The voltage drop across a resistor is 4.0 V for a current of 1.0 A in the resistor. What is the current that will produce a voltage drop of 8.0 V across the resistor?
A. 2 A
B. 1 A
C. 0.50 A
D. 0.33 A
Answer: A
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The "back emf" of a motor refers to a source of voltage that
a. occurs when the motor runs backwards. b. occurs when the motor is used as a generator. c. is biggest when the current through the motor is biggest. d. is biggest when the motor turns fastest.
A picture window in a house is 3 feet high by 5 feet long. If the window is 50ºF and the outside air temperature is -10ºF, estimate the heat transfer by natural convection from the window.
What will be an ideal response?
If the temperature of a fixed amount of an ideal gas is increased, it NECESSARILY follows that
A) the pressure of the gas will increase. B) the volume of the gas will increase. C) the speed of the gas molecules will increase. D) All of the above statements are correct.
A force of 120.0 N is applied to 2.000 cm diameter piston in a closed container of water with a density of 1,000 
The force on a piston with a diameter of 25.00 cm is
A. 18,750 N. B. 10,450 N. C. 9,500 N. D. 9,150 N. E. 8,450 N.