Why do experts think that nuclear fusion energy might be more acceptable to the public than nuclear fission energy?
What will be an ideal response?
There have been, as of yet, no accidents with fusion energy, but there have been
several notorious accidents involving fission nuclear power stations. Further, there is a
considerable amount of both high and low-level radioactive waste produced by fission
plants, and the continuing controversy over where to store the spent fuel rods.
It is thought the only waste envisioned to come from fusion energy is tritium (from the
lithium blanket), which has a half-life of 12 years. Therefore, fusion energy (at least at first
blush) looks less threatening than fission energy.
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Plutonium has a half life of 2.4 × 104 years. How long does it take for 99.0% of the plutonium to decay?
A) 1.6 × 102 y B) 1.6 × 103 y C) 1.6 × 104 y D) 1.6 × 105 y E) 1.6 × 106 y
What is the net power that a person with surface area of 1.20 m2 radiates if his emissivity is 0.895, his skin temperature is 300 K, and he is in a room that is at a temperature of 290 K? The Stefan-Boltzmann constant is 5
67 × 10-8 W/(m2?K4). A) 60.3 W B) 62.6 W C) 65.7 W D) 68.4 W E) 64.8 W
What is a standard candle?
A) an object for which we are likely to know the true luminosity B) an object for which we can easily measure the apparent brightness C) a class of objects in astronomy that all have exactly the same luminosity D) any star for which we know the exact apparent brightness E) a long, tapered candle that lights easily
A rope is connected to a scale on the left and exerts a force 
and a rope is connected to the same scale on the right and exerts a force 
The scale shows a reading of 
= 120 N. The values of 
and 
are
a. 
b. 
c. 
d. 