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There is evidence that elephants communicate via infrasound, generating rumbling vocalizations as low as 14 Hz that can travel up to 10 km. The intensity level of these sounds can reach 95 dB, measured a distance of 4.5 m from the source. Determine the intensity level of the infrasound 10 km from the source, assuming the sound energy radiates uniformly in all directions.
A copper telephone wire has essentially no sag between poles 20.5 meters apart on a winter day while the temperature is -15.5° C. How much longer is the wire on the summer day when the temperature is 27.0° C.
A crate is sliding down a ramp that is inclined at the angle of 33° above the horizontal. The coefficient of kinetic friction between the crate and the ramp surface is 0.479. Find the acceleration of the moving crate.
Two atmospheric sound sources A and B emit isotropically at constant power. find the ratio of the larger power to the smaller power
In the figure particles with charges q1 = +5e and q2 = -13e are fixed in place with a separation of d = 21.3 cm, what are the finite positive and negative values of x
You are driving a car with a speed of 25 m/s. You slam on your brakes for 1.50 seconds causing your car to decelerate at a constant rate of 4.50 m/s^2. What is your speed at the end of this time?
A tube of mercury with resistivity 9.84*10^-7 *m has a 23 N/C electric field inside the column of mercury. How much current is flowing, if the diameter of the tube is
A flint glass plate (n = 1.66) rests on the bottom of an aquarium tank. The plate is 11.00 cm thick (vertical dimension) and covered with water (n = 1.33) to a depth of 12.5 cm. Calculate the apparent thickness of the plate
An object with mass 3.5 is attached to a spring with spring stiffness constant 300 and is executing simple harmonic motion. Calculate the maximum velocity attained by the object
A car goes around a curve on a road that is banked at an angle of 35.0^\circ. What is radius of curve
What is the gravitational force of the moon on the earth and What is the gravitational force of the sun on the earth
A satellite circles the earth in an orbit whose radius is 2.78 times the earth's radius. What is the period of the satellite
A flat sheet of crystalline quartz has a thickness of 1.0 cm. It is on top of a flat sheet of diamond that has a thickness of 1.2 cm. how far would it have traveled in a vacuum
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