Solution :
Let us consider the Gaussian surface that is in the form of a cylinder having a radius of r and a length of A which is 
.
The charged enclosed by the cylinder is given by,
(here, V = 
is the volume of the cylinder)
If 
is positive, then the electric field lines moves in the radial outward direction and is normal to Gaussian surface which is distributed uniformly.
Therefore, total flux through Gaussian cylinder is :
Now using Gauss' law, we get
or 
Therefore, the electric field is
Hence, option (d) is correct.
1.12 m/s is the velocity. You can get the velocity of a wave by multiplying the frequency and wavelength together. The product is the velocity.
Mechanical advantage is a force which is measure of a force amplifying effectiveness of a simple machine.so t<span>he number of times a machine multiplies the effort force is mechanical advantage .
hope this helps</span>
Answer:
I think the answer is C.
Explanation:
A primary source is a first hand account of an event while a secondary source is a retelling or second hand account meaning as many details will be prevalent.
We will individually calculate the Kinetic Energy of each of the carts and compare them
<u>Cart A:</u>
m = 1 kg , v = 3 m/s
KE = 1/2 mv²
KE = 9/2 = 4.5 J
<u>Cart B:</u>
m = 3 kg , v = 1m/s
KE = 1/2 mv²
KE = 3/2 = 1.5 J
<u>Cart C:</u>
m = 3 kg , v = 2 m/s
KE = 1/2 mv²
KE = 6 J
<u>Cart D:</u>
m = 4 kg , v = 2 m/s
KE = 1/2 mv²
KE = 2 J
Therefore, Cart C has the most Kinetic energy
