Modern astronomers suspect the corona is heated by
a. shock waves rising from below the photosphere.
b. the solar wind.
c. magnetic carpets.
d. shock waves rising from below the photosphere, the solar wind, and the solar magnetic field.
e. none of the others.
c
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An L-shaped beam is loaded as shown in the figure. The bending moment at the midpoint of span AB is approximately:
(A) 6.8 kN?m
(B) 10.1 kN?m
(C) 12.3 kN?m
(D) 15.5 kN?m
If you confine an electron to a box and know that the uncertainty in the electron's speed is 65 m/s,
what is the smallest length that the box could have? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s) A) 8.4 × 10-6 m B) 1.1 × 10-5 m C) 1.8 × 10-5 m D) 5.8 × 10-6 m E) 1.8 × 10-6 m
The _____ of an object is the angular distance from one edge to the other
A) angular volume B) angular momentum C) angular velocity D) angular diameter
Compared to optical telescopes, radio telescopes are built large because
A) radio waves have very long wavelengths. B) radio waves are absorbed by the atmosphere. C) atmospheric turbulence is more of a problem. D) they're less expensive to make than optical telescopes. E) radio sources are harder to find.