What was the first geological period in Earth's history after the dinosaurs became extinct?
A) The Cretaceous Period
B) The Carboniferous Period
C) The Tertiary Period
D) The Triassic Period
C
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A brass rod (E 5 110 GPa) with a cross-sectional area of 250 mm2 is loaded by forces P1 5 15 kN P2 5 10 kN, and P3 5 8 kN. Segment lengths of the bar are a 5 2.0 m, b 5 0.75 m, and c 5 1.2 m. The change in length of the bar is approximately:
(A) 0.9 mm
(B) 1.6 mm
(C) 2.1 mm
(D) 3.4 mm
Consider a satellite (whose mass is m) orbiting the earth (whose mass is M). If we use the formula Vg = -GMm/r for the gravitational potential energy in this situation, the earth/satellite system’s total energy E turns out to be negative. With respect to the total energy of what situation is E negative?
A. The satellite at rest at the earth’s surface B. The satellite at rest at the earth’s center C. The satellite orbiting just above the earth’s surface D. The satellite at rest at infinity E. Some other situation (specify
Suppose you are playing hockey on a new-age ice surface for which there is no friction between the ice and the hockey puck. You wind up and hit the puck as hard as you can. After the puck loses contact with your stick, the puck will
A) start to slow down. B) speed up a little, and then move at a constant speed. C) not slow down or speed up. D) speed up a little, and then slow down.
When two galaxies collide, what happens to their stars?
A. About 30% of them collide and become black holes. B. The evolution of all the stars in the larger galaxy is accelerated. C. About 50% of them become binary stars. D. Nothing happens to them, except that their orbits may change.