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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)?
A positive point charge Q1 = 2.8×10?5C is fixed at the origin of coordinates, and a negative charge Q2 = ?5.5×10?6C is fixed to the xaxis at x=+1.5m. Find the location of the place(s) along the x axis
A solid cylinder of radius 0 cm and mass 9 kg starts from rest and rolls without slipping down a 32° incline that is 9 m long. What is its translational speed when it reaches the bottom? What is its rotational speed when it reaches the bottom?
Ignoring the heat lost along the length of the poker, find out the amount of heat conducted from one end of the poker to the other in 3.0 s.
a 87.40 kg hiker has ascended to a height of 1867 m in the process of climbing mt. washington. by what percent has the hikers weight changed
A 19.6cm diameter coil consists of 40 turns of circular copper wire 1.7mm in diameter. estimate the current in the loop
A 16.5 kg gold bar at 26.0°C is placed in a large, insulated 0.800 kg glass container at 15.0°C with 2.00 kg of water at 25.0°C. Calculate the final equilibrium temperature
A vertical electric field of magnitude 2.45 x 104 N/C exists above the Earth's surface on a day when a thunderstorm is brewing. Determine the electric flux through the bottom of the car
Global positioning satellites (GPS) can be used to determine positions with great accuracy. How many significant figures are needed in the distance
An LC circuit like the one in Figure CQ32.8 contains an 82.0 mH inductor and a 17.0 micro Farad capacitor that initially carries a 180 micro Coulomb charge. The switch is open for t
A water molecule, which is electrically neutral but has a dipole moment of magnitude p = 6.20·10-30 C m, Calculate the magnitude of the net force
A 5.0mL syringe has an inner diameter of 4.5mm , a needle inner diameter of 0.29mm, What is the minimum force the nurse needs to apply to the syringe
Bailey is trying to save a young girl under a 15 m long wooden beam. She lifts the beam up from one side with a force of 25 N using her nose. find the magnitude of the torque that Bailey puts on the beam
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