What is thought to be the reason that there are no small impact craters on Mars?
A) Like Venus, Mars' atmosphere is too thick and these meteorites do not survive to make impacts on the surface.
B) The surface of Mars is too young to have impact craters.
C) Due to the gravitational pull of Mars' moons, most small meteoroids are deflected and never make it to the surface.
D) The wind blows small dust particles, eroding the surface of Mars, erasing small impact craters faster than they can form.
E) None of the above. Mars has lots of small impact craters.
D
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Three kids pull on a toy. Kim pulls with a force of 30 N north, Jim pulls with a force of 30 N south, and Tim pulls with a force of 15 N east. The acceleration of the toy is
A) 10 m/s2. B) 15 m/s2. C) 33 m/s2 D) need more information
A student has written the equation below to convert a temperature in degrees Fahrenheit into Kelvins. What is wrong with this equation?
?
?
A.
.B.
should multiply (T(ºF) ? 32).C.
D.
E.
In a reversible cycle
1.the change in the entropy of the system (measured over the whole cycle) is always zero. 2.the change in the entropy of the system (measured over the whole cycle) may be zero, but it isn't necessarily always zero. 3.The change in the entropy of the system (measured over the whole cycle) is always greater than zero. 4.The change in the entropy of the system (measured over the whole cycle) is always less than zero.