 4.1E+3 V/m
c. 2.7E+3 V/m
d. 8.5E+2 V/m
e. 3.2E+2 V/m
a
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A polished aluminum plate 0.3 cm thick is used to partially shield against thermal radiation. Determine the shape factor between one side of the plate and the opposite side, if there are 1.2 cm diameter holes punched in the plate as shown in the figure.
Water at room temperature, 20°C, is pumped into a reactor core where it is converted to steam at 200°C. How much heat (in J) is transferred to each kilogram of water in this process? (csteam = 2 010 J/kg?°C; LV,steam = 2.26 × 103 J/g; 1 cal = 4.186 J.)
A. 3.35 × 105 B. 7.53 × 105 C. 2.67 × 106 D. 2.80 × 106 E. 3.01 × 106
A loop or sheet of gas hanging above an active region of the Sun is a(n) ________, often striking along the limb during total eclipses
A) sunspot B) flare C) aurora D) prominence E) granule
An ac generator consists of a coil with 40 turns of wire, each with an area of 0.06 m2
The coil rotates in a uniform magnetic field B = 0.4 T at a constant frequency of 55Hz. What is the maximum induced emf? A) 110 V B) 625 V C) 200 V D) 421 V E) 332 V