Is there any actual evidence that our solar system originate from a collapsing cloud of gas, as described in the textbook?
A) Evidence comes from observations of Earth's oldest rocks.
B) Evidence comes from observations of gas clouds around new stars elsewhere in our galaxy.
C) Evidence comes from observations of the moon, meteorites, other planets, and other moons.
D) All of the above.
E) No, this description is based only on the theory of gravity and other theories.
Question 2
A 200-N sled of slides down a frictionless hillside that rises at 37 above the horizontal. What is the magnitude of the force that the hill exerts on the sled parallel to the surface of the hill?
A) 200 N
B) 120 N
C) 160 N
D) 150 N
E) 0 N
A Microelectromechanical system
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