A strong magnetic field easily penetrates
A) human flesh.
B) plastic coatings.
C) both of these
D) none of the above
Answer: C
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Which kind of star is highly unlikely to be found in the halo of the Milky Way?
A) O star B) G star C) K star D) M star
Which is the first postulate of Bohr's model of the atom?
a. The angular momentum of the electron is quantized. b. Light is quantized. c. An electron radiates while it remains in an allowed orbit. d. An electron is not in a precise orbit. e. A photon is emitted whenever an electron jumps up one orbit.
Which of the following must a cell be able to do to produce viable offspring?
A) Make copies of its deoxyribonucleic acid B) Divide rapidly and uncontrollably C) Grow very large in size D) Produce antibiotics
A satellite moves east, taken as the positive x axis direction, at a speed of 0.5 c and a spaceship moves toward it (to the west) at a speed of 0.8 c as measured by an observer on the Earth. The speed of the satellite measured by an observer in the spaceship is
a. 8.7 c b. 0.21 c c. ?0.21 c d. 0.93 c e. ?0.93 c