A thin copper rod 1.0 m long has a mass of 0.050 kg and is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to cancel the weight of the rod?
A)
1.2 A
B)
2.5 A
C)
4.9 A
D)
7.6 A
E)
9.8 A
C
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Which statement about the cosmic microwave background is not true?
A) It is the result of a mixture of radiation from many independent sources, such as stars and galaxies. B) Its spectrum has the shape of an essentially perfect thermal radiation spectrum. C) With the exception of very small variations, it appears essentially the same in all directions in which we look into space. D) It is thought to be radiation that began its journey to our telescopes when the universe was about 380,000 years old.
Two different gases may have the same emission line spectrum
a. True b. False Indicate whether the statement is true or false
For a mole of material, the increment of heat (dQ) added to the material divided by the change in temperature (dT) is the heat _____________.
Fill in the blank(s) with the appropriate word(s).
Capacitors in Combination: A system of four capacitors is connected across a 90-V voltage source as shown in the figure. What is the equivalent capacitance of this system?
A. 1.5 ?F B. 15 ?F C. 3.6 ?F D. 3.3 ?F