An object of weight W is in free-fall close to the surface of Earth. What is the force that the object exerts on Earth?
A)
a force greater than W
B)
a force less than W
C)
a force equal to W
D)
no force at all
E)
cannot be determined without additional information
C
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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
If the distance from the Sun to the Earth is represented by roughly 15 meters, then the distance from Earth to the Moon on the same scale would be
a. about 30 meters. b. about 10 meters. c. about 1 meter. d. small than your hand.
For a diatomic quantum mechanical vibrator, the energy difference between adjacent quantum states
A) increases as the integer v increases. B) decreases as the integer v increases. C) varies randomly as the integer v increases. D) is constant for all values of the integer v.
Which of the following provides important evidence for the existence of dark matter in clusters of galaxies?
A) careful counts of the numbers of galaxies in clusters B) the relative proportions of spiral and elliptical galaxies in clusters C) the high temperature and distribution of gas between the galaxies in clusters D) the total luminosity in visible light coming from cluster galaxies