A certain slide projector has a lens of focal length 15.0 cm. This lens forms an image measuring 100 cm × 100 cm on the screen when a slide whose dimensions are 50.0 mm × 50.0 mm is being magnified
How far from the lens should the screen be placed?
3.15 m
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Which of the following metals is least likely to be suitable for wire drawing?
(a) Magnesium (b) Aluminum (c) Copper (d) Iron
The time interval during which a nucleus has a 50% probability of decaying is its half-life
a. True b. False Indicate whether the statement is true or false
The figure shows a cross section of three parallel wires each carrying a current of 24 A. The currents in wires B and C are out of the paper, while that in wire A is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 4.0-m length of wire A?
A. 15 mN B. 77 mN C. 59 mN D. 12 mN E. 32 mN
Red giant stars are I. more luminous than the Sun. II. larger in diameter than the Sun. III. cooler than B stars. IV. located above the main-sequence stars in the H-R diagram
a. I & II b. II & IV c. I, II, & IV d. II, III, & IV e. I, II, III, & IV