Which of the following provides evidence for active volcanism on Venus today and in the past?
A) the direct observation of erupting volcanoes from orbit
B) the presence of sulfuric acid clouds in the atmosphere
C) the detection from orbit of elevated levels of infrared radiation from volcanic features on the surface
D) Both B and C
D
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Two forces are the only forces acting on a 3.0-kg object which moves with an acceleration of 3.0 m/s2 in the positive y direction. If one of the forces acts in the positive x direction and has a magnitude of 8.0 N, what is the magnitude of the other force?
a. 12 N b. 14 N c. 16 N d. 18 N e. 22 N
Which of these are good conductors?
A) feathers. B) wood. C) snow. D) all the above E) none of the above
An iron ball and wooden ball of the same size are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater
A) speed. B) acceleration. C) momentum. D) all of the above E) none of the above
Newton's modification of Kepler's Third Law lets us measure the mass of the Sun
Indicate whether the statement is true or false