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Multiple Choice
A boy is pulling a load of 150N with a string inclined at an angle of
30° to the horizontal. If the tension in the string is 105 N, The force
tending to lift the load off the ground is (sin30=%,cos30=
13/2 and tan 30 = 1/13)
O (a)255N
O (b)202.5N
O (c)105/3/2N
O (e)52.5N

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)