Electricity and magnetism connect to form
A. mass
B. light
C. ultra high-frequency sound
D. energy
Answer: B. light
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A thin-walled cylindrical tank with a diameter of 200 mm has an internal pressure of 11 MPa. The yield stress in tension is 250 MPa, the yield stress in shear is 140 MPa, and the factor of safety is 2.5. The mini-mum permissible thickness of the tank is approximately:
(A) 8.2 mm (B) 9.1 mm (C) 9.8 mm (D) 11.0 mm
Impedance: What resistance must be put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40,000 ??
A. 45 k? B. 40 k? C. 37 k? D. 26 k?
Why do some of the bright stars (such as the one indicated by the arrow) in this photo have cross-shaped spikes over them?
A) The spikes are an artifact of photography through a telescope. B) The spikes are flares ejected from the surfaces of bright stars. C) Very bright stars tend to be slightly nonspherical in shape and therefore look like they have spikes in photos. D) The stars with spikes are actually binary star systems.
Which of the following individuals did not directly contribute to quantum theory?
A. Schrödinger B. Einstein C. Heisenberg D. Planck E. Roentgen