What is the main factor that drives Darwinian evolution?
A) the competition for finite resources
B) the need to have sex
C) the ability of an organism to harness the energy of the Sun
D) the size of an organism
A
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Estimation: A reasonable estimate for the duration of a typical physics lecture is
A. 600 s. B. 1000 s. C. 3500 s. D. 10,000 s.
Coulomb's Law: Two point charges q = -8.50 µC are fixed 10.0 cm apart along a horizontal bar, as shown in the figure. Their electrical forces will be used to balance the weight of a very small sphere carrying a charge Q = + 15.0 ?C, 10.0 cm from each of them in a place where g = 9.80 m/s2. What is the greatest mass M this sphere can have without falling? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
Fill in the blank(s) with the appropriate word(s).
According to Newton’s 2nd Law
A. If the force is doubled and the mass remains the same the acceleration will halve. B. If the force is doubled and the mass remains the same the acceleration will double. C. If the force is doubled and the mass remains the same the acceleration will increase by a factor of 4. D. If the force is doubled and the mass remains the same the acceleration will decrease by one-fourth.
Mercury's magnetic field is thought to be due to:
A) dynamo action, like the Earth's magnetic field. B) a mechanism entirely unique to Mercury. C) being close to the Sun. D) being a fossil remnant dating back to the distant past when the core was more liquid.