A good heat conductor is a
A) poor insulator.
B) good insulator.
C) neither of these
Answer: A
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A rectangular plate in plane stress is subjected to normal stresses ?x 5 35 MPa, ?y 5 26 MPa, and shear stress ?xy 5 14 MPa. The ratio of the magnitudes of the principal stresses (?1/?2) is approximately:
(A) 0.8
(B) 1.5
(C) 2.1
(D) 2.9
A ring of negative, uniform charge density is placed on the xz-plane with the center of the ring at the origin. A positive charge moves along the y axis toward the center of the ring
At the moment the charge passes through the center of the ring A) its velocity and its acceleration reach their maximum values. B) its velocity is maximum and its acceleration is zero. C) its velocity and its acceleration have non-zero values but neither is at its maximum. D) its velocity and its acceleration are both equal to zero. E) its velocity is zero and its acceleration is maximum.
Convex spherical mirrors produce images which
A) are always smaller than the actual object. B) are always larger than the actual object. C) are always the same size as the actual object. D) could be larger than or the same size as the actual object, depending on the placement of the object. E) could be smaller than or the same size as the actual object, depending on the placement of the object.
Uniform Circular Motion: If a satellite moves with constant speed in a perfectly circular orbit around the earth, what is the direction of the acceleration of the satellite?
A. in the forward direction B. in the backward direction C. outward away from the earth D. inward toward the earth E. The acceleration is zero because the speed is constant.