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A ten-year exposure to the sound of a riveting machine will cause your threshhold of hearing to shift from 0 dB to 30 dB. What is the sound intensity corresponding to 30 dB? The normal lowest detectable intensity is 1.0 X 10 -12 W/m squared.
You are walking around your neighborhood and you see a child on top of a roof of a building kick a soccer ball. How tall is the building that the child is standing on
Two charged plates create a potential difference of 190 V. At a point halfway between the plates an electron is released from rest. What was the initial speed and direction of the proton
A point charge +2.40 is held stationary at the origin. A second point charge -4.30 moves from the point = 0.135 , = 0 , to the point = 0.270 , = 0.270. How much work is done by the electric force on q2
A 40 N crate starting at rest slides down a rough 6m long ramp inclined at 30 degrees with the horizontal. find the velocity of the crate at he bottom of the incline
A 20.5 Newton weight is held in the outstretched hand of a person with a shoulder-to-elbow length of 25.0 centimeter and an elbow-to-wrist length of 20.5 centimeter. Find the magnitude of torque about the shoulder produced by the weight
Unpolarized light with an intensity of 980 W / m2 is incident on a polarizer with an unknown axis. What is the angle between the axes of the polarizers
You have 18 speakers in the with a large room where there are many audiences , what is the best way to arrange the speakers to get the best less frequency ?
A 100 cm long, 1.2 mm diameter steel guitar string must be tightened to a tension of 1700 N by turning the tuning screws. By how much is the string stretched
A rope is wrapped around a wheel of diameter 50 cm. The wheel is mounted. With friction less bearings on an axle during its center. Find the linear acceleration of the falling block
What is the surface temperature of Betelgeuse, a red giant star in the constellation of Orion, which radiates with a peak wavelength of about 970 nm
Astronauts discover a planet orbiting another star. The mass of the star is 8.10 x 10^30 kg, what is the force exerted by the star on the planet
a cylinder-shaped carbon resistor is 8 em in length and its circular cross section has a diameter d 1 mm. a determine
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