Two weights are connected by a massless wire and pulled upward with a constant speed of 1.50 m/s by a vertical pull P. The tension in the wire is T (see figure). P is closest to
A) 25 N.
B) 125 N.
C) 187.5 N.
D) 245 N.
E) 1225 N.
Answer: B
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How can a star that has more mass than our sun be smaller than our sun?
One problem with the planetary model of the atom is that it
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Two square air-filled parallel plates that are initially uncharged are separated by 1.2 mm, and each of them has an area of 190 mm2. How much charge must be transferred from one plate to the other
if 1.1 nJ of energy are to be stored in the plates? (?00 = 8.85 × 10-12 C2/N ? m2) A) 56 pC B) 39 pC C) 78 pC D) 3.5 µC