What causes granulation on the photosphere?
a. bursts of energy
b. magnetic fields
c. solar cycle
d. differential rotation
e. convection
e
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A galvanometer has a coil with a resistance of 24.0 ?, and a current of 180 ?A causes it to deflect full scale. If this galvanometer is to be used to construct an ammeter that can read up to 10.0 A, what shunt resistor is required?
A) 123 µ? B) 234 µ? C) 342 µ? D) 432 µ? E) 423 µ?
A 100-? resistor is connected in series with a 10.0-mH inductor across an ac source operating at 1.00 kHz. What is the impedance of this circuit?
A) 100 ? B) 200 ? C) 1000 ? D) 236 ? E) 118 ?
About what percentage of the mass of the solar nebula consisted of elements other than hydrogen and helium?
A) 0 percent B) 0.1 percent C) 2 percent D) 20 percent E) 80 percent
Your company has developed a new polymer, and you are asked to determine
(a) its elastic modulus and (b) its viscosity. To measure these properties, you choose to conduct a stress-relaxation test at 300 K. At 300 K a specimen of the new polymer is strained at t=0 by an amount of 3×10-3, and this requires an initial stress of 6×106 Pa. This strain is constant for 100 hours, and the stress on the polymer has dropped to 3×106 Pa. Assume that this polymer can be modeled as a Maxwell solid, with the viscous component behaving as a Newtonian fluid.