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There is evidence that elephants communicate via infrasound,generating rumbling vocalizations as low as 14 hz that can travelup to 10 km. The intensity level of these sounds can reach98 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 0.57 kg object connected to alight spring with a force constant of 24.8 N/m oscillates on a frictionless horizontal surface. Determine the maximum speed of the object
A solid, uniform disk of radius 0.250 m and mass 61.6 kg rolls down a ramp of length 4.60 m that makes an angle of 16° with the horizontal. Find the speed of the disk's center of mass when it reaches the bottom of the ramp
It takes sound waves of frequency 500 Hz 14.7 ms to make a round trip through a hollow pipe of length 7.5 m filled with helium. What is the speed of sound in helium
A 61 kg boy and a 42 kg girl use an elastic rope while engagedin a tug-a-war on a frictionless icy surface. If theacceleration of the girl toward the boy is 2.7 m/s2, determine the magnitude of the acceleration of the boy toward thegirl
At one time, television sets used "rabbit-ears" antennas. Such an antenna consists of a pair of metal rods. How long is each rod
A fuel pump sends gasoline from a car's fuel tank to the engine at a rate of 0.0574 kg/s. The density of the gasoline is 735 kg/m3, and the radius of the fuel line is 0.00322 m. What is the speed at which the gasoline moves through the fuel line?
The telescope at Yerkes Observatory in Wisconsin has an objective whose focal length is 19.4 m. Its eyepiece has a focal length of10.0 cm. What is the angular magnification of the telescope
The pulley system in Figure below is used to lift a 52-kg crate. Note that a chain connects the upper pulley to the ceiling, determine the tension in each chain
A person decides to use an old pair of eyeglasses to make someoptical instruments. What is the maximum angular magnification he can produce
a proton of atomic mass 1u with a speed of 750 m/s collides elastically with another proton at rest. What is the final speed of the target proton after the collision
A cylinder with a piston holds 0.80 m3 of oxygen at an absolute pressure of 8.0 atm. what new volume does the gas occupy
a football spends a total of 5 seconds in the air.it reaches a peak height of 20 meters. how long does it takes to reach its peak height
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