Amotorcycle and rider have a total mass equal to 300kg. the rider applies the brakes, causing the motorcycle to accelerate at a rate of -5 m/s. what is the net force on the motorcycle?

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?