A solid metal sphere of radius r is inside a metal concentric spherical shell of inner radius 2r and outer radius 3r. A charge is place on the
solid metal sphere and it is found that the potential at its surface is V1 (at r) and that the potential at the outer surface of the spherical
shell is Va (at 3r). In terms of V1 and V3, what is the potential at the inner surface of the metal shell (at 2r)?
A. 3V1/2 B. V3 C. V1 D. 2V3/2

Aroller coaster car moving at a velocity of 30 meters/second has a momentum of 2.5 x 10^4 kilogram meters/second. what is its mass?

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.

In this thread, i would like you to comment on the nature of light and how operation of telescopes. light has a duality of a particle and a wave; which one affects your life? also how does light interact with optics inside telescopic systems? answer these questions in two paragraphs. then respond the another students response.