A brass rod of length L 5 0.75 m is twisted by torques T until the angle of rotation between the ends of the rod is 3.58. The allowable shear strain in the copper is 0.0005 rad. The maximum permissible diameter of the rod is approximately:
(A) 6.5 mm
(B) 8.6 mm
(C) 9.7 mm
(D) 12.3 mm
(D) 12.3 mm
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What range of electromagnetic radiation is emitted when transitions from higher levels into n = 1 occur in a hydrogen atom?
A) Visible B) Infrared C) Microwave D) X-Ray E) Ultraviolet
An electron which moves with a speed of 4.5 × 10^4 m/s perpendicular to a uniform magnetic field of 0.57 T experiences a force of what magnitude? (e = 1.6 × 10^?19 C)
a. zero b. 6.57E–33 N c. 2.05E–15 N d. 1.26E–14 N e. 4.10E–15 N
Resistor A has twice the resistance of resistor B. When individually connected across a given potential difference, which one dissipates the most power; and when connected in series across the same potential difference, which one dissipates the most power?
a. A, A c. A, B b. B, B d. B, A
The law of ________________ states that energy must flow from _________ temperature regions to __________ temperature regions
Fill in the blank(s) with correct word