On a hot day, you open the refrigerator and experience a refreshing feeling when the cool air comes in contact with your body
You think to yourself "I think that I'll just keep the refrigerator door open and stand in front of the refrigerator all day today to stay cool. I might even bring a chair." Will this work? Explain why or why not.
This will not work because the refrigerator discharges the heat removed from the refrigerator plus the work done by the compressor into the kitchen. Thus, in the long run, the net effect is to heat up the kitchen.
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Nuclear Fission and Fusion: When 235U undergoes fission, the average energy per fission event is 200 MeV. How much energy is released in the total fission of 2.0 g of 235U? (1 eV = 1.60 × 10-19 J, mneutron ? mproton = 1.67 × 10-27 kg)
A. 1.6 × 1011 J B. 3.9 × 1013 J C. 1.6 × 105 J D. 3.9 × 1010 J
What unusual discovery was made about the Murchison Meteorite?
A) It is from Mars. B) It contains iron. C) It contains living cells. D) It contains amino acids. E) It is the largest known meteorite.
The origin of the glow from the filament inside the ac incandescent lamp in your bedroom is
A) electrons resupplied by the wall outlet. B) electrons already in the filament. C) the positive charges that flow in the filament. D) resistance in the filament.
A simple pendulum and a mass oscillating on an ideal spring both have period T in an elevator at rest. If the elevator now moves downward at a uniform 2 m/s, what is true about the periods of these two systems?
A) Both periods would remain the same. B) Both periods would increase. C) Both periods would decrease. D) The period of the pendulum would increase but the period of the spring would stay the same. E) The period of the pendulum would decrease but the period of the spring would stay the same.