To one end 8 of a light inextensible string of length a is attached a small ring of mass 37 and to the other end b is attached a particle of mass 777. the ring is threaded on a smooth fixed horizontal rod. the system is released from rest when the string ab is taut and along the rod. using the principles of lincar momentum and energy, or otherwise, find the speeds of the ring and the particle when ab is ጊertical when ab is vertical the particle strikes and adheres to another particle of mass 2m which is stationary and free to move. show that when the system comes to instantaneous rest. ab makes an angle arccos (5/6) with the vertical.

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.