A typical NASCAR track has drivers racing on a 1.5 mile oval for 400 miles in about 2.4 hours. Each of the 2 turns has a radius of 200m, and a driver can negotiate each semicircle in about 8.3 sec. Calculate a driver’s:
1.average speed (in m/s) for entire race.
2.speed (m/s) around each curve.
3.acceleration (m/s2) around each curve
.4.centripetal force acting on a 65 kg driver in the turn.

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?