Just after a big fish swallows a small fish, the momentum of the two-fish system is
A) greater after lunch than before.
B) the same before and after lunch.
C) somewhat less after lunch.
Answer: B
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The magnetic field due to the current in a long, straight wire is 8.0 ?T at a distance of 4.0 cm from the center of the wire. What is the current in the wire?
A) 0.20 A B) 0.40 A C) 0.80 A D) 3.2 A E) 1.6 A
Which of the following statements is true in the context of radioactive elements?
A) The abundances of the daughter isotopes of radioactive elements in a rock gradually decrease. B) The abundance of a radioactive element in a rock gradually decreases. C) Uranium-238 has the longest half-life among all the other radioactive substances. D) Potassium-40 has the longest half-life among all the other radioactive substances.
An induced emf is produced in
a. a closed loop of wire when it remains at rest in a nonuniform static magnetic field. b. a closed loop of wire when it remains at rest in a uniform static magnetic field. c. a closed loop of wire moving at constant velocity in a nonuniform static magnetic field. d. all of the above. e. only (b) and (c) above.
What energy is needed (in MeV) so two deuterium atoms moving together will reach the necessary 10?14 m for fusion?
a. 0.511 b. 0.14 c. 2.5 d. 4.3 e. 1.0