In the atom:
a. the positively charged nucleus attracts the negatively charged electrons.
b. the negatively charged nucleus attracts the positively charged electrons.
c. the strong nuclear force counteracts the attraction between the electrons and the nucleus.
d. the electrical forces do not act within atoms.
e. the nucleus and the electrons can either both be positive or both be negative.
a
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Why does the burning of fossil fuels increase the greenhouse effect on Earth?
A) Burning depletes the amount of ozone, thereby warming the planet. B) Burning fuel warms the planet. C) Burning produces infrared light, which is then trapped by existing greenhouse gases. D) Burning releases carbon dioxide into the atmosphere. E) All of the above are true.
Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by
A) conduction. B) condensation. C) evaporation. D) melting.
If an antimatter meteor of mass m were to strike the Earth, the amount of radiant energy produced would be
A) less than mc2. B) mc2. C) 2mc2. D) none of the above
A 188-pound astronaut in a training exercise experiences an acceleration of 7.2 g's. What is the net force (in newtons) acting on the astronaut?
a. 1,353.6 N b. 6,023.5 N c. 59,030.5 N d. 13,536 N