Observers in different inertial frames can disagree about the time separating two events
Indicate whether the statement is true or false
TRUE
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Baryons are composed of
A. any odd number of quarks. B. three quarks of matching color. C. three quarks of three different colors. D. a colorless quark-antiquark pair.
Talk-radio station KOOK is at approximately 90 megahertz on the radio dial. This means that KOOK broadcasts
A) an electromagnetic wave whose frequency is 90 vibrations/second. B) an electromagnetic wave whose frequency is 90 × 106 vibrations/second. C) an electromagnetic wave whose wavelength is 90 × 106 vibrations per second. D) a sound wave whose frequency is 90 × 106 vibrations/second. E) a sound wave whose frequency is 90 vibrations/second.
Consider two different isotopes of the same neutral element. Which statements about these isotopes are true? (There may be more than one correct choice.)
A) Both isotopes contain the same number of orbital electrons. B) The sum of the protons and neutrons is the same for both isotopes. C) Both isotopes contain the same number of protons. D) Both isotopes contain the same number of neutrons. E) Both isotopes contain the same number of nucleons.
A 66-kg woman runs up a flight of stairs having a rise of 4.0 m in a time of 4.2 s. What average power did she supply?
a. 380 W c. 620 W b. 560 W d. 670 W