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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 97 dB, measured a distance of 4.0 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.
dB
Find the radius R of the star Rigel, the bright blue star in the constellation Orion, which radiates energy at a rate of 2.7×1032 W
A horizontal 790-N merry-go-round of radius 1.60 m is started from rest by a constant horizontal force of 55 N applied tangentially to the merry-go-round
Point P is at a potential of 500.0 kV and point S is at a potential of 200.0 kV. by how much does its kinetic energy change
Starting from rest, a 10.00 kg piece of luggage slides 6.00 m down a rough 30. degree incline. Calculate the force of friction acting on the suitcase on the incline plane
q1. some studies indicate that the upper frequency limit of hearing is determined by the diameter of the eardrum. the
You have available lenses of focal lengths 2.0 cm, 4.0 cm, 8.0 cm, and 16.0 cm. what is the maximum magnification you could achieve
a 55 kg swimmer is standing on a stationary 175 kg floating raft. the swimmer then runs off the raft horizontally with a velocity of + 3.7 m/s realtive to the shore. Find the recoil velocity that the raft would have
A solid sphere of mass m and radius r spins about a horizontal axis with a period T. Find the size of the torque acting on the sphere
An egg with a mass of 40 grams is on a table of 1 meter high, it falls and breaks. what was the force exerted by the floor on the egg so that it broke
An AC generator supplies an rms voltage of 115 V at 60.0 Hz. It is connected in series with a 0.350 H inductor, a 3.10 ?F capacitor and a 256 ? resistor. What is the peak voltage across the inductor
A 240-V dc motor has an armature whose resistance is 1.10? . When running at its operating speed, it draws a current of 16.0A, What is the back emf of the motor when it is operating normally
You are traveling on an airplane. The velocity of the plane with respect to the air is 190.0 m/s due east. How far east will the plane travel in 1 hour
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