Neutron activation is used
A. to treat cancer
B. to search for rare atoms
C. to provide energy
D. to create light
Answer: B. to search for rare atoms
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When the nuclear reactions begin making too little energy in a star, by virtue of the natural thermostat, the star:
A) would expand slightly. B) would reduce its central temperature. C) would increase its density. D) would increase the mass by a factor of 2.
Rotational Kinetic Energy: A string is wrapped tightly around a fixed pulley that has a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm. A mass of 423 g is attached to the free end of the string. With the string vertical and taut, the mass is gently released so it can descend under the influence of gravity. As the mass descends, the string unwinds and causes the pulley to rotate, but does not slip on the pulley. What is the speed of the mass after it has fallen through 1.25 m?
A. 2.00 m/s B. 2.28 m/s C. 1.97 m/s D. 3.94 m/s E. 4.95 m/s
The exchange particle that mediates the strong interaction is the
A. gluon. B. photon. C. graviton. D. neutrino.
Two long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in opposite directions. What is the magnitude of the resulting magnetic field at a point that is 15 cm from the wire carrying the 30-A current and 25 cm from the other wire?
a. 51 mT b. 33 mT c. 72 mT d. 64 mT e. 46 mT