By what length will a slab of concrete that is originally 18 m long contract when the temperature drops from 24°C to -16°C? The coefficient of linear thermal expansion for this concrete is 1.0 × 10-5 K-1
A) 0.50 cm
B) 0.72 cm
C) 1.2 cm
D) 1.5 cm
B
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In the context of main-sequence stars, which of the following statements is true of a mass-luminosity relation?
A) The main-sequence stars in a Hertzsprung-Russell diagram are not ordered according to their masses. B) The lowest-mass stars are the hottest and brightest main-sequence stars. C) It is followed by giants, supergiants, and white dwarfs. D) The more massive a star is, the more luminous it is.
Which of the following best describes the orbits of stars in the halo?
A) Halo stars have orbits confined to a relatively thin plane. B) Halo stars have elliptical orbits, with random orientations. C) Halo stars have elliptical orbits, but all orbiting in the same direction. D) Some halo stars orbit around the galactic center but others never pass through the plane of the galactic disk. E) Halo stars orbit the centers of their globular clusters, but do not orbit the center of the galaxy.
Hipparchus measured accurate star positions and so discovered
What will be an ideal response?
A circular loop of wire of radius 10 cm carries a current of 6A. The magnitude of the magnetic field at the center of the loop is
A) 3.8 × 10-5 T. B) 3.8 × 10-7 T. C) 1.2 × 10-5 T. D) 1.2 × 10-7 T. E) 3.8 × 10-8 T.