An iron bar can be made magnetic when __________.
1 answer:
You might be interested in
Answer and work is shown in the image attached.
please mark me brainliest :)
The dashed line represents the<u> normal </u>to the boundary
Explanation:
Refraction is a phenomenon that occurs when a ray of light crosses the interface between two mediums.
When this occurs, the ray of light changes direction and speed.
The new direction of the ray of light is given by Snell's law:
where
is the index of refraction of the 1st medium
is the index of refraction of thre 2nd medium
is the angle of incidence, which is the angle between the direction of the incident ray and the normal to the boundary
is the angle of refraction, which is the angle between the direction of the refracted ray and the normal to the boundary
The index of refraction of a medium is the ratio between the speed of light in a vacuum (c) and the speed of light in that medium (v):
The figure in the question is missing, however you can find it in attachment.
We see that the dashed line is perpendicualr to the boundary between the two mediums, so it represents the normal.
So, the correct answer is
Normal
We note that in this case the ray of light bends towards the normal, this means that , therefore the second medium has a larger index of refraction (
).
Learn more about refraction:
#LearnwithBrainly
To determine the object which could give the greatest impact we will apply the concept of momentum. The object that has the highest momentum will be the object that will impact the strongest. Our values are
Mass of Object A
Velocity of object A
Mass of object B
Velocity of object B
The general formula for momentum is the product between mass and velocity, then
For each object we have then,
Since the momentum of object A is greater than that of object B, then object A will make you feel force upon impact.
(A) We can solve the problem by using Ohm's law, which states:
where
V is the potential difference across the electrical device
I is the current through the device
R is its resistance
For the heater coil in the problem, we know
and 
, therefore we can rearrange Ohm's law to find the current through the device:
(B) The resistance of a conductive wire depends on three factors. In fact, it is given by:
where
is the resistivity of the material of the wire
L is the length of the wire
A is the cross-sectional area of the wire
Basically, we see that the longer the wire, the larger its resistance; and the larger the section of the wire, the smaller its resistance.
where
V is the potential difference across the electrical device
I is the current through the device
R is its resistance
For the heater coil in the problem, we know
(B) The resistance of a conductive wire depends on three factors. In fact, it is given by:
where
L is the length of the wire
A is the cross-sectional area of the wire
Basically, we see that the longer the wire, the larger its resistance; and the larger the section of the wire, the smaller its resistance.