When salt is introduced to ice, the temperature at which melting occurs is
A) quite unaffected.
B) lowered.
C) increased.
D) dependent on the shape of salt and ice crystals
Answer: B
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A person is declared to be dead upon the irreversible cessation of spontaneous body functions: brain activity, or blood circulation and respiration. However, only about 1% of a person's cells have to die in order for all of these things to happen. How can someone be dead when 99% of his or her cells are still alive?
What will be an ideal response?
If a million asteroids 1-kilometer across were all combined into one object, how big would it be across? (Hint: You can assume that both asteroids and the final object are spherical. The equation for the volume of a sphere is 43?r3 where r is the radius.)
If a million asteroids 1-kilometer across were all combined into one object, how big would it be across? (Hint: You can assume that both asteroids and the final object are spherical. The equation for the volume of a sphere is 43?r3 where r is the radius.)
The neutral pion decays by 
The rest mass of the neutral pion is 135 MeV/c2. What is the energy of each of the photons if the pion is at rest when it decays?
A. 270 MeV B. 135 MeV C. 67.5 MeV D. 1.02 MeV E. This decay cannot happen.
When a funnel cloud touches the ground, it becomes a
A) hurricane. B) thunderstorm. C) tornado. D) cyclone.