A lens of focal length 25 cm is placed 50 cm from an object. On the opposite side of the lens at a distance of 50 cm is a plane mirror. Where is the final image formed?
A)
50 cm from the lens on the object side
B)
35 cm behind the mirror
C)
35 cm in front of the mirror
D)
50 cm from the lens on the mirror side
E)
35 cm from the lens on the object side
A
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An uncharged pith ball is suspended by a nylon fiber. When a negatively-charged rubber rod is brought near the pith ball, without touching, the ball
A) becomes charged by induction. B) becomes polarized. C) is repelled by the rod. D) is unaffected. E) none of the above
If a fluid does not change density as it moves, the fluid is undergoing
A) laminar flow. B) turbulent flow. C) irrotational flow. D) steady flow. E) incompressible flow.
Two masses collide and stick together. Before the collision, one of the masses was at rest. Is there a situation in which the kinetic energy is conserved in such a collision?
a. Yes, if the less massive particle is the one initially at rest. b. Yes, if the more massive particle is the one initially at rest. c. Yes, if the two particles have the same mass. d. No, kinetic energy is always lost is such a collision.
A spaceship of mass 106 kg is to be accelerated to 0.60c. How much energy does this require?
a. 2.3 × 10^22 J c. 2.5 × 10^23 J b. 6.0 × 10^22 J d. 1.5 × 10^23 J