A proton, moving west, enters a magnetic field. Because of this magnetic field the proton curves upward. We may conclude that the magnetic field must have a component
A) towards the west.
B) towards the east.
C) towards the south.
D) towards the north.
E) downward.
C
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Steam that issues from a pressure cooker
A) is invisible. B) cools as it expands. C) both of these D) neither of these
Two charged bodies separated by a distance d exert an electrical force on each other. The distance d is doubled. The electrical force on each body now
a. decreases by 1/4. b. decreases by 1/2. c. stays the same. d. increases by 2 times. e. increases by 4 times.
Radioactive Decay: Time (days)026111930Counts per Minute1000899726556356200In a laboratory accident, a work area is contaminated with radioactive material. Health physicists monitor the area during a 30-day period and obtain the data shown in the table. The accident occurred at time t = 0 days. They determine that it will not be safe for workers to enter the area until the radioactivity level has dropped to 16 counts per minute. Of the choices listed, which one is the earliest time after the accident that workers could safely return?
A. 77 days B. 90 days C. 102 days D. 65 days E. 48 days
Which of the following best describes superconductors?
1.conductors that have less than half the resistivity of iron 2.conductors with essentially no resistance below a critical temperature, peculiar to each material 3.conductors which have a drop in their resistivity as their temperatures are lowered 4.Conductors are materials which are very useful in a variety of ways; hence the name "superconductor."