A 15-?F capacitor and a 30-?F capacitor are connected in series, and charged to a potential difference of 50 V. What is the resulting charge on the 30-?F capacitor?
A. 0.70 mC
B. 0.80 mC
C. 0.50 mC
D. 0.60 mC
E. 0.40 mC
Answer: C
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How long does it take for a train traveling 60.4 miles per hour to travel 81 miles?
A) 0.75 hours B) 0.745 hours C) 1.34 hours D) 1.3 hours E) 1 hour
A flat rectangular coil with dimensions of 8.0 cm × 10 cm is dropped from a zero magnetic field position into a 1.4-T magnetic field in 0.10 s
The coil has 60 turns and is perpendicular to the magnetic field. What is the average induced emf in the coil as a result of this action? A) 8.6 V B) 2.4 V C) 6.7 V D) 3.6 V E) 0 V
A girl is standing in front of a concave mirror. Consider two rays of light, one from her nose and one from her mouth that are parallel as they are traveling toward the mirror. These rays will come together:
a. at the focal point. b. at the center of curvature. c. at the image point. d. behind the mirror if she is too close to the mirror.
Determine the steady-state temperatures of two radiation shields placed in the evacuated space between two infinite planes at temperatures of 555 K and 278 K. The emissivity of all surfaces is 0.8.
GIVEN
-Two radiant shields placed in the evacuated space between two infinite planes
-Temperature of the planes
-T1 = 555 K
-T4 = 278 K
-Emissivity of all surface (?) = 0.8
FIND
-The steady state temperatures of the shields (T2, T3)
ASSUMPTIONS
• All surfaces are gray and diffuse
SKETCH
