Why is the southern hemisphere of Mars believed to be older than the northern?
A) The southern hemisphere is darker much like the lunar mare.
B) The southern hemisphere is more heavily cratered.
C) The northern hemisphere is higher, due to the Tharsis Bulge.
D) The northern hemisphere leans more away from the Sun in winter.
E) The south polar cap is much thicker than the north one.
B
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When a vertically falling firecracker bursts, the vector sum of momentum fragments
A) in the horizontal direction cancels to zero. B) in the vertical direction equals the momentum of the firecracker before bursting. C) both of these D) neither of these
One of the fundamental ideas in the development of quantum mechanics was that
A. no two particles can have the same energy. B. all particles have wave properties. C. electrons and protons are the only particles D. all particles are formed by the interaction of electromagnetic waves. with mass.
The attractive force between protons and neutrons in the nucleus is brought about by the exchange of a virtual pi-meson (m? = 140 MeV/c2). Estimate the longest time a ? can exist in accordance with the uncertainty principle ?E??t = h/2?. (h/2? = 1.05 × 10^?34 J?s, 1 eV = 1.6 × 10^?19 C)
a. 3.3 × 10^?18 s b. 2.4 × 10^?21 s c. 4.7 × 10^?24 s d. 6.9 × 10^?27 s
A person pushes horizontally on a heavy box and slides it across the level floor at constant velocity. The person pushes with a 60.0 N force for the first at which time he begins to tire
The force he exerts then starts to decrease linearly from 60.0 N to 0.00 N across the remaining How much total work did the person do on the box? A) 619 J B) 826 J C) 495 J D) 925 J