A particle (q = -4.0 mC, 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
D
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Most telephone cables are made of copper wire of either 24 or 26 gauge. If the resistance of 24-gauge wire is 137 ?/mile and the resistance of 26-gauge wire is 220 ?/mile, what is the ratio of the diameter of 24-gauge wire to that of 26-gauge wire?
a. 1.6 b. 1.3 c. 0.62 d. 0.79 e. 0.88
What is the sum of 1.49 + 3.212 + 1.9?
A) 7 B) 6.6 C) 6.60 D) 6.602 E) 6.6020
If the kinetic energy of an object increases, then
A. the speed must increase as well. B. the total energy must increase. C. there can only be one force on the object. D. the potential energy must decrease.
The redshifts of Galaxy A and Galaxy B have been measured. The redshift of Galaxy B is twice that of Galaxy A. Which is moving away faster?
A. Galaxy A B. The two galaxies may be moving away at the same speed since their recessional velocity depends upon their distance. C. Galaxy B