Stare at a red wall for a few minutes and then gaze at a white wall. Due to retina fatigue you see
A) more red.
B) cyan.
C) black.
Answer: B
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Energy in Nuclear Reactions: Two deuterium nuclei, 
H, fuse to produce a tritium nucleus, 
H, plus an ordinary hydrogen nucleus, 
H. A neutral deuterium atom has a mass of 2.014102 u; a neutral tritium atom has a mass of 3.016050 u; a neutral hydrogen atom has a mass of 1.007825 u; a neutron has a mass of 1.008665 u; and a proton has a mass of 1.007277 u. How much energy is released in this fusion process? (1 u = 931.5 MeV/c2)
A. 3.03 MeV B. 3.53 MeV C. 4.03 MeV D. 4.53 MeV E. 6.58 MeV
Buoyancy: What buoyant force does a 0.60-kg solid gold crown experience when it is immersed in water? The density of gold is 19.3 × 103 kg/m3 and that of water is 1000 kg/m3.
A. 3.0 × 10-5 N B. 3.0 × 10-4 N C. 3.0 × 10-2 N D. 0.30 N
A body travels at an initial speed of 2.5 m/s. Given a constant acceleration of 0.2 m/s2, what is the speed of the body at time 25 seconds later?
A. 7.5 m/s. B. 3.4 m/s. C. 3.6 m/s. D. 5.5 m/s. E. 6.0 m/s.
The electron microscope's main advantage over the optical microscope is which of the following?
a. greater ease of portability b. dispenses with need for a lens c. higher power lens used d. higher resolution possible