Which statement about asteroids is not true?
A) If we could put all the asteroids together, they would make an object about the size of Earth.
B) Many but not all orbit the Sun in the asteroid belt.
C) Some are more like loosely bound piles of rubble than solid chunks of rock.
D) Most asteroids are not spherical in shape.
A) If we could put all the asteroids together, they would make an object about the size of Earth.
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The interstellar clouds called molecular clouds are
A) the cool clouds in which stars form. B) the clouds in which elements such as carbon, nitrogen, and oxygen are made. C) the clouds that are made mostly of complex molecules such as carbon dioxide and sulfur dioxide. D) the hot clouds of gas expelled by dying stars.
An object is placed 15 cm in front of a concave mirror with a focal length of 30 cm. What is the magnification?
A. 1 B. 2 C. 1/2 D. 1/4 E. ?2
A fully charged parallel-plate capacitor remains connected to a battery while a dielectric is slid between the plates. Does C increase, decrease, or stay the same?
1.increase 2.decrease 3.remains the same
A planet is much brighter than the star it orbits
a. True b. False Indicate whether the statement is true or false