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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The highest-strength aluminum alloys, such as 7075-T6, are strengthened by _________-hardening.
Fill in the blank(s) with the appropriate word(s).
The center spot of Newton's rings is dark. This destructive interference occurs because:
a. the two beams travel distances that are different by half a wavelength. b. both waves change phase by 180° as they are reflected. c. one beam changes phase by 180° when it is reflected. d. both waves have a trough.
Thermodynamic Processes: When a gas expands adiabatically,
A. the internal (thermal) energy of the gas decreases. B. the internal (thermal) energy of the gas increases. C. it does no work. D. work is done on the gas. E. the temperature of the gas remains constant.
Give a general statement of the Second Law of Thermodynamics
What will be an ideal response?