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1. A room of ceiling height h, with a rectangular floor of dimensions w and l is measured to have a reverberation time of 0.80s. In this room the walls have effectively no absorption at all and the ceiling and floor have an absorption coefficient of 0.9. If h is doubled, what is the new reverberation time (in s)?
2. You walk into a quiet room with a volume V and, standing near the center, you clap your hands loudly. You carefully listen and you can hear the sound for about 1.3 seconds. Approximately what is the reverberation time for that room (in s)?
3. You enter an empty room of volume V which has been characterized as having a total of 600 Sabins and a reverberation time 20s. If now a crowd of 200 adults enters the room adding 4.5 Sabins each, what would be the new reverberation time (in seconds)?
An object made of a single atomic element weighs 2.4500 N in air and 2.1387 N when completely submerged in water. Calculate the density of the object
But how could dark photons be distinguished from a violation of mass-energy conservation? Is it possible? If not, does that mean mass-energy conservation prohibits the existence of such particles.
Halley's comet, which passes around the Sun every 76 years, hasan elliptical orbit. When closest to the Sun (perihelion) it is ata distance of 8.823 x 1010 m, Calculate its speed at aphelion
Two objects with masses of 3.90 kg and 6.20 kg are connected by a light string that passes over a frictionless pulley, as in the figure below. (The figure shows a pulley with the two objects on opposite sides hanging vertically) (a) Determine the ..
A hand grenade of total mass 6 kilogram explodes into three pieces each of 2 kilogram. Determine what speed does the third piece have
It takes 180J of work to compress a certain spring 0.15m. What is the force constant of the spring
What are the three longest wavelengths for standing waves on a 240 cm long string that is fixed at both ends?
A point charge causes an electric flux of (-300)N*m2/C to pass through a spherical Gaussian surface of11.0 cm radius centered on the charge. how much flux would pass through the surface
A 2.20 H coil with a resistance of 2.18×10^2 ohms is in series with a 1.29×10^3 ohms resistor. What is the peak value of the potential difference across the coil
A crate is sliding down a ramp that is inclined at an angle of38 degrees above the horizontal. Find the acceleration of the moving crate
A horizontal force of 150 N is used to push a 45.0 kg packing crate a distance of 5.10 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. (a) the work done by the 150 N force _________J (b) the coeffici..
a water molecule consists of an oxygen atom with two hydrogen atoms bound to it . the angle between the two bonds is
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