The power rating of a resistor is 0.800 W. The value of the resistor is 400 ?. (a) What is the maximum voltage? (b) What is the maximum current it can draw?
What will be an ideal response?
(a) 17.9 V
(b) 45 mA
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After landing on an unexplored Klingon planet, Spock tests for the direction of the magnetic field by firing a beam of electrons in various directions and by recording the following observations: Electrons moving upward feel a magnetic force in
the northwest direction. Electrons moving horizontally toward the north are pushed downward. Electrons moving horizontally toward the southeast are pushed upward. Mr. Spock therefore concludes that the magnetic field at this landing site is in which direction? A) toward the east B) toward the northeast C) toward the southwest D) toward the southeast E) toward the west
A.A B.B C.C D.D E. Toward the viewer F. Away from the viewer T. The field is zero.
The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 × 10^-6/°C. On a cold day when the temperature is –10°C the Eiffel tower is 300 meters tall. Its height on a hot day when the temperature is 40°C is
a. 300.0015 m b. 300.015 m c. 300.15 m d. 301.5 m e. 315 m
When a wool blanket is used to keep warm, what is the primary insulating material?
a. wool b. air c. the trim around the edge of the blanket d. a thin layer of aluminum foil (usually not apparent) inside the blanket