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Transcribed Image Text:9. An astronomer on earth observes two spacecraft moving away from each other along an axis
that passes through the earth. The astronomer measures the speed of each spacecraft to be
0.875c relative to the earth. At what speed are the spacecrafts moving apart relative to each
other?
a) 0.496c
b) 0.467c
c) 1.750c
d) 0.143c
e) 0.991c
10. How far apart must two objects on the moon be to be resolved by a telescope which has a
7.80-m diameter mirror? The wavelength of the light used is A610 nm, and the distance
to the moon to be 3.80 x 105 km.
a) 24.4 m
b) 29.7 m
c)
36.3 m
d) 72.5 m
e) 12.2 m
11. A converging lens with a focal length of (f₁ = 32.0 cm) is placed 42.0 cm to the left of a
diverging lens with a focal length of (f2 = -25.5 cm). An object is placed 40.0 cm to the left
of the converging lens. What is the location of the image produced by the combination of
lenses?
a) 32.5 cm to the right of the diverging
lens
b) 32.5 cm to the left of the diverging lens
c) 160 cm to the left of the diverging lens
d) 160 cm to the right of the diverging
lens
e) 118 cm to the left of the diverging lens
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