Is it feasible to use the physical properties of a simple pendulum to designate the standard values for any of the fundamental quantities? Justify your answer
Yes, length and time could be designated with a pendulum but mass could not. The
simple pendulum equation does not include mass.
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Which of the following statements best describes how the uncertainty principle affects conservation of energy?
A) The uncertainty principle allows very short time-scale violation of energy conservation, but energy must still be conserved on time scales that allow measurement. B) The uncertainty principle invalidated the law of conservation of energy, and as a result, this law is no longer useful to physicists. C) The uncertainty principle does not apply to energy, so conservation of energy is not affected by it. D) The uncertainty principle tells us that the law of conservation of energy applies only to very large objects, not to atoms or molecules.
A rectangular loop of wire of width 10 cm and length 20 cm has a current of 2.5 A flowing through it
Two sides of the loop are oriented parallel to a uniform magnetic field of strength 0.037 T, the other two sides being perpendicular to the magnetic field. The magnitude of the torque on the loop is A) 0.0093 m?N. B) 0.025 m?N. C) 0.050 m?N. D) 0.0019 m?N. E) 0.038 m?N.
When a light ray traveling in air meets the surface of a piece of glass, which of the following occur at the interface?
a. The light is totally reflected. b. Some of the light is reflected back into the air. c. Some light enters the glass and is refracted toward the normal. d. Some light enters the glass and is refracted away from the normal. e. All of the light enters the glass.
A 20 N ball and a 40 N ball are dropped at the same time from a height of 10 meters. Air resistance is negligible. Which of the following statements is accurate?
A. After 1 second has elapsed, both balls have the same kinetic energy, since they have the same acceleration B. Both balls hit the ground at the same time but gravity does more work on the heavy ball than on the light ball C. The heavy ball has a greater acceleration and falls faster D. The light ball has a greater speed, since it can accelerate faster than the heavy ball