Plane Mirrors: David stands 2.5 m in front of a plane mirror.(a) How far from David is his image in the mirror?(b) If David moves away from the mirror at 1.5 m/s, how fast are David and his image moving apart from each other?(c) If David is 180 cm tall, how tall is his image in the mirror?
What will be an ideal response?
(a) 5.0 cm (b) 3.0 m/s (c) 180 cm
Physics & Space Science
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A. 1 A
B. 2 A
C. 3 A
D. 4 A
E. 5 A
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Humans have existed on Earth for about _____
A) 4 million years B) 5 million years C) 6 million years D) 7 million years
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Elastic Collisions: A 340-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 300-g cart. What is the speed of the 300-g cart just after the collision?
A. 0.0781 m/s B. 1.33 m/s C. 0.625 m/s D. 1.25 m/s E. 0.664 m/s
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In a region where the electric field is axial but the charge density is zero, what is Es (if C is some constant)?
A. C/s2 B. C/s C. zero E. Cs F. Cs2 T. None of the above
Physics & Space Science