American power plants usually supply 120. volts AC:
(a) at what frequency?
(b) at what maximum voltage?
(a) 60. Hz
(b) 170. volts if rms = 120. V
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Today the Sun is in the middle of the constellation Virgo. Therefore, tomorrow the Sun will be in the constellation
A) Libra.
B) Virgo.
C) Leo.
D) Sagittarius.
The Burger’s vector in ionic materials is larger than in elemental metals, because the Burger’s vector must connect two _____________points.
Fill in the blank(s) with the appropriate word(s).
Springs: A very light ideal spring of spring constant (force constant) 2.5 N/cm is 15 cm long when nothing is attached to it. It is now used to pull horizontally on a 12.5-kg box on a perfectly smooth horizontal floor. You observe that the box starts from rest and moves 96 cm during the first 1.6 s of its motion with constant acceleration. How long is the spring during this motion?
Fill in the blank(s) with the appropriate word(s).
A planet is much more massive than the star it orbits
a. True b. False Indicate whether the statement is true or false