Symbolic equation for the error propagation of: λ = d*(x/√(x2 +l2))/m
∆sλ = ?
where x & l have uncertainties of 0.001 and 0.003,
s = uncertainty

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.

the right answer is 0.3 meters per second

the moving of the box is a result of centripetal force. think of that  as a car or a truck in this case creates a turn, the force of friction performing upon the turned wheels of the car runs centripetal force obligatory for circular motion for the things inside it.