Answer:
0.906 N
Explanation:
Formula for magnetic force acting on current carrying cable:
Where I = 345A is the current in the wire, B = 
is the magnetic magnitude generated by Earth. L = 46.9 m is the cable length. 
is the angle between vector B and cable direction.
1.7 Btu
1 watt = 3.41214 Btu/h
1watt * 1h = 3.41214 Btu/h * h
1 = 3.41214 Btu/ (watt*h)/
0.5 watt * h = 0.5 watt*h * 3.41214 Btu/(watt*h) = 1.706 Btu
The amount of solid does not affect how you are describing the solid so a is the answer
Yes , increased tension suggests increased molecular attraction between the molecules of the ropes which affect the increase in the speed of wave.
