For a certain ideal Carnot engine, the hot reservoir is 35 C° higher than the cold reservoir. If this engine is to have an efficiency of 20%, what must be the temperature of the hot reservoir?
A) 245 K B) 175 K C) 140 K D) 70.0 K E) 210 K
B
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A neutron star is
A) the remains of a star that died in a massive star supernova (if no black hole was created). B) the remains of a star that died by expelling its outer layers in a planetary nebula. C) a star made mostly of elements with high atomic mass numbers, so that they have lots of neutrons. D) an object that will ultimately become a black hole.
The most abundant molecule in molecular clouds is
A) H2. B) He2. C) CO. D) H2O. E) HHe.
Consider the fission reaction:
U + n ? 2 fission products + 2 n's (a) Estimate the energy released in the reaction. (b) If 3 neutrons had been released instead of 2, what energy would have been released?
What is the phase angle between the voltages of the inductor and capacitor in a RLC series circuit?
A) 0° B) 45° C) 90° D) 180° E) 270°