Sound follow up A drumhead is vibrating at a frequency of 500 Hz. If it makes 1500 vibrations at a temperature of 100C, how far does the sound travel?

Suppose that an electromagnetic wave which is linearly polarized along the x−axis is propagating in vacuum along the z−axis. the wave is incident on a conductor which is placed at z > 0 region of the space. the conductor has conductivity σ, magnetic permeability µ and electric permittivity ε. (a) find the characteristic time for the free charge density which dissipates at the conductor. (b) write the maxwell equations and derive the wave equation for a plane wave propagating in a conductor. (c) find the attenuation distance at which the incident amplitude reduces to e ^−1 of its initial value. (d) find the electric and magnetic fields inside the conductor. 8 (e) find the power loss per area of the incident electromagnetic wave at the surface of conductor.

What are the three ways that an object can accelerate

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c