A 4.0-M? resistor is connected in series with a 0.50-?F capacitor. The capacitor is initially uncharged. The RC combination is charged by a 9.0-V battery. What is the change in voltage between t = RC and t = 3RC?
A)
15 V
B)
11 V
C)
7.6 V
D)
5.7 V
E)
2.9 V
E
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A cylindrical tank is assembled by welding steel sections in a helical pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The circumferential strain in the wall of the tank is approximately:
(A) 1.9 3 1024
(B) 3.2 3 1024
(C) 3.9 3 1024
(D) 4.5 3 1024
When railroad tracks make a curve, the outer track is longer. This means a wheel that rides on the outer track needs to somehow
A) roll slower than the wheel on the inner track. B) maintain the same speed as the wheel on the inner track. C) roll faster than the wheel on the inner track.
Angular distance from the horizon to the south celestial pole always equals your latitude
a. True b. False Indicate whether the statement is true or false
The full Moon is brighter than Venus regardless of how bright Venus is in the sky on any night as viewed from Earth
a. True b. False Indicate whether the statement is true or false