A particle (q = 5.0 nC, m = 3.0 mg) moves in a region where the magnetic field has components Bx = 2.0 mT, By = 3.0 mT, and Bz = -4.0 mT. At an instant when the speed of the particle is 5.0 km/s and the direction of its velocity is 120° relative to the magnetic field, what is the magnitude of the acceleration of the particle?
a. 33 m/s2
b. 17 m/s2
c. 39 m/s2
d. 25 m/s2
e. 45 m/s2
C
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The two most abundant elements in the sun are
a. nitrogen and oxygen. b. hydrogen and helium. c. sulfur and iron. d. carbon and hydrogen. e. carbon and nitrogen.
GIVEN ? A disk rotating in air ? Diameter (D) = 2 m ? Rotational speed (?) = 600 rev/min ? Air temperature (T?) = 20°C ? Surface temperature (Ts) = 50°C FIND ? The rate of heat transfer from one side (q) ASSUMPTIONS ? The heat transfer has reached steady state ? The disk is horizontal ? Air is still SKETCH
GIVEN
? A disk rotating in air
? Diameter (D) = 2 m
? Rotational speed (?) = 600 rev/min
? Air temperature (T?) = 20°C
? Surface temperature (Ts) = 50°C
FIND
? The rate of heat transfer from one side (q)
ASSUMPTIONS
? The heat transfer has reached steady state
? The disk is horizontal
? Air is still
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 28, for dry air at the mean temperature of 35°C
How do we learn about Earth’s core, mantle, and crust?
a. magnetic field studies b. seismic waves c. x-ray imaging d. all of the above e. a and b
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.