In the figure below, does the resistance of the diode increase or decrease as the positive voltage ?V increases?
2
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Approximately how large in diameter would the star Betelgeuse be on this same scale?
A) 40 centimeters (the size of a typical beach ball) B) 6 meters (roughly the size of a dorm room) C) 130 meters (slightly larger than a football field) D) 3 kilometers (the size of a small town)
When a spinning ice skater pulls in his arms, he spins faster because ________
A) there exists an unbalanced reaction force B) there is less friction with the ice C) there is less friction with the air D) his angular momentum must be conserved, so reducing his radius must increase his speed of rotation
Magnetic Field of a Long Wire: Two long parallel wires that are 0.40 m apart carry currents of 10 A in opposite directions. What is the magnetic field strength in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (?0 = 4? × 10-7 T ? m/A)
A. 3.3 µT B. 6.7 µT C. 33 µT D. 67 µT
Space and time are
A) bound together. B) independent entities.