3. A force of 150 N is applied at an angle of 53° to a 30 kg box of kittens across a level surface with a coefficient of friction of 0.1 for 8 meters. a. Draw a free body diagram.
b. How much work is done by the applied force?
c. How much work is done by friction?
d. What is the net work done on the box?

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?