Three resistors, each of different value, are used in a circuit with a power source supplying 12 volts. For which of the following resistor combinations is the total power supplied the greatest?
a. This cannot be found until it is known which resistor is in series with the parallel pair.
b. all three resistors in series
c. two of the resistors in parallel with the third resistor in series with the parallel pair
d. all three resistors in parallel
D
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When a hard rubber rod is given a negative charge by rubbing it with wool:
A) positive charges are transferred from rod to wool B) negative charges are transferred from rod to wool C) positive charges are transferred from wool to rod D) negative charges are transferred from wool to rod E) negative charges are created and stored on the rod
All the following statements are true. Which one explains why convection can occur in the troposphere but not in the stratosphere?
A) Atmospheric pressure is much greater in the troposphere than in the stratosphere. B) The stratosphere contains significant amounts of ozone but the troposphere does not. C) Temperature declines with altitude in the troposphere but increases with altitude in the stratosphere. D) Clouds tend to form in the troposphere but not the stratosphere.
A double-paned window consists of two 60.0 cm × 100 cm glass panes, 2.00 mm thick, separated by a 1.50 cm layer of still air. 25.0 W of heat flow through the window
What is the temperature difference between the indoors and outdoors? The thermal conductivity of glass is 0.840 W/(m•K), and that of air is 0.0234 W/(m•K). A) 27.6 K B) 27.3 K C) 26.9 K D) 26.7 K E) 26.3 K
An object, located 80.0 cm from a concave lens, forms an image 39.6 cm from the lens on the same side as the object. What is the focal length of the lens?
a. –26.5 cm b. –120 cm c. –78.4 cm d. –80.8 cm e. –20.0 cm