Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the magnetic force that each wire exerts on the other?
A) It is doubled.
B) It stays the same.
C) It is tripled.
D) It is quadrupled.
E) It is reduced by a factor of two.
B
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The second is currently defined as
A) 1/86,400 of a mean solar day. B) 1/86,164 of a sidereal day. C) 1/31,557,600 of the period of the Earth's rotation around the Sun. D) the time required for light to travel 1/299,792,458 of a meter. E) the time that it takes the radiation from a Cesium-133 atom to complete 9,192,631,770 cycles of oscillation.
A long cylindrical shell (radius = 2.0 cm) has a charge uniformly distributed on its surface. If the magnitude of the electric field at a point 8.0 cm radially outward from the axis of the shell is 85 N/C, how much charge is distributed on a 2.0-m length of the charged cylindrical surface?
a. 0.38 nC b. 0.76 nC c. 0.19 nC d. 0.57 nC e. 0.98 nC
The idea of rapidly rotating white dwarf stars to explain pulsars was immediately ruled out because such objects would not be ________ enough to spin that rapidly
Fill in the blank(s) with correct word
A batter hits a foul ball. The 0.14-kg baseball that was approaching him at 40 m/s leaves the bat at 30 m/s in a direction perpendicular to the line between the batter and the pitcher. What is the magnitude of the impulse delivered to the baseball?
A) 1.4 N ? s B) 3.5 N ? s C) 5.6 N ? s D) 9.8 N ? s E) 7.0 N ? s