Currents in dc transmission lines can be 100 a or more. some people have expressed concern that the electromagnetic fields (emfs) from such lines near their homes could cause health dangers. then use your estimate to calculate the strength of the magnetic field these lines produce at ground level. express your answer in teslas and as a percent of the earth's magnetic field (which is 0.500 gauss ).

Ablock of mass m slides on a horizontal frictionless table with an initial speed v0 . it then compresses a spring of force constant k and is brought to rest. the acceleration of gravity is 9.8 m/s2. how much is the spring compressed x from its natural length? 1) x = v0*sqrt(k/(mg)) 2) x=v0*sqrt(m/k) 3) x=v0*((mk)/g) 4) x=v0*sqrt(k/m) 5) x=v0*(m/kg) 6) x=v0*sqrt((mg)/k) 7) x=(v0)^2/(2g) 8) x=v0*(k/(mg)) 9) x=(v0)^2/(2m) 10) x=v0*((mg)/k)