Which force is the strongest within an atomic nucleus?
A) strong
B) weak
C) electromagnetic
D) gravity
E) They are all equal.
A) strong
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Sound: You drop a stone down a well that is 9.5 m deep. How long is it before you hear the splash? The speed of sound in air is 343 m/s and air resistance is negligible.
A. 1.2 s B. 1.3 s C. 1.4 s D. 1.5 s E. 1.6 s
The lookback time of the cosmological horizon is
A) the Big Bang. B) the age of the universe. C) 1 billion years. D) 10 billion years.
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 up out of the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.
As Earth rotates, circumpolar stars appear to move counterclockwise around the north celestial pole
a. True b. False Indicate whether the statement is true or false