The correct answer is "All of the above".
In fact, electromagnetic induction occurs when there is a change of the magnetic flux through the area enclosed by a circuit (in this case, the area enclosed by the wire loop).
The magnetic flux

through a certain surface is given by

(1)
Where B is the intensity of the magnetic field, A is the area enclosed by the circuit and

is the angle between the direction of the field B and the perpendicular to the area.
In the first situation, the magnet is getting closer to the loop, so the magnetic flux through the area enclosed by the wire is increasing (because the intensity of the magnetic field B is increasing). Situation 2) is the opposite case: the wire loop is moving away from the magnet, so the intensity of the magnetic field B is decreasing, and therefore the magnetic flux is decreasing as well.
Finally, in the third situation the wire loop is rotating. Here the distance between the loop and the magnet is not changing, but remember that the magnetic flux depends also on the angle between the direction of the magnetic field and the perpendicular (formula 1), and so since the wire loop is rotating, than this angle is changing, therefore the magnetic flux is changing as well.
Answer:
a The diagram of the situation is shown on the first uploaded image
b the angle of incidence beam striking the water is 
c the angle of refraction beam striking the water is 
d The angle the refracted beam make with respect to the horizontal is 
e The height of the target above sea level is

Explanation:
From the diagram we see that the angle of the beam striking the water is



According to Snell's law

Where
is the refractive index of water = 1.333
is the angle of incidence
is the refractive index of air = 1
r is the angle of refraction
Substituting values accordingly

Making r the subject of the formula


looking at the diagram we can see that to obtain the angle the refraction beam makes with the horizontal by subtracting the angle refraction from 90°
i.e
°
From the diagram we see that the height target above sea level can be obtained by this relation

Where h is the is the height



The magnetic force experienced by the proton is given by

where q is the proton charge, v its velocity, B the magnitude of the magnetic field and

the angle between the direction of v and B. Since the proton moves perpendicularly to the magnetic field, this angle is 90 degrees, so

and we can ignore it in the formula.
For Netwon's second law, the force is also equal to the proton mass times its acceleration:

So we have

from which we can find the magnitude of the field:
The initial velocity of the stone is 0 ft/s. Given the initial velocity (Vi), final velocity (Vf), and acceleration due to gravity (g), the distance may be calculated through the equation,
d = ((Vf)² - (Vi)²) / 2g
Substituting the known values,
d = ((96 ft/s)² - 0))/ (2x32.2)
The value of d is 143.10 ft.
Answer:
It would take two half-lives which would be 130days
The substance has a half-life of 30 minutes. There has been two cycles that have occurred.
idk the last one
Explanation: