Three point charges, two positive and one negative, each having a magnitude of 20 ?C are placed at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the electrostatic force on one of the positive charges?
a. 69 N
b. 40 N
c. 80 N
d. 57 N
e. 20 N
b
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Within Earth's atmosphere, in which layer does convection occur?
A) the troposphere B) the stratosphere C) the mesosphere D) the ionosphere E) Convection occurs in all layers of Earth's atmosphere.
In a Young's double slit experiment, if the separation between the two slits is 0.050 mm and the distance from the slits to a screen is 2.5 m,
find the spacing between the first-order and second-order bright fringes for light with wavelength of 600 nm. A) 1.5 cm B) 3.0 cm C) 4.5 cm D) 6.0 cm E) 9.0 cm
Electrostatic discharge that usually occurs during a thunderstorm
A. Waterspout |
B. Tropical Cyclones |
C. Tornado |
D. Lightning |
E. Great Red Spot |
F. Dust Devil |
Sunsets are red because
A) the Sun emits more red light when it's setting. B) sunlight must pass through more atmosphere then, and the atmosphere scatters even more light at bluer wavelengths, transmitting mostly red light. C) sunlight must pass through more atmosphere then, and the atmosphere scatters more light at red wavelengths than bluer wavelengths. D) the cooler atmosphere in the evening absorbs more blue light. E) none of the above