The greenhouse effect keeps Venus hot because
a. the atmosphere contains free oxygen.
b. the atmosphere is predominently carbon dioxide.
c. the surface converts infrared into visible radiation.
d. the surface is free of sulfur compounds.
e. the magnetic field traps a large number of particles from the solar wind.
B
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Neutron stars have densities roughly the same as that of the atomic nucleus
Indicate whether the statement is true or false
A "GUT" (grand unified theory) refers to theories that
A) unify gravity with the strong and weak forces. B) unify the electromagnetic and weak forces. C) unify all four forces together. D) unify the strong force with the electromagnetic and weak forces.
A 5.00-kg box slides 4.00 m across the floor before coming to rest. What is the coefficient of kinetic friction between the floor and the box if the box had an initial speed of 3.00 m/s?
A) 1.13 B) 0.587 C) 0.115 D) 0.229 E) 0.267
As an interstellar cloud of hydrogen gas shrinks in size, its temperature increases
A) because thermal energy is converted to radiative energy. B) because kinetic energy is converted to radiative energy. C) because gravitational potential energy is converted to thermal energy.