During the Mesozoic, the supercontinent of Pangaea fragmented into
A) Laurasia and Gondwanaland.
B) a rift zone between Africa and Europe.
C) the present-day continents we see today.
D) four quadrants.
Answer: A
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General Questions: A box is placed on a table which rests on the floor. The box pushes on the table; the reaction force to the box's push on the table is the table's push on the floor.
A. True B. False
An object travels 7.5 m/s toward the West and under the influence of a constant net force of 5.2 kN, it comes to rest in 3.2 s. What is its mass?
A. 1600 kg B. 12000 kg C. 1100 kg D. 690 kg
A combination of 2.0 ? in series with 4.0 ? is connected in parallel with 3.0 ?. What is the equivalent resistance?
What will be an ideal response?
A 10-?F capacitor in an LC circuit made entirely of superconducting materials (R = 0 ?) is charged to 100 ?C. Then a superconducting switch is closed. At t = 0 s, plate 1 is positively charged and plate 2 is negatively charged. At a later time, Vab = +10 V. At that time, Vdc is
a.
0 V.
b.
3.54 V.
c.
5.0 V.
d.
7.07 V.
e.
10 V.