The _________ stars are giant stars fusing helium in their cores and then in their shells
a. turnoff-point
b. main-sequence
c. turnon-point
d. hydrogen-flash
e. horizontal-branch
e
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Vision Problems: A machinist with normal vision has a near point at 25 cm. This machinist wears +4.25-diopter eyeglasses in order to do very close work. With these eyeglasses, what is the near point of the machinist? Assume that he wears the glasses extremely close to his eyes.
A. 12 cm B. 10 cm C. 7 cm D. 15 cm E. 17 cm
Coulomb's Law: Four point charges of varying magnitude and sign are arranged on the corners of the square of side d as shown in the figure. Which one of the arrows shown represents the net force acting on the point charge with a charge +Q?
A. A B. B C. C D. D
Asteroids are thought to be
a. the remains of a planet between Mars and Jupiter that broke up. b. escaped small moons. c. leftover planetesimals from the inner solar system. d. leftover planetesimals from the outer solar system.
Of the temperature ranges below, which range represents the smallest range of actual temperature?
A) 50-100° Kelvin B) 50-100° Celsius C) 50-100° Fahrenheit D) They all represent the same change in temperature.