If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity, the object
A) accelerates in the direction of the applied force.
B) accelerates opposite the direction of the applied force.
C) experiences greater friction.
D) none of the above
Answer: A
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Since atoms are mostly empty space, why don't objects pass through one another?
A) The electrons on the atoms repel other electrons on other atoms when they get close. B) The nucleus of one atom repels the nucleus of another atom when it gets close. C) The nucleus of one atom attracts the nucleus of a neighboring atom to form a barrier. D) The electrons of one attract the nucleus of a neighboring atom to form a barrier.
Which of the following reactions is the second reaction in the proton-proton chain?
A) 1H + 1H ? 2H + e+ + ? B) 2H + 2H ? 4He + e+ + ? C) 2H + 1H ? 3He + ? D) 3He + 3He ? 4He + 1H + 1H
According to the law of reflection, a light ray striking a mirror at an angle of incidence of 30 degrees will leaves the mirror at an angle of
a. 60 degrees b. 30 degrees c. less than 30 degrees d. none of the above
Which of the following energy forms is associated with an object due to its position?
a. potential b. positional c. total d. kinetic