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
You might also like to view...
How can a star that has more mass than our sun be smaller than our sun?
In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow), we expect the term fciv to be small if ________
A) most of the civilizations that have ever existed are still out and about in the galaxy B) primitive life is common but intelligent life is rare C) most habitable planets never actually get life on them D) most civilizations destroy themselves within just a few hundred years of arising
One problem with the planetary model of the atom is that it
A) cannot explain boiling, freezing, and other transitions between the three common states of matter. B) cannot explain electrical effects. C) cannot explain the observed spectrum of the various types of atoms.
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