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The sound from a church organ "revertebrates" for many seconds after the organ stops producing sound due to reflections inside the church. That is the sound from the organ bounces back and forth off the church walls many times before the sound inentsity decays away completely. If the reverberation time is 10s and the church has the approximate shape of a square box of length 25 m, approximately how many times does the sound reflect back and forth (that is make one round trip through the room, reflecting from both walls) during the revertebration time?
Dave needs to get groceries from the store, which is a distance of D=2.8km east of his house, What is the direction of Dave's displacement for the entire trip
in a science fiction movie a 100 g base ball travelling with a speed of 60m/s and an electron travelling at a speed of 1.2*10^8 m/s are approaching each other for a head on collision, what is the momentum of the base ball
A 0.80 kg ball and a 4.20 kg ball are connected by a 78.0 cm long massless, rigid rod. The structure rotates about its center of mass at 250 rpm. What is the rotational kinetic energy of the structure?
Intensity level prooduced by a jet airplane at a certain location is 150 dB. find the intensity of the sound wave generated by the jet
Musicians can use beats to tune their instruments. One flute is properly tuned and plays the musical note A at exactly 440 Hz. By how much she must shorten her flute to bring it into tune
A cosmic ray travels 60 {\rm km} through the earth's atmosphere in 420 \mu s, as measured by experimenters on the ground
A spring is hanging from the ceiling. Attaching a 560 g mass to the spring causes it to stretch 22.0 cm in order to come to equilibrium. At what position or positions does it have this speed
A copper bar of thermal conductivity 401 W/(m · K) has one end at 104° C and the other end at 33° C. What is the temperature gradient in the bar
An Electronic lift can raise a 216 kg mass a distance of 25.7 m in 5.0 seconds. What was the work done by the lift
a falling rubber ball bounces off the floor. the velocity just before it hits the floor is Vi= (2.7m/2) x + (5.2m/s)y. what is the change in momentum of the ball from just before to just after it is in contact with the floor
In April 2010, the worst oil spill until that time occurred when an explosion and fire on the Deepwater Horizon left 11 workers dead and began releasing oil into the Gulf of Mexico.
When water freezes, it expands about 8.95%. What would be the pressure increase inside your automobile's engine block if the water in it froze
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