Drawing Conclusions Suppose you take a short piece of wire that is not attached to anything and move it up and down in a magneti
2 answers:
Answer: No. Circuit should be closed.
Explanation:
A changing magnetic field induces emf in a circuit which is placed in it. This induced emf causes current to flow through it. This is given by Faraday's law which states that induced emf results due to rate of change of magnetic flux.
Current flows only through a closed circuit. Thus, when a wire is moved up and down in a magnetic field, it will not induce emf because the wire does not form a loop. It is an open circuit.
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Answer:
The force with which the tenth car pulls the eleventh one is called tension and is equal to:
T=119715.91 N
Explanation:
The force (F) with which the tenth car pulls the eleventh one is called tension and its direction is the X-direction or horizontal. According to Newton's Second Law of motion:
That is, the force of the car is equal to the acceleration (a) times its mass (m). The acceleration is the change in the velocity divided by the time (i is for initial and f is for final).
Using Newton's second law:
To find the forces, you have to solve the equilibrium in X-direction:
Now you can substitute the accelertion in terms of velocity and time:
Solve the equation using the data from the problem, remember that the mass of the object is 10 times the mass of one car because the 10th car has to pull all the other cars: