Atrain consists of 50 cars, each of which has a mass 6.8
x10^3 kg. the train has an acceleration of +8.0 x 10^-2m/s^2.
ignore friction and determine the tension in thecoupling a) between
the 30th and 31st cars and b) between the 49thand 50th cars.

Explanation:

Given

mass of each car

acceleration of train

Force required to pull this system

For first car

for second car

this form a pattern of the form

for (a)30 th and 31 st car tension

For 49 th and 50 th car

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.