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.
Question 2
An object is moving with constant non-zero velocity. Which of the following statements about it must be true?
A) The net force on the object is zero.
B) A constant force is being applied to it perpendicular to the direction of motion.
C) A constant force is being applied to it in the direction opposite of motion.
D) A constant force is being applied to it in the direction of motion.
E) Its acceleration is in the same direction as it velocity.
The path of sound waves through the outer, middle, and inner ear.
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