Which of the following is possessed by a moving object, but not by a stationary object?
A. Mass
B. Kinetic energy
C. Energy
D. Inertia
Answer: B
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A single circular (radius = R) loop of wire is located in the yz plane with its center at the origin. The loop has a clockwise current as seen from the point (+R, 0, 0). The direction of the magnetic field at the point
A.
and at the point (+R, 0, 0) is ?
.B.
and at the point (0, +2R, 0) is ?.C.
and at the point (+R, 0, 0) is +.D.
and at the point (0, +2R, 0) is +.E.
If a galaxy is receding at 0.10 c, how far away is the galaxy if the Hubble parameter is 70 km/s/Mpc?
A) 1.4 × 109 ly B) 23 Mpc C) 76 Mly D) 7 Mpc E) 1.4 × 107 ly
An industrial fabrication process stamps out thin metal pieces, each in the shape of a square with a circular hole in the middle, from a large thin sheet. These pieces are mounted in a large machine
As these pieces heat up during regular machine operation, the diameter of the circular hole will A) decrease. B) stay the same. C) increase. D) behave unpredictably causing the machine to malfunction.
You wish to construct a simple ac generator with a maximum output of 12 V when rotated at 60 Hz. A magnetic field of 0.050 T is available. #If the area of the rotating coil is 100 cm2, how many turns are needed?
What will be an ideal response?