In which material does light travel fastest?
A) glass
B) water
C) plastic
D) air
E) same for all
Answer: D
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Three particles are placed in the xy plane. A 30-g particle is located at (3, 4) m, and a 40-g particle is located at (?2, ?2) m. Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?
a. (?3, ?1) m b. (+1, +3) m c. (+3, ?1) m d. (?1, ?3) m e. (?0.5, ?2) m
Put one of your thumbs at arm's length in front of your face. Now focus on something in the background and look through one eye at a time. What do you notice about your thumb?
A. It appears to move more when it's closer. B. It appears to move less when it's closer. C. It appears to move the same when it's closer. D. It disappears entirely when it's closer! E. None of the above.
What is the power of the lens that has a focal length of 40 cm and a diameter if 5.0 cm?
A) +0.20 diopters B) +2.5 diopters C) +2.7 diopters D) +20 diopters E) -2.5 diopters
A projectile is fired from ground level with an initial speed of 55.6 m/s at an angle of 41.2° above the horizontal. (a) Determine the time necessary for the projectile to reach its maximum height
(b) Determine the maximum height reached by the projectile. (c) Determine the horizontal and vertical components of the velocity vector at the maximum height. (d) Determine the horizontal and vertical components of the acceleration vector at the maximum height.