The sketch shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence, while (c) and (d) represent only small parts of the main sequence. Which group represents stars that are cool and dim?

A) a
B) b
C) c
D) d
E) e


D) d

Physics & Space Science

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What is the peak (maximum) power dissipated by a 150 W light bulb attached to a 120 V rms ac line?

A. 301 W B. 212 W C. 150 W D. 106 W E. 75.0 W

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Shield volcanoes, like those on Venus and Mars, occur ____

a. over a hot spot b. along a subduction zone c. Inside a chamber d. along plate boundaries e. within a caldera

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Vision Problems: What is the power of a lens that has a focal length of -40 cm and a width of 2.0 cm?

A. -2.5 diopters B. -0.50 diopters C. +4.0 diopters D. +2.5 diopters E. -50 diopters

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The coefficient of linear expansion of copper is 17 × 10-6 K-1 and that of steel is 12 × 10-6 K-1. At 12°C a steel rod has a diameter of 2.540 cm and a copper pipe has a diameter of 2.536 cm

Which one of the following quantities is closest to the temperature to which the copper pipe must be heated in order for the unheated steel rod to fit snugly in the copper pipe? A) 105°C B) 93°C C) 81°C D) 53°C E) 143°C

Physics & Space Science