The electromagnetic force is stronger than gravity. Why is it over-powered by gravity on large scales?
A) Most objects are electrically neutral.
B) The electromagnetic force only works on scales of about an atomic nucleus.
C) The electromagnetic force follows an inverse cube law with distance, rather than an inverse square law.
D) Electrical charge is canceled out by mass.
A
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The chemical composition differences between the planets are basically the result of the fact that different elements condense out of gas at different ________
Fill in the blank(s) with correct word
A galvanometer calibrated to read current is
A) an ammeter. B) a voltmeter. C) an ohm meter. D) none of the above
Three disks have the same mass and the same total kinetic energy. Disk #1 has radius R, disk #2 has radius 2R, and disk #3 has radius 3R. Which one has the highest vtranslational?
a. disk #1 b. disk #2 c. disk #3 d. The all have the same vtranslational.
The energy transformed in an inductor during a portion of a cycle
A) is always positive. B) may be positive, negative, or zero. C) is always negative. D) is always zero. E) is never zero.