Magnetic fields are produced by
A) a tiny fraction of moving electrical charges.
B) most moving electrical charges.
C) all moving electrical charges.
Answer: C
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Standing Sound Waves: The lowest tone to resonate in pipe of length L that is open at both ends is 200 Hz. Which one of the following frequencies will not resonate in the same pipe?
A. 200 Hz B. 400 Hz C. 600 Hz D. 800 Hz E. 900 Hz
A charge Q is placed on the x axis at x = +4.0 m. A second charge q is located at the origin. If Q = +75 nC and q = -8.0 nC, what is the magnitude of the electric field on the y axis at y = +3.0 m?
a. 19 N/C b. 23 N/C c. 32 N/C d. 35 N/C e. 21 N/C
Briefly explain how a fiber made of oriented ultra-high-molecular-weight polyethylene can be much stronger than structural steel in tension, but perpendicular to the fiber axis, its hardness is much less than that of steel.
What will be an ideal response?
Three strings on a guitar are first stretched to the same tension. The first of the strings is heavy (thick), the third is light (thin), and the second is in between. Rank them according to the speed at which waves would propagate along them if they were plucked, with the fastest last
1.(3) (2) (1) 2.(3) (1) (2) 3.(1) (2) (3) 4.The waves would propagate at the same speed through each.