A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the magnification if the image is to be viewed by a relaxed eye (image at the far point) having a near point of 25 cm and a far point at infinity?
A) 5.0 x
B) 3.0 x
C) 4.0 x
D) 1.0 x
E) 2.0 x
A
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At temperatures above 0.80 of the melting temperature and at very low stress, the primary mechanism of creep strain in metals is
(a) Cobel creep. (b) Dislocation glide (c) Dislocation creep (d) Herring-Nabarro vacancy flux
Which of the following pairs of forces are an action-reaction pair according to Newton’s 3rd law?
A. The push of the road on the car and the push of the car on the road B. The weight of an object and the normal force on the object C. The air resistance on a sky diver and the weight of the sky diver D. The frictional force acting on an object and the force used to push an object
If you place a pipe over the end of a wrench when trying to rotate a stubborn bolt, effectively making the wrench handle twice as long, you'll multiply the torque by
A) two. B) four. C) eight.
According to Einstein, as the wavelength of the incident monochromatic light beam becomes shorter, the work function of a target material in a phototube:
a. increases. b. is directly proportional to wavelength. c. decreases. d. remains constant.