Simple Pendulum: A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest the period of the pendulum is T. How does the period of the pendulum change when the elevator moves upward with constant acceleration?
A. The period does not change.
B. The period increases.
C. The period decreases.
D. The period becomes zero.
E. The period increases if the upward acceleration is more than g/2 but decreases if the upward acceleration is less than g/2.
Answer: C
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Length Contraction: An astronaut is resting on a bed inclined at an angle above the floor of a spaceship, as shown in the figure. From the point of view of an observer who sees the spaceship moving near the speed of light parallel to the floor, the angle the bed makes with the floor
A. is greater than the angle observed by the astronaut. B. is the same as the angle observed by the astronaut. C. is smaller than the angle observed by the astronaut. D. could be greater or smaller than the angle observed by the astronaut depending on whether the rocket is moving to the right or to the left.
Circular Motion of Charges: A charged particle of mass 0.0040 kg is subjected to a 4.0-T magnetic field which acts at a right angle to its motion. If the particle moves in a circle of radius 0.10 m at a speed of 2.0 m/s, what is the magnitude of the charge on the particle?
A. 0.020 C B. 50 C C. 0.00040 C D. 2500 C
Metamorphic definition
What will be an ideal response?
What must be true in order for an atom to absorb a photon?
A) The photon must have energy matching the difference in energy between two energy levels in the atom. B) The atom must have lost all of its electrons. C) The photon must have enough energy to remove an electron from the atom. D) A or C E) B or C