In the fission reaction 235U + 1n ? 141Ba + 92Kr + neutrons, the number of neutrons produced is
A)
0.
B)
4.
C)
1.
D)
3.
E)
2.
D
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The force exerted on a current-carrying wire located in an external magnetic field is directly proportional to which of the following?
a. current strength b. field strength c. both A and B d. None of the above are valid.
What mass of 14C (having a half-life of 5730 years) do you need to provide a decay rate of 280.0 Bq? (1 u = 1.6605 × 10-27 kg)
A) 1.70 × 10-12 kg B) 5.38 × 10-19 kg C) 3.84 × 10-20 kg D) 8.68 × 10-13 kg
For small angle approximations
A. the angle must be 10° or less B. the angle must be 10 radians or less C. the angle must be 1° or less D. the angle must be 1 radian or less E. the angle must be 45° or less
A particle (q = ?4.0 ?C, m = 5.0 mg) moves in a uniform magnetic field with a velocity having a magnitude of 2.0 km/s and a direction that is 50° away from that of the magnetic field. The particle is observed to have an acceleration with a magnitude of 5.8 m/s2 . What is the magnitude of the magnetic field?
a. 5.3 mT b. 4.9 mT c. 5.1 mT d. 4.7 mT e. 3.6 mT