A very long thin wire produces a magnetic field of 0.0050 × 10-4 T at a distance of 3.0 mm. from the central axis of the wire. What is the magnitude of the current in the wire? (?0 = 4? × 10-7 T ? m/
A)
A) 7.5 mA
B) 1.7 mA
C) 3300 mA
D) 24,000 mA
A
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Which of the following statements is true regarding shock waves?
A) They are predominantly transverse in nature. B) They can be produced by the birth of very hot stars. C) They are also called shear waves. D) They cannot be produced by supernova explosions.
The two moons of Mars are captured _______________
Fill in the blank(s) with correct word
A stone is held at a height h above the ground. A second stone with four times the mass of the first one is held at the same height
The gravitational potential energy of the second stone-Earth system compared to that of the first stone-Earth system is A) one-fourth as much. B) one-half as much. C) twice as much. D) four times as much. E) the same.
Alex throws a 0.25-kg rubber ball down onto the floor. The ball's speed just before impact is 4.5 m/s, and just after is 2.9 m/s. What is the change in the magnitude of the ball's momentum?
a. 0.39 kg/m/s b. 1.9 kg/m/s c. 1.1 kg/m/s d. 0.73 kg/m/s e. 7.4 kg/m/s