1)An object is 5.7 cm from a spherical concave mirror. If the image is 4.7 cm ta

Question

1)An object is 5.7 cm from a spherical concave mirror. If the image is 4.7 cm tall and 10cm from the mirror, how tall is the object?

A)11cm

B)8.2cm

C)2.7cm

D)12cm

2)A negatively charged rod is brought near a second rod that is neutral and suspended by a nonconducting string. This second rod begins to move toward the negitive rod, showing attraction between the two rods. After the first rod is removed, the second rod,

A)has no net charge

B)has a positive net charge

C) has a negitive net charge

D) is polarized with on end negative and the other positive.

Explanation / Answer

1)
s = 5.7 cm
h' = 4.7 cm
s' = 10 cm
use:
h'/h = s'/s
4.7/h = 10/5.7
h = 2.7 cm
Answer: C

2)
Since there is no charge transfer, 2nd rod was charged by induction
when 1st is removed, 2nd rod will be uncharged
Answer:
A) has no net charge

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