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Question:
a) If you install special sound-reflecting windows that reduce the sound intensity level by 32.0 dB, by what factor have you reduced the sound intensity?
b) If, instead, you reduce the intensity by half, what change (in dB) do you make in the sound intensity level?
A thin spherical shell of mass 4.00kg and diameter of 0.200m is filled with Helium(density p= 0.180 kg/ms). It is then released from rest on the bottom of a pool of water that is 4.00m deep.
a golf ball rolls of a cliff with an inital speed of 13.0 m/s. theball falls a vertical distance of 18.8 m into a lake below. Ittakes 1.45 s. What is the speed of the ball just before it hits the water
A mass-spring system has k = 56.4N/m and m = 0.43kg. Find the period of its simple harmonic motion
An object acted on by three forces moves with constant velocity. Find the magnitude of the third force acting on the object
What is the average force felt by a 0.06 kg tennis ball if it strikes the racket at a speed of 30m/s and leaves the racket with a speed of 50m/s in the opposite direction
An excavation crew digs a hole in the ground measuring 60.0 yd X 50.0 yd X 8.00 yd to facilitate a basement for an office building. How many trips must each dump truck make to remove all the material
in an rc series circuit 16.0 v r 1.60 m and c 1.80 microf. a calculate the time constant. s b find the maximum
The density of a 3.0-m long rod can be described by the linear density function ?(x) = 105 g/m + 10.9x g/m2. Determine the center-of-mass coordinate
The pole pieces of one magnet are 45 cm x 45 cm in cross section. Calculate the flux through an area (45 cm x 45 cm) normal to the field direction
An underwater diver sees the sun 58{rm ^circ} above horizontal. How high is the sun above the horizon to a fisherman in the boat above the diver.
an alpha particle the nucleus of a helium atom has a mass of 6.64 multiplied by 10-27 kg and a charge of 2e. what are
two resistors r1 and r2 are in series with a 7.8 volts battery. if r1 has a resistance of 2.0 omega and r2 receives
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