A room has dimension 10cm×15cm ×20com the recerberation time for an empty room is 0.4sec find the average absorption coefficient of the room if the room is provided with curtain clothes of absorption coefficient 0.5what area is covered by the clothes.

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?