A 40-mC charge is positioned on the x axis at x = 4.0 cm. Where should a -60-mC charge be placed to produce a net electric field of zero at the origin?
a. -5.3 cm
b. 5.7 cm
c. 4.9 cm
d. -6.0 cm
e. +6.0 cm
C
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An ideal transformer has 50 turns in the primary and 500 turns in the secondary. An input of 12 V will produce an output of
A) 12 V. B) 120 V. C) 1200 V. D) none of the above
On a day when the speed of sound in air is 340 m/s, what will be the wavelength of sound of frequency 227 Hz?
A. 0.67 m B. 1.5 m C. 0.33 m D. 3.0 m E. 227 m
How does the mass of the products of a nuclear fusion reaction compare to the mass of the original elements?
A) The mass of the products is less than the mass of the original elements. B) The mass of the products is greater than the mass of the original elements. C) The mass of the products is unrelated to the mass of the original elements. D) The mass of the products is equal to the mass of the original elements.
Almost all of Earth's supply of energy comes from
A) the oceans. B) Earth's interior. C) the Sun. D) carbon dioxide.