What is meant by neutrino oscillations?
a. oscillating movement of neutrinos
b. one neutrino type (e.g., muon neutrinos) changing into another (e.g., tau neutrinos)
c. random changes in mass of neutrinos
d. none of the above
B
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How does an object’s rate of cooling vary with size?
a. A larger object cools more slowly than a smaller object. b. A smaller object cools more slowly than a larger object. c. Size has no effect on an object’s rate of cooling.
Why do we think that DNA was probably NOT the first self-replicating molecule?
A) it is able to replicate using carbohydrates rather than proteins B) it is far to complex to have been the first self-replicating molecule C) it is able to replicate at high temperatures found near deep ocean vents D) laboratory have shown that it is able to catalyze its own replication
A cart of weight 60 N is accelerated across a level surface at 0.15 m/s2 . What net force acts on the cart? (g = 9.8 m/s2)
a. 0.92 N c. 3.0 N b. 0.31 N d. 4.5 N
A proton and an alpha particle are moving perpendicular to a uniform magnetic field with the same speeds. If the velocity of the proton is at an angle of 20° with respect to the magnetic field direction, at what angle to the magnetic field direction would the alpha particle be moving if it experiences the same magnitude magnetic force as the proton? The alpha particle has 4 times the mass of the
proton and twice its charge. a. 10° c. 43° b. 62° d. 9.8°