A fixed focus camera has a focal length of 35.0 mm. How far must the lens be moved in order to change focus from an object that is 20.0 m away to one that is 3.0 m away?
A. 0.34 mm
B. 0.41 mm
C. 0.35 mm
D. 0.47 mm
C. 0.35 mm
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A new generation of ground-based telescopes is currently being built that overcomes the limitations of the older large telescopes. Some of these new telescopes
a. use segmented mirrors. b. use mirrors that are very thin. c. use active optics to control the shape of the mirror. d. All of the other choices are correct. e. None of the other choices are correct.
If we compress the entire history of the into one year, each month represents
A) about a billion years B) a few tens of millions of years C) a few hundred years D) a few million years
A solid steel column is 4.0 m long and 0.20 m in diameter. Young's modulus for this steel is 2.0 × 1011 N/m2. By what distance does the column shrink when a 5000-kg truck is supported by it?
A) 3.2 × 10-6 m B) 8.0 × 10-7 m C) 3.1 × 10-5 m D) 7.8 × 10-6 m
A baseball outfielder throws a baseball of mass 0.36 kg at a speed of 34.0 m/s and initial angle of 30°. What is the kinetic energy of the baseball at the highest point of the trajectory? Ignore air friction
a. zero b. 312 J c. 156 J d. 52.0 J e. 208 J