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
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A) vacuum. B) wooden rod. C) glass rod. D) rod of iron. E) none of the above
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.
B.
C.
D.
.E.
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A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2 . What is the time interval required for it to reach a 10-rad displacement after starting from rest?
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