The theory of special relativity
A) is based on a complex mathematical analysis.
B) does not agree with electromagnetic theory.
C) does not agree with Newtonian mechanics.
D) has not been verified by experiment.
C
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If the average density of the universe is less than the critical density, the universe is open
Indicate whether the statement is true or false
5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary?
A) 1.1 A B) 4.6 A C) 5.0 A D) 17 A E) 23 A
A beam of electrons is sent in the positive x direction in a region with a uniform magnetic field B in the positive y direction and a uniform electric field E in the positive z direction. At which of the following speeds would the electrons be deflected in the positive z direction?
a. v = E/B b. There is no speed for which this will happen. c. v < E/B d. v > E/B
Why do we use fuses?
a. to eliminate shock hazards b. to prevent fires c. to save on the cost of electricity d. to store charge