Physics Answers

At exactly 2 hr :00min a pendulum Bob is thrown vertically upward from the ground with an initial velocity of 75m/s,at what time will the Bob return to the ground

Determine the magnitude and direction of the electromagnetic force between the two charges 66 and -22 separated by the distance 45.

 Three charges line vertically respectively61, -32, -8. 61 and -32 is separated by 50 while -32 and -8 is separated by71. What is magnitude and direction of the total net  force experience by -8?

You have an equilateral triangle, and it happens you place three charges 45, -35, and 77 on each vertex, the equilateral triangle is separated by the distance 61. What is the total net force experience by -35 due to other two charges if the charge is place at the middle vertex of the triangle?

For an optical resonator, what is the physical significance of the equation, n(ν)dν = 8π(ν³/c³) dν?

In color center laser, what are the active medium, host material, and laser wavelength? Illustrate the factor, on which laser wavelength depends?

What is the physical significance (importance) of free spectral range (δνr) of the resonator in real laser systems?

The potential energy of a system of two atoms is given by the expression:

𝑈 = − 𝐴 𝑟

2 ⁄ + 𝐵 𝑟

10 ⁄

A stable molecule is formed with release of 8.0 eV of energy when the interatomic distance is 

2.8 Å. 

i. Calculate A and B