(03.01 mc) which substance will cool down the slowest during the night, and why? seawater, because it heats up faster but gives away heat slower than sand. seawater, because it heats up slower and gives away heat slower than sand. sand on the shore, because it heats up faster but gives away heat slower than water. sand on the shore, because it heats up faster and gives away heat faster than water.

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?