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At a rock concert, a meter reads 130 dB when located 2.80 meter in front of a loudspeaker. Find what was the sound power output of the speaker assuming uniform, isotropic sound propagation?
a carnot efficiency engine operating between a reservoir of liquid mercury at its melting point and a colder reservoir extracts 15.0 J of heat from the mercury, What is the temperature of the colder reservoir
question1two rectangular optically flat glass plates of index of refraction 1.46 are in contact along one end and are
A series RCL circuit has a resonant frequency of 2200 Hz. When operating at a frequency other than 2200 Hz, the circuit has acapacitive reactance of 5.50 Ohms and an inductive reactanceof 35.0 Ohms.
A truck covers 40.0 meter in 7.05 second while smoothly slowing down to a final velocity of 2.95 m/s. Determine the truck original speed
The membrane that surrounds a certain type of living cell has a surface area of 4.5 x 10-9 m2 and a thickness of 1.1 x 10-8 m, how many such ions are present on the outer surface
Suppose the end of your finger is charged, Estimate the breakdown voltage in the air for your finger
Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of -0.7692 N when separated by 50 cm, center-to-center, What were the initial charges on the spheres
You hit a 142 g baseball by swinging a bat with a force of 500 N. The collision lasts for 25.0 ms. If the ball was initially thrown at 19 m/s, What is the final speed of the ball
The aurora is caused when electrons and protons, moving in earth's magnetic field of 5x10^-5 T, collide with molecules of the atmosphere and cause them to glow. What is the radius of the circular orbit for (a) an electron with speed 1.0×10^6 and (b) ..
A sled is initially given a shove up a frictionless 25 degree incline. It reaches a maximum vertical height 1.35 m higher than where it started. What was its initial speed
The raising and lowering angular momentum operators, J-hat(subscript +), J-hat(subscript -) are defined in terms of the Cartesian components J-hat(subscript x), J-hat(subscript y), J-hat(subscript z) of angular momentum J-hat by J-hat(+)=J-hat(x)+..
A steel beam 10m long is installed in a structure at 15?C, What is the beam's change in length when the temperature reaches 50?C
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