Electric Field of Point-Charges: Three equal-magnitude point charges of varying signs are placed at the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the center of the square?
A. A
B. B
C. C
D. D
Answer: A
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Exclusion Principle: The elements in the periodic table that have completely filled shells or subshells are referred to as
A. noble gases. B. halogens. C. alkali metals. D. transition elements.
How would you "weigh" the astronauts in orbit (where they feel weightless) so that you can keep them in good health?
What will be an ideal response?
A swimming pool heater has to be able to raise the temperature of the 50 000 gallons of water in the pool by 12.0 C°. How many kilowatt-hours of energy are required? (One gallon of water has a mass of approximately 3.8 kg and the specific heat of water is 4,186 J/kg/°C.)
a. 6.98E+2 kWh b. 2.65E+3 kWh c. 2.21E+2 kWh d. 2.65E+4 kWh e. 2.65E+2 kWh
A rocket speeding by the Earth is known, when at rest, to be roughly cylindrical with a radius of 15 m and a length of 150 m. When speeding by, its volume is measured to be 
What is its speed?
A. 0.917c B. 0.774c C. 0.678c D. Insufficient information is given.