1) The resistance can be found according to Ohm's law:
"R=V\/I=120\/12=10\\space\\Omega." 2) The speed is
"v=\\lambda\\space\\nu=0.005\\cdot10000=50\\text{ m\/s}." 3) The electric force can be found according to Coulomb's law:
"F=k\\frac{q_1q_2}{r^2}=9\\cdot10^9\\frac{5\\cdot5}{15^2}=1\\cdot10^9\\text{ N}." 4) The work done while the mass was falling from 2 meters:
"W=mgh=m\\cdot9.8\\cdot2=19.6m." While the body was falling within 11 s:
"W=mgh=mg\\cdot gt^2\/2=m(gt)^2\/2=5810m." 5) The potential energy is
"PE=mgh=5\\cdot9.8\\cdot10=490\\text{ J}." The kinetic energy and momentum are:
"KE=mv^2\/2=160\\text{ J}.\\\\\np=mv=40\\text{ kg-m\/s}." the force and impulse:
"F=\\Delta p\/\\Delta t=(40-0)\/4=10\\text{ N}.\\\\\nJ=\\Delta p=40-0=40\\text{ kg-m\/s}."
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