A physics teacher (mass = 80.4 kg) is jogging through the woods and runs straight

12777.86N

Explanation:

This problem is approached by understanding that the impulse felt by the physics teacher is equal to his change in momentum. This is mathematically represented as follows;

where m is his mass, v is his final velocity, u is his initial velocity, t is the time for which the force F acts on him.

It should also be noted that while he rebounds there is a change in his direction and that is why the mu carries a negative sign.

Equation (1) can therefore be written as,

equation (2) is a statement of Newton's second law of motion.

Given;

m = 80.4kg

u = 4.9m/s

v = 4.0m/s

t = 56 milliseconds = 0.056s

Therefore;

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the centre of the coil.

Explanation: