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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 1200 kg car is traveling at 3.00 m/s and strikes a wall. The 1200 kg car bounces off the wall with a velocity of 4.00 m/s. then the average force on the car is
You find an unlabeled box of fine needles, and want to determine how thick they are. A standard ruler won't do the job, What is the diameter of the needle
Two skiers, one of mass m and the other 2m, start at the top of a mountain. The more daring skier (2m) takes the double black diamond trail to arrive at the bottom more quickly, while the other skier meanders back and forth on a green beginner tra..
During an adiabatic process, the temperature of 6.00 moles of a monatomic ideal gas drops from 565°C to 227°C. Find the change in internal energy
The charge is now taken out from the spherical shell and placed outside it at a distance 25cm from the center of the sphere. Calculate the electric field at the center of the spherical shell
when it falls back it hits the ground with speed v1=50m/s. The mass of the ball is m=20g. Evaluate what is the total work done by the drag force while the ball is in the air?
Find out the friction force on the box
a heat engine expels its waste at 300 C and has a carnot efficency of 25% without changing its intake temprature. What the temprature of the cold reservoir
A solid block of wood is a cube whose volume is 1x10^-3m^3. When dropped into a swimming pool, How much does the block of wood weigh
A steel rod of mass m and length L has the linear expansion coefficient X. It is standing vertically and supports a box of mass M on its top. what is the work done by the rod
The standard kilogram is a platinum-iridium cylinder 39.0 mm in height and 39.0 mm in diametern. what is the density of the material
A plank 2.00 cm thick and 15.7 cm wide is firmly attached to the railing of a ship by clamps so that the rest of the board extends 2.00 m horizontally over the sea below. find the shear modulus of the wood
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