A crate is acted upon by a net force of 100 N. An acceleration of 4.0 m/s2 results. The weight of the crate is

A. 245 N.
B. 25 N.
C. 25 lb.
D. 245 lb.
E. 25 kg.


Answer: A

Physics & Space Science

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Transverse waves y1 = A1 sin(k1x??1t) and y2 = A2 sin(k2x??2t), with A2>A1, start at opposite ends of a long rope when t = 0. The magnitude of the maximum displacement, y, of the rope at any point is

A.

A1?A2.

B.
A2?A1.

C.
A1 + A2.

D.
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E.
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