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Phy 102 Exam 3 Zane 2007

# Phy 102 Exam 3 Zane 2007 - 1 The gravitational field of a...

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[ 1] The gravitational field of a star causes light to bend, so the star behaves very much like [A] a diverging lens. [B] a converging lens. [C] a prism. [D] A star does not cause light to bend. [ 2] The image distance of a meniscus convex lens for an object 3.0 f away from the lens (where f is the focal length) is [A] 1.5 f [B] 2.0 f [C] 2.5 f [D] 3.0 f [E] 4.5 f 1 f = 1 d o + 1 d i d i = 1 f - 1 d 0 - 1 = 1 f - 1 3f - 1 = 2 3f - 1 = 1.5f [ 3] To what radius would the Sun have to be condensed in order for it to become a black hole? [A] 1470 m [B] 2950 m [C] 37,200 m [D] 7,330,000 m [E] 696,000,000 m R Schwarzschild = 2GM c 2 = 2(6.67 x10 - 11 N m 2 / kg 2 )(2.00x10 30 kg) 9x10 16 m 2 / s 2 = 2964m [ 4] A nearsighted person has a far point that is 2.1 m from his eyes. What is the focal length of his contact lenses that will allow him to focus on distant objects? [A] -2.1 m [B] 2.1 m [C] -2.6 m [D] 2.6 m [E] none of these 1 f = 1 d o + 1 d i = 1 + 1 ( - 2.1m) f = - 2.1m [ 5] An object 4.0 cm in height is placed 8.0 cm in front of a concave mirror of focal length 10.0 cm. What is the position of its image in relation to the mirror, and what are its characteristics? [A] 10.0 cm on the other side of the mirror, virtual, 10.0 times bigger [B] 10.0 cm on the same side of the mirror, real, 6.0 times bigger [C] 40.0 cm on the other side of the mirror, virtual, 5.0 times bigger [D] 40.0 cm on the other side of the mirror, real, 6.0 times bigger [E] None of the above 1 f = 1 d o + 1 d i d i = 1 f - 1 d 0 - 1 = 1 10.0cm - 1 8.0cm - 1 = - 40cm m = - d i d o = - ( - 40cm) (8cm) = 5 [ 6] A spy satellite is in orbit at a distance of 5.0x10 5 m above the ground. It carries a telescope that can resolve the two rails of a railroad track that are 1.4 m apart using

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light of wavelength 600 nm. Which one of the following statements best describes
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Phy 102 Exam 3 Zane 2007 - 1 The gravitational field of a...

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