Grandfather clocks are designed so they can be adjusted by moving the weight at the bottom of the pendulum up or down. Suppose you have a grandfather clock at home that runs fast
Which of the following adjustments of the weight would make it more accurate? (There could be more than one correct choice.)
A) Decrease the amplitude of swing by a small amount.
B) Add more mass to the weight.
C) Lower the weight.
D) Raise the weight.
E) Remove some mass from the weight.
C
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You and your friend both solve a problem involving a skier going down a slope, starting from rest. The two of you have chosen different levels for y = 0 in this problem. Which of the following quantities will you and your friend agree on?
A) skier's PE B) skier's change in PE C) skier's final KE a) only B b) only C c) A, B, and C d) only A and C e) only B and C
Without telescopes or other aid, we can see the Moon because it
A) emits visible light. B) emits thermal radiation. C) reflects infrared light. D) reflects visible light. E) glows through radioactive decay.
Why might increasing the concentration of a set of reactants increase the rate of reaction?
A) You have increased the chances that any two reactant molecules will collide and react. B) You have increased the ratio of reactants to products. C) The concentration of reactants is unrelated to the rate of reaction. D) The rate of reaction depends only on the mass of the atoms and therefore increases as you increase the mass of the reactants. E) none of the above
The universe as a whole is
A) curved. B) flat. C) the shape of a saddle. D) has yet to be determined, although most astrophysical data points to a flat universe.