You pull with a 15 N force on a rope tied to a 12 kg sled on ice. Assume the system is frictionless.

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

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?