What is the net power that a person with surface area of 1.20 m2 radiates if his emissivity is 0.895, his skin temperature is 300 K, and he is in a room that is at a temperature of 290 K? The Stefan-Boltzmann constant is 5
67 × 10-8 W/(m2?K4). A)
60.3 W
B)
62.6 W
C)
65.7 W
D)
68.4 W
E)
64.8 W
B
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The _____ of active galactic nuclei (AGN) is an attempt to explain the different types of AGN using a single model viewed from different directions
A) hierarchical model B) hybrid hierarchical model C) monolithic model D) unified model
A binary star is a pair of stars that orbit around each other. By detecting this orbital motion, and using Kepler's laws and the law of gravitation, one can directly measure the stars' ________.
A. temperatures B. masses C. luminosities D. distances
Plane waves of ultrasound, f = 51.0 kHz, impinge on a flat plane with a 1.00 cm-wide slit. What is the total angular width (2q) of diffracted sound waves when the speed of sound in air is 340 m/sec
a. 167° b. 83.6° c. 19.5° d. 41.8° e. 0.11°
Refer to the dipole in the z, w coordinate system. Consider the electric field at a point ? out on the z-axis, above and to the right of the intersection of the axes. In which direction does the electric field point at point ??
A. 45° down and to the left, parallel to the z-axis: 
B. 45° down and to the right, parallel to the w-axis: 
C. 45° up and to the right, parallel to the z-axis: 
D. 45° up and to the left, parallel to the w-axis: 