The magnetic field lines of a bar magnet
A. emerge from the north pole and go back into the north pole
B. emerge from the north pole and go into the south pole
C. emerge from the south pole and go back into the south pole
D. emerge from the south pole and go into the north pole
B. The magnetic field lines of a bar magnet emerge from the north pole and go into the south pole
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Homer says that we can safely use nuclear power because all radioactive nuclei are gone after two half-lives. Marge says that only the decay rate is zero after two half-lives. Which one, if either, is correct, and why?
a. Homer, because half of the nuclei disintegrate in each half-life. b. Marge, because the number of decays per unit time is halved in each half-life. c. Homer, because it's safe to handle radioactive substances after two half-lives. d. Both, because when all nuclei disintegrate the decay rate is also zero. e. Neither, because one quarter of the nuclei are left after two half-lives.
The _____ is a band centered on the ecliptic and encircling the sky
A) nadir B) zodiac C) horizon D) zenith
A student lifts a weight of 10.0 N a distance of 0.500 meters. The energy needed to do this work in calories is (1 cal = 4.186 Joules)
A. 0.570 cal. B. 0.750 cal. C. 1.19 cal. D. 1.75 cal. E. 2.30 cal.
A 0.500-kg ball traveling horizontally on a frictionless surface approaches a very massive stone at 20.0 m/s perpendicular to wall and rebounds with 70.0% of its initial kinetic energy
What is the magnitude of the change in momentum of the stone? A) 18.4 kg ? m/s B) 14.0 kg ? m/s C) 3.00 kg ? m/s D) 1.63 kg ? m/s E) 0.000 kg ? m/s