Lithium, Li-7, contains three protons and four neutrons and has a mass of 7.01600 u. What is the mass defect for this nucleus in atomic mass units?
0.04066 u
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If its parallax is 1", then the distance to the star is ________ light-years
Fill in the blank(s) with correct word
The magnetic field at point P due to a 2.0-A current flowing in a long, straight, thin wire is 8.0 ?T. How far is point P from the wire? (?0 = 4? × 10-7 T ? m/A)
A) 10 cm B) 2.0 cm C) 5.0 cm D) 2.5 cm E) 4.0 cm
In a machine shop, two cams are produced, one of aluminum and the other of cast iron. Both cams have the same mass. Which cam is larger?
1.both cams have the same size 2.cannot tell from the information given 3.the aluminum cam 4.the iron cam
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
a.
A
b.
B.
c.
C.
d.
D.
e.
E.