When radioactive decays are counted, the resulting counts vary because of their statistical nature although the experimental situation may be the same. If 106 counts are registered, the next measurement of an equivalent situation may be expected to typically vary by about how many counts?
A. 1
B. 100
C. 1000
D. 10,000
E. 100,000
C. 1000
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A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is positive. The sphere is
a. rotating clockwise and slowing down. b. rotating counterclockwise and slowing down. c. rotating clockwise and speeding up. d. rotating counterclockwise and speeding up. e. first rotating counterclockwise and then clockwise.
A parallel plate capacitor with an air dielectric is attached to a voltage source and charged. The voltage source is removed, and then the plates are separated to double their previous distance. What happens to the potential difference between the plates when they are separated?
A. it doubles B. it quadruples C. it halves D. it is diminished by a factor of 4 E. it stays the same
While standing at a crosswalk, you hear a frequency of 540 Hz from an approaching police car. After the police car passes, its frequency is 480 Hz. What is the speed of the police car? (speed of sound = 340 m/s)
a. 13.1 m/s c. 20.0 m/s b. 17.4 m/s d. 26.2 m/s
Large icebergs in the Arctic and Antarctic form as
A) frozen seawater thickens. B) sea ice forms next to continental land. C) glaciers calve into the sea. D) alpine glaciers melt in Arctic and Antarctic waters.