Atrain 471 m long is moving on a straight track with a speed of 75.1 km/h. the engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 15 km/h. assuming constant acceleration, determine how long the train blocked the crossing. disregard the width of the crossing. answer in units of s.

Explanation:

As we know that train is initially moving with the speed

now we know that

now the final speed of the train when it crossed the crossing

now we can use kinematics here

Now the time to cross that junction is given as

b.

explanation:

10.0

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.