A particle is moving at constant velocity. Its position at t = 1.0 s is 3.0 m and its position at t = 4.0 s is 15.0 m. What is the slope of the position-time graph for this particle?
a. 0, since this is a constant velocity situation.
b. 4.0 m/s
c. 4.0 m/s2
d. 9.0 m/s
e. 12 m/s2
B
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If the spiral density wave were the only thing producing spiral arms, it would be expected that
a. all spiral arms would be gas and dust free. b. all galaxies would have only two smooth spiral arms. c. the Milky Way would show and irregular pattern of short arms . d. the Milky Way wouldn't have any spiral arms. e. the halo component of the Milky Way would show spiral arms as well.
In what way did Galileo improve on the physics of Aristotle?
A) Galileo understood that "natural" (or unforced) motion occurs at constant velocity. B) Galileo understood that energy is always conserved in every physical process. C) Galileo understood that the gravitational force acts between every pair of objects in the universe. D) Galileo understood that a force is needed to keep an object moving at constant velocity. E) Galileo understood that no force is needed to keep an object moving in a circle at constant speed.
A boat with mass 950 kg is heading into the harbor at a speed of 10.0 m/s. How much work is required to slow the boat to 1.0 m/s?
a. 4.8E+4 J b. 9.4E+4 J c. 4.7E+4 J d. 2.3E+4 J
Young Earth developed a layered structure under the influence of
A) impact heating and convection in its interior. B) gravitational contraction and radioactive decay. C) meteorite bombardment. D) gravity and density segregation—the process of differentiation.