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

Physics & Space Science

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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.

Physics & Space Science

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.

Physics & Space Science

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?

Physics & Space Science

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

Physics & Space Science