RMS and Peak Quantities: The current through a 50-? resistor is I = (0.80 A) sin(240t), where t is measured in seconds. What is the rms current?
A. 0.57 A
B. 0.80 A
C. 1.1 A
D. 1.6 A
Answer: A
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Energy transport by ____________________ is important when photons cannot readily travel through a gas
Fill in the blank(s) with correct word
According to current science, why didn't oxygen begin to accumulate in the atmosphere for more than a billion years after life appeared on the Earth?
A) Oxygen released by life was removed from the atmosphere by chemical reactions with surface rocks until the surface rock could absorb no more. B) Early forms of animal life consumed the oxygen released by plants during the first billion years of life on Earth. C) Early life did not release oxygen, and oxygen-releasing organisms didn't evolve for a billion years after the earliest life. D) Oxygen released by life was removed from the atmosphere by dissolving in the ocean until the oceans could dissolve no more.
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 normal stress acting perpendicular to the weld is approximately:
(A) 39 MPa
(B) 48 MPa
(C) 78 MPa
(D) 84 MPa
Why was Herschel's strategy for mapping our Galaxy flawed?
A) His infrared telescopes couldn't penetrate the dust clouds. B) He used globular clusters, lying above the dust in the disc. C) He relied on visual wavelengths, which are obscured by dust. D) He used radio telescopes that didn't give enough resolution. E) He assumed Earth was at the extreme edge of the Galaxy.