A star with a large parallax
A) is at a great distance from Earth.
B) is moving at a great speed with respect to Earth.
C) is at a short distance from Earth.
D) is moving at a slow speed with respect to Earth.
E) is not moving with respect to Earth.
C
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Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in the same direction,
A) one wire is lifted slightly while the other wire is forced downward against the table's surface. B) both wires are lifted slightly. C) the wires pull toward each other. D) the wires push away from each other.
A 20-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 3.0 m/s in a region where the magnetic field of the earth is 60 mT directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire?
a. 36 mV b. 18 mV c. 31 mV d. 24 mV e. 21 mV
Tensile Stress and Strain: A 25-kg piece of equipment can be hung by steel wires of length 1.00 m, 2.00 m, or 3.00 m. If all the wires have the same diameter, which one will stretch the greatest percent?
A. the 1.00-m wire B. the 2.00-m wire C. the 3.00-m wire D. They will all stretch by the same percent.
A particle (q = 5.0 nC, m = 3.0 mg) moves in a region where the magnetic field has components Bx = 2.0 mT, By = 3.0 mT, and Bz = -4.0 mT. At an instant when the speed of the particle is 5.0 km/s and the direction of its velocity is 120° relative to the magnetic field, what is the magnitude of the acceleration of the particle?
a. 33 m/s2 b. 17 m/s2 c. 39 m/s2 d. 25 m/s2 e. 45 m/s2