A bar magnet is held above the center of a conducting ring in the horizontal plane. The magnet is dropped so it falls lengthwise toward the center of the ring. Will the falling magnet be attracted toward the ring or be repelled by the ring due to the magnetic interaction of the magnet and the ring?
a. It will be attracted.
b. It will be repelled.
c. It will be attracted only if the north end of the magnet is the leading end as it falls toward the ring.
d. It will be attracted only if the south end of the magnet is the leading end as it falls toward the ring.
b
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A wheel rotates about a fixed axis with a constant angular acceleration of 4.0 rad/s2 . The diameter of the wheel is 40 cm. What is the linear speed of a point on the rim of this wheel at an instant when that point has a total linear acceleration with a magnitude of 1.2 m/s2?
a. 39 cm/s b. 42 cm/s c. 45 cm/s d. 35 cm/s e. 53 cm/s
A slit of variable width illuminated by light of wavelength ? is widened until the first order diffraction minimum moves out to a distance infinitely far away from the brightest location in the central maximum. In terms of the wavelength, the width of the slit is then
A.
B.
.C.
D.
.E.
The force acting on an object is given by Fx = (5x – 10) N, where x is in meters. What is the net work done by the force as the object moves from x = 0 to x = 4.50?
a. 5.6 J b. 15.6 J c. 12.5 J d. 11.3 J