According to the nebular theory, what are asteroids and comets?
A) leftover planetesimals that never accreted into planets
B) chunks of rock or ice that condensed long after the planets had formed
C) the shattered remains of collisions between moons
D) the shattered remains of collisions between planets
E) chunks of rock or ice that have been expelled from the planets by volcanoes
A) leftover planetesimals that never accreted into planets
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What does chromatic aberration separate within refracting telescopes?
a. color b. lenses c. images d. photons e. focal points
The centroid of the semicircular segment shown in the figure below (b 5 6 in.) is at coordinates (x, y)(in.):
(A) 4.5, 3.0
(B) 6.0, 4.0
(C) 5.5, 3.5
(D) 6.0, 3.23
The stride of a horse would be quicker if more mass in its legs were concentrated
A) in the upper part, nearer the horse's body. B) towards its feet. C) halfway up its legs. D) uniformly all along its legs. E) none of the above
A 55-cm brass rod has a diameter of 30 cm. The compressive strength of steel is 250 × 106 N/m2. What is the compression force that would break the rod?
A) 1.8 × 107 N B) 2.4 × 107 N C) 1.4 × 108 N D) 2.4 × 108 N E) 4.5 × 108 N