Answer:
option D
Explanation:
The correct choice of Gaussian surface would be (D) a finite closed cylinder whose axis coincides with the axis of the rod and whose cross-section has a radius of . This is because the charged cylinder is of <em>infinite length</em> and hence there won't be any electric flux coming out of the top and bottom flat surfaces.
Now, to find out the magnitude of the electric field , we shall have to apply Gauss's law,
or, ( being the height of the Gaussian cylinder)
or,
Answer:
8 meter telescope 16 times more gather light than 2 meter telescope.
Explanation:
The amount of light gather by the telescope is known as Light Gathering Power (LGP).
Light Gathering Power is determine by the relation:
In this problem, let l₁ and l₂ be the length of two telescopes and (LGP)₁ and (LGP)₂ be the light gathering power of two telescopes respectively. Then the ratio of their LGP is :
Substitute 8 m for l₁ and 2 m for l₂ in the above equation.
Answer:
KE (5) = 1/2 M V^2 = 25/2 M
KE (10) = 1/2 M V^2 = 100/2 M
KE (10) - KE (5) = M/2 (100 - 25) = 75/2 / M
An object traveling at 10 m/s has 4 times the kinetic energy as an object traveling at 5 m/s
Total work would depend on the mass being accelerated