The Earth's core has a density of _____
A) 5.5 g/cm3
B) 10.5 g/cm3
C) 14 g/cm3
D) 18.5 g/cm3
C
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A cylindrical capacitor is made of two thin-walled concentric cylinders. The inner cylinder has radius r1 = 4.0 mm, and the outer one a radius r2 = 8.0 mm. The common length of the cylinders is L = 150 m
What is the potential energy stored in this capacitor when a potential difference 4.0 V is applied between the inner and outer cylinder? (k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 9.6 × 10-8 J B) 1.3 × 10-8 J C) 6.3 × 10-8 J D) 0.34 × 10-8 J E) 4.6 × 10-8 J
If you were to cut a small permanent bar magnet in half,
A) neither piece would be magnetic. B) one piece would be a magnetic north pole and the other piece would be a south pole. C) each piece would in itself be a smaller bar magnet with both north and south poles. D) None of these statements is true.
Starting with a sample of pure parent radionuclide, what would be the ratio of the parent radionuclide to its daughter after one half-life has elapsed?
a. 1 to 1 b. 1 to 2 c. 1/2 to 1 d. 2 to 1
Determine the energy stored in C2 when C1 = 15 ?F, C2 = 10 ?F, C3 = 20 ?F, and V0 = 18 V
a.
0.72 mJ
b.
0.32 mJ
c.
0.50 mJ
d.
0.18 mJ
e.
1.60 mJ