Radon has a 4-day half-life. Starting with 10 radon atoms, how many will remain after 4 days?
A) Precisely five.
B) Either four, or five, or six.
C) Precisely zero.
D) About 5, but this prediction is uncertain due to the inaccuracies of our measuring devices.
E) About 5, but this prediction is uncertain due to quantum uncertainties.
E
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Which of the following is true of the Moon orbiting Earth?
A) The Moon orbits westward around Earth once a month. B) The Moon orbits westward around Earth once a year. C) The Moon orbits eastward around Earth once a month. D) The Moon orbits eastward around Earth once a year.
An explorer walks into a lab in a science building. She has a compass in her hand and finds that the south pole of her compass points toward the room's East wall when she is nearer that wall and toward the west wall when she is nearer that wall. You could explain this if magnetized metal had been installed in the East and West walls with North poles pointing into the room. If no magnetic material
was installed in the North or South walls of the room, she would expect that a. the south pole of the compass would tend to point toward those walls. b. the north pole of the compass would tend to point toward those walls. c. the compass needle would not point in any particular direction. d. the north pole of the compass needle would tend to point toward the centers of those walls, but the south pole would tend to point toward the sides of those walls. e. the south pole of the compass needle would tend to point toward the centers of those walls, but the north pole would tend to point toward the sides of those walls.
Two bodies with masses m1 and m2 are both moving east with velocities of magnitudes v1 and v2, where v1 is less than v2 . The magnitude of the velocity of the center of mass of this system of two bodies is
a. less than v1. b. equal to v1. c. equal to the average of v1 and v2. d. greater than v1 and less than v2. e. greater than v2.
The resistance of the heater is __________
Fill in the blank(s) with correct word