When more people ride upward in an elevator, more power is required
a. True
b. False
Indicate whether the statement is true or false
True
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A 50-gram superball traveling at 25.0 m/s is bounced off a brick wall and rebounds at 22.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.50 ms, what is the average acceleration of the ball during this time interval?
What will be an ideal response?
Which of the following is not a presumed cause of ice ages?
A) The arrangement of continents around the globe. B) The amount of sunlight being reflected back into space. C) The geometry of Earth's rotation on its axis and revolution around the Sun. D) Volcanic eruptions blocking the sunlight with clouds.
A charge Q is uniformly spread over one surface of a very large nonconducting square elastic sheet having sides of length d. At a point P that is 1.25 cm outside the sheet, the magnitude of the electric field due to the sheet is E
If the sheet is now stretched so that its sides have length 2d, what is the magnitude of the electric field at P? A) 4E B) 2E C) E D) E/2 E) E/4
A 2.0 meter long Aluminum wire (R = 0.44 m?, ? = 2.82 × 10-8 ?-m, ? = 4.29 × 10-3 C-1 ) is connected in series to an 8.0 meter long Tungsten wire (R = 0.20 m?, ? = 5.6 × 10-8 ?-m, ? = 4.5 × 10-3 C-1)
What is the resistance of the combination if the wire is heated to 150.°C? Assume the initial temperature for both wires is room temperature (20°C). A) 0.78 m? B) 0.88 m? C) 0.69 m? D) 1.00 m? E) 0.64 m?