Electrons flow through a circuit in the clockwise direction. The current is traveling
1.clockwise.
2.counterclockwise.
3.not at all.
4.in a direction impossible to tell without knowing what the positive charges are doing.
2
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Suppose that Hubble's constant were 20 kilometers per second per million light-years. How fast would we expect a galaxy 100 million light-years away to be moving? (Assume the motion is due only to Hubble's law.)
A) away from us at 20,000 km/s B) away from us at 200 km/s C) away from us at 2,000 km/s D) toward us at 2,000 km/s
A 200-g hockey puck is launched up a ramp that is inclined at a 30° angle above the horizontal
The coefficients of static and kinetic friction between the puck and the ramp are µs = 0.40 and µk = 0.30, respectively, and the puck's initial velocity at the base is 3.8 m/s parallel to the sloping surface of the ramp. What speed does the puck have when it slides back down to its starting point?
A general rule for estimating the distance in kilometers between an observer and a lightning bolt is to count the number of seconds between seeing the lightning and hearing it, and dividing by
A) 2. B) 3. C) 4. D) 5. E) none of the above
The objective lens of a telescope has a focal length of 1.90 m. When viewed through this telescope, the Moon appears 5.25 times larger than normal
How far apart are the objective lens and the eyepiece when this instrument is focused on the Moon?