(20 points) The magnetic field in the Flint, MI area is about 50 µT pointed downward and to the north at about a 20° angle with respect to vertical. For the purposes of this problem, these values can be treated as exact. Consider an MD-80 airplane (wingspan 32.873 m) flying due east, coming in for a landing on runway 9 at Bishop Airport at 120 knots (61.7 m/s). (a) What is the electric potential difference across the wingtips? (You may assume level flight.) (b) You decide to connect a 10-Ω resistor across the wingtips. What is the magnitude and direction of the current through the wire? (c) What is the magnitude and direction of the magnetic force on the wire (you may assume the wire is the same length as the wingspan). For all parts, justify your reasoning.

  1.the balanced   chemical equation is as below

cu +   2 ag(no)₃ → cu(no₃)₂   +2 ag

2.the   much silver   produced   is   50.9 g

step 1: find the   moles of cu

moles =   mass÷   molar mass

  from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236   moles

step 2: use the mole ratio to determine the   moles of ag

from equation above   cu: ag   is 1: 2

therefore the moles of ag   =0.236   moles   x 2/1 =0.472   moles

step 3: find the mass   of ag

mass = moles x molar mass

from periodic table   the molar mass of ag =107.87 g/mol

mass   = 0.472   moles x 107.87 g/mol = 50.9 g

3.   the   much   silver   collected worth is   1.797 oz

  convert   50.9 g   to oz

that is   1 gram = 0.0353 oz

          50.9 grams =?   oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1   gram}   =1.797 oz

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.