Answer:
W=0.94J
Explanation:
Electrostatic potential energy is the energy that results from the position of a charge in an electric field. Therefore, the work done to move a charge from point 1 to point 2 will be the change in electrostatic potential energy between point 1 and point 2.
This energy is given by:
So, the work done to move the chargue is:
The work is positive since the potential energy in 1 is greater than 2.
White light is all the colours of light combined. When the droplets act like prisms, they split the white light into all its colours and also slightly bend the different colours. This is how a rainbow is formed.
Answer:
50Kgm/s
Explanation:
Momentum=Mass*Velocity
P=mv
Given Mass=5Kg. Given Velocity=10m/s
Momentum=5*10=50Kgm/s
Three
The ray of light will come out of the glass at 90 degrees to the normal. What goes in is called the critical angle. At 90 degrees the ray will reflect rather than refract. This is just for interest.
<em><u>Formula</u></em>
n2 * sin(θ2) = n1* sin(θ1)
<em><u>Givens</u></em>
θ2 = 90 degrees
n2 = 1
n1 = ?
θ1 = 43.6
<em><u>Solution</u></em>
n1 * sin(43.6) = 1 * 1
n1 = 1/sin(43.6)
n1 = 1/0.6896
n1 = 1.45
Four
This problem is very instructive. It uses a little known trick so that you don't have to know the exact speed of light of one of the speeds. The other speed is compared to it. You could do it the long way and figure out the speeds in crown glass from air to the crown glass, and do the same thing with the other color. That would work. An easier way is not to bother. Call the speed of one of the colors = 1. Is the other speed greater or less than 1? We'll see.
The next thing you have to realize is that the speed is going to be highest for either red or violet. That's because n is highest for violet and lowest for red. The intermediate colors don't matter. So the answer is either A or B.
They have n's between violet and red and so they will not be an answer. That means you can eliminate green and yellow (answers C and D).
<em><u>Formula</u></em>
v1/v2 = n2/n1
<em><u>Givens</u></em>
v1 = 1 (we'll say this is red)
v2 = ? (this is violet)
n2 = 1.62 for red. This is probably not exact, but it does not have to be. You just have to notice that violet is higher
n1 = 1.65 for violet. So you are trying to solve the relative speed of v2.
<em><u>Solution</u></em>
v1/v2 = n2/n1
1/v2 = 1.65/1.62 Cross multiply
1.65 * v2 = 1 * 1.62 Divide by 1.65
v2 = 1.62/1.65
v2 = 0.98
<em><u>Conclusion</u></em>.
The speed of violet is going to be slower than the speed of red.
Rule: the higher the index of refraction, the lower the speed.
Answer: red has the greater speed.
Calculate velocity at halfway to the ground.
vfinal = root 2ad
v = root (2*9.81m/s^2*25)
v = 69.367175234 m/s
Kinetic energy = 1/2mv^2
Kinetic energy = 1/2 * (69.367175234 m/s^s^2
Ek = 2405.9025 Joules
