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 ?T directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire?
a. 36 ?V
b. 18 ?V
c. 31 ?V
d. 24 ?V
e. 21 ?V
b
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Rotational Kinetic Energy: A solid uniform sphere is rolling without slipping along a horizontal surface with a speed of 5.5 m/s when it starts up a ramp that makes an angle of 25° with the horizontal. What is the speed of the sphere after it has rolled 3.0 m up as measured along the surface of the ramp?
A. 4.0 m/s B. 8.0 m/s C. 1.9 m/s D. 2.2 m/s E. 3.5 m/s
Three 2.50-?C charges are placed on tiny conducting spheres at the ends of 1.00 m-long strings that are connected at 120° angles as shown below. The magnitude, in N, of the tension in any one of the strings is
?
?
A. 1.88 × 10?2. B. 3.25 × 10?2. C. 3.75 × 10?2. D. 6.50 × 10?2. E. 7.50 × 10?2.
The N14 nucleus consists of
A. 21 protons and 7 electrons. B. 7 protons and 7 neutrons. C. 14 protons. D. 14 neutrons.
Who established the principle of faunal succession?
A) Alfred Wegener. B) Harry Hess. C) William "Strata" Smith. D) Andrija Mohorovicic.