Answer:
644 W/m²
0 W/m²
Explanation:
= Initial intensity of light = 1288 W/m²
= Angle of filter
Intensity of light is given by
The intensity of the transmitted light is 644 W/m²
The intensity of the transmitted light is 0 W/m²
Explanation:
Below is an attachment containing the solution
Answer:
Explanation:
To calculate the force we need to use this equation
where L is the total length of the wire
So in this case the small element of current is
Because x is the direction of the current flow.
As is said in the problem B is such that
so to use the equation above we first calculate the following cross product:
so the force:
So here we use the fact that B=0 in any point of the x axis that is not , that means that we only need to do the integration between a very short distant behind the point and a very short distant after that point, meaning:
so is the same as evaluating at
that is:
Answer:
d) KEe = KEp
Explanation:
According to the law of conservation of energy, the electric potential energy is converted into the kinetic energy of the particle:
Here, q is the particle's charge and V is the potential difference.
The charge of the electron is -e. So:
The charge of the proton is e. So:
So
Ah hah ! We can do this the easy way, or we can do it the hard way.
Whereas, in honor of, and pursuant to my natural laziness, I'm going to
do it the easy way, and not even talk about the hard way. Please fasten
your seat belt. It may be a boompy ride.
There are a few different ways to calculate the CHANGE in
an object's momentum. For this particular problem, it's
best to use this equation for "Change in momentum":
CHANGE in momentum = IMPULSE delivered to the object.
Do you remember how to calculate impulse ?
Impulse = (force exerted in the object) x (time the force lasts)
-- In the question, it says that the same force is exerted on each car,
and they all get it for 10 seconds apiece.
-- Since the force is the same on each car, and the force lasts for
the same amount of time on each car, the IMPULSE delivered to
each car is the same !
-- So the CHANGE IN MOMENTUM is the same for each car.
-- They all started out from 'rest', so each one started with zero momentum.
-- The CHANGE IN MOMENTUM is the same for each car.
-- So at the end of 10 seconds, NO CAR has the 'most momentum'.
All three cars have the SAME momentum.
Do you see why I said that this is the 'easy way' to solve it ?