Which of the following does not provide evidence that Mars once had large amounts of liquid water on its surface?
A) the presence of what looks like dried-up riverbeds
B) the presence of impact craters that appear to have formed in mud
C) the vast canal system described by Percival Lowell
D) the presence of minerals, dry clay, and sedimentary rock that form in water
E) some very old craters that appear to have been eroded by rain
C) the vast canal system described by Percival Lowell
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Causing an object to start moving on a frictional surface requires
A. less force than is needed to keep it moving on the surface. B. the same force as is needed to keep it moving on the surface. C. more force than is needed to keep it moving on the surface. D. a force equal to the weight of the object. E. a force opposite to the normal force.
The equation of motion of a particle undergoing simple harmonic motion in the y direction is y = (2.0 cm) sin(0.60 s-1 t)
At time t = 0.60 s determine the particle's (a) position, (b) velocity, and (c) acceleration.
For a point on a spinning disc in uniform circular motion, which of the following is not constant?
a. Its angular speed. b. Its angular acceleration. c. Its centripetal acceleration. d. The magnitude of its total acceleration.
In what kind of path would the planets move if no force acted on them?
A) Parabolas, like a thrown rock. B) Straight line with an acceleration of 10 m/sec2. C) Straight line with no acceleration. D) Larger elliptical orbits. E) They would continue in their present orbits, since they already have no force on them.