A particle (m = 2.0 ?g, q = ?5.0 ?C) has a speed of 30 m/s at point A and moves (with only electric forces acting on it) to point B where its speed is 80 m/s. Determine the electric potential difference VA ? VB
a. ?2.2 kV
b. +1.1 kV
c. ?1.1 kV
d. +2.2 kV
e. +1.3 kV
c
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Which kinds of mutation tend to have the most dramatic effects on protein structure?
A) all mutations are equally dramatic B) those which change a single base that do not result in a change in the amino acid C) those which change a single base that result in a single amino acid being changed D) those that add or delete a base within a gene
A train traveling at 50. km/h approaches another train moving toward the first at 90. km/h. If they are 35. km apart (on a straight track) how long does it take before they meet?
A) 15. min B) 55. min C) 30. min D) 45. min E) 25. min
You are moving at a speed (2/3)c relative to Randy, and Randy shines a light toward you. At what speed do you see the light passing you by?
A) (1/3)c B) (2/3)c C) (4/3)c D) c E) It depends on whether you are moving towards or away from Randy.
Life jackets help you float because
A) the jacket causes you to weigh less. B) the jacket has the same density as an average human. C) the jacket repels water. D) if you sink, the jacket sinks. E) the combined density of you and the jacket is less than your density alone.