The biggest reason why heat engines are far from 100% efficient is
A) gravitational forces.
B) the second law of thermodynamics.
C) gremlins.
D) the first law of thermodynamics.
E) friction.
B
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Iron is passivated by the addition of _________in stainless steel.
Fill in the blank(s) with the appropriate word(s).
Radioactive Decay: The unstable isotope 234Th decays by ? emission with a half-life of 24.5 days. If the initial decay rate of the sample is 6.2 × 1017 Bq, what is the decay rate after 37 days?
Fill in the blank(s) with the appropriate word(s).
What problem does adaptive optics correct?
A) Defects in the optics of the telescope, such as the original Hubble mirror B) The opacity of the Earth's atmosphere to some wavelengths of light C) The light pollution of urban areas D) Turbulence in the Earth's atmosphere which creates twinkling E) Chromatic aberration due to use of only a single lens objective
Suppose we want a satellite to revolve around the earth 5 times a day. What should be the radius of its orbit? (The mass of the earth is 5.97 × 1024 kg, G = 6.67 × 10-11 N ? m2/kg2, and you can neglect the presence of the moon.)
A) 0.690 × 107 m B) 7.22 × 107 m C) 1.44 × 107 m D) 2.11 × 107 m