A 0.20-km wide river has a uniform flow speed of 3.0 m/s toward the east. A boat with a speed of 8.0 m/s relative to the water leaves the south bank and heads in such a way that it crosses to a point directly north of its departure point. How long does it take the boat to cross the river?
a. 29 s
b. 23 s
c. 25 s
d. 27 s
e. 17 s
d
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If the voltage across the ends of a wire increases, the current in the wire __________
Fill in the blank(s) with correct word
A horizontal wire of length 3.0 m carries a current of 6.0 A and is oriented so that the current direction is 50° S of W. The Earth's magnetic field is due north at this point and has a strength of 0.14 × 10^?4 T. What is the direction of the force on the wire?
a. out of the Earth's surface b. toward the Earth's surface c. due east d. 40° S of E
Lenz's Law: A coil lies flat on a horizontal tabletop in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?
A. counterclockwise B. clockwise C. clockwise initially, then counterclockwise before stopping D. There is no induced current in this coil.
Two protons are released from rest, with only the electrostatic force exerted on them. Which of the following statements must be true about them as they move apart? (There could be more than one correct choice.)
A) Their electric potential energy keeps increasing. B) Their kinetic energy keeps increasing. C) Their electric potential energy keeps decreasing. D) Their kinetic energy keeps decreasing. E) Their acceleration keeps decreasing.