Dust is an important part of the nebular theory of solar system formation because dust is needed to explain
A) how the inner planets came to be rocky bodies.
B) how the outer planets came to be gaseous bodies.
C) how the initial cloud cooled enough to collapse.
D) how the initial cloud heated as it contracted.
E) why the icy bodies are located so far from the Sun.
A
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When a ball thrown straight upwards reaches the very top of its path, its acceleration is
A) zero. B) 5 m/s2. C) 10 m/s2. D) none of the above
Propped cantilever beam AB has moment M1 applied at joint B. Framework ABC has moment M2 applied at C. Both structures have constant flexural rigidity EI. If the ratio of the applied moments M1/M2 5 3/2, the ratio of the reactive moments MA1/MA2 at clamped support A is approximately:
(A) 1
(B) 3/2
(C) 2
(D) 5/2
RC Circuits: For the circuit shown in the figure, C = 12 µF and R = 8.5 M?. Initially the switch S is open with the capacitor charged to a voltage of 80 V. The switch is then closed at time t = 0.00 s. What is the charge on the capacitor, when the current in the circuit is 3.3 µA?
A. 350 µC B. 340 µC C. 480 µC D. 620 µC E. 700 µC
The point in time at which oxygen started to build up in the Earth's atmosphere is referred to as the
A) great oxidation event B) great oxygen crisis C) great oxygenation event D) great photosynthetic event