If the distance between two negative point charges is increased by a factor of two, the resultant potential energy is what factor times the initial potential energy?
a. 2
c. 1/4
b. 1/2
d. 4
B
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Estimate the thickness of a piece of paper
A) 10-4 meter B) 10-5 meter C) 10-6 meter D) 10-7 meter E) 10-8 meter
A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600 N, what is the fundamental frequency?
a. 316 Hz b. 632 Hz c. 158 Hz d. 215 Hz e. 79 Hz
A waning crescent moon can appear on an observer's meridian between ______________ and ______________. (Answers in times of day.)
Fill in the blank(s) with correct word
A long solenoid (diameter = 5.0 cm) is wound with 960 turns per meter of thin wire through which a current of 300 mA is maintained. A wire carrying 12 A is inserted along the axis of the solenoid. What is the magnitude of the magnetic field at a point 2.0 cm from the axis?
a. 0.41 mT b. 0.48 mT c. 0.38 mT d. 0.56 mT e. 0.24 mT