the Olympic flame at the 1992 Barcelona Olympic was lit by a flaming arrow shot from a point located 60 meter horizontally and 24 meter vertically from the flame. find the initial speed necessary for the arrow to reach the at the peak of its trajectory?

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?