A star has crossed the birth line and thus that star is now called a ________________
a. main-sequence star b. protostar
c. YSO d. ZAMS
c
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The least buoyant force on a rock is when it is submerged
A) near the surface. B) halfway to the bottom. C) near the bottom. D) none of the above
In simple harmonic motion, the speed is greatest at that point in the cycle when
A) the magnitude of the acceleration is a maximum. B) the displacement is a maximum. C) the magnitude of the acceleration is a minimum. D) the potential energy is a maximum. E) the kinetic energy is a minimum.
The following statements all refer to the human brain when mental activity is occurring. Which statement is correct?
a. In order to detect electric currents in the brain, you must open the skull and make direct electrical contact with the brain. b. The electric currents in the brain can be detected outside the brain by detecting the magnetic fields they produce. c. The electric currents in the brain can be mapped by shaving a person's head and dropping iron filings on the head. d. The electric currents in the brain produce an aura that can be detected visually. e. The electric currents in the brain cannot be detected by any means.
The beam of electrons that hits the screen of an oscilloscope is moved up and down by:
a. varying the electron's charge. b. electrical charges on deflecting plates above and below the beam. c. gravity. d. a phosphorescent coating.