Answer:
Which of the following... : constant velocity horizontal motion
A ball is thrown at certain... : 0 m/s
I electromagnets, the magnetic field is turned off when there is no induced current. So, electromagnets act as magnets only when current is induced in an insulated wire wrapped around a material mage of ferromagnetic material such as iron core rotating in a magnetic field.
So, option D is the correct one.
If you wanna know more about electromagnets, write down in comments {:
Answer:
5 mm
Explanation:
Youngs's modulus (Y) is described by the following expression:

Where F is the force exerted on the tendon, L is its length, A is its area and ΔL is its change in length (stretching).
The force in this case is 8 times the weight of the runner:

Therefore, the change in length of the tendon is given by:

the runner's Achilles tendon will stretch by 0.004989 m, which is roughly 5 mm.