The Large Optics Diamond Turning Machine at the Lawrence Livermore National Lab in California can cut a human hair lengthwise 3000 times! That
would produce pieces with a cross-sectional area of 10−7mm2. A 1.0 m long silver wire with this cross-sectional area would have a resistance of 160 kΩ. Consider three pieces of silver wire connected in series. If their lengths are 2.0 m, 3.0 m, and 7.5 m, and the resistance of each wire is proportional to its length, what is the equivalent resistance of the connection?

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

i don't understand. explain it clearly

truck y has a greater velocity than truck x.