A cyclotron operates at 10 MHz. What magnetic field is needed to accelerate protons?
A)
0.12 T
B)
0.25 T
C)
0.66 T
D)
1.3 T
E)
1.5 T
C
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When a standing wave occurs on a string,
1.all points along the string move up and down equal distances. 2.all points along the string move up and down, but some move more than others. 3.many points along the string move up and down, some move more than others, and some are stationary. 4.all points along the string are completely stationary because the waves from each direction cancel each other out.
A third quarter moon is visible
a. near the eastern horizon just before sunrise. b. near the eastern horizon just after sunset. c. in the southern sky at sunrise. d. in the southern sky at sunset. e. from sunset until sunrise.
Two tiny particles having charges of +5.00 ?C and +7.00 ?C are placed along the x-axis. The +5.00-µC particle is at x = 0.00 cm, and the other particle is at x = 100.00 cm
Where on the x-axis must a third charged particle be placed so that the net electrostatic force exerted on it by the other two particles is zero? A) 4.58 cm B) 45.8 cm C) 50 cm D) 9.12 cm E) 91.2 cm
Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in opposite directions,
A) the wires pull toward each other. B) one wire is lifted slightly while the other wire is forced downward against the table's surface. C) both wires are lifted slightly. D) the wires push away from each other.