In July 2011, the Dawn probe entered orbit around
A) the comet Wild.
B) the asteroid Ida.
C) the asteroid Ceres.
D) the asteroid Gaspra.
E) the asteroid Vesta.
E
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Where do scientists find the key evidence linking the extinction of the dinosaurs to the impact of an asteroid or comet?
A. in sediments that surround a large crater in Mexico B. in sediments separating rocks from the time when dinosaurs existed from those deposited after dinosaurs were no longer found C. in rock brought up by drilling deep into Earth's mantle D. in sediments found on the ocean bottom near mid-ocean ridges E. in rocks returned from craters on the Moon
Consider a monkey wrench released at rest at the far edge of the solar system. Suppose that it drops to Earth by virtue of only Earth gravity. It will strike Earth's surface with a speed of about
A) 10 m/s. B) 8 km/s. C) 11.2 km/s. D) the speed of light.
A spaceship visits a star that is 4.5 light-years from Earth, and the spaceship travels at one-half the speed of light for the entire trip
(a) How long did the trip take according to an observer on Earth? (b) How long did the trip take according to an observer on the spaceship?
Which was one of the basic principles from which Newton derived the law of gravity?
a. That heavenly motions should follow the same rules as motions on earth. b. That the Sun revolves around the Earth. c. That the Moon revolves around the Sun. d. That objects in motion tend to come to rest. e. That what goes up must come down.