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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 energyradiates uniformly in all directions
A sprinter accelerates from rest to a top speed with anacceleration whose magnitude is 3.60m/s2. After achieving top speed, he runs the remainderof the race without speeding up or slowing down.
A position-time graph for an object moving in the - dir'n and accelerating from a low velocity to a high velocity is shown below. If the object is moving in the - dir'n, then the slope of a p-t graph would be -. If the object is changing velocity fro..
The electric field between the plates of the velocity selector is 4900 V/m, and the magnetic fields in both the velocity selector, compute the radius r of the path for a singly charged ion with mass m = 4.29 10-26 kg
The equation of a transverse wave on a string is y = (6.1 mm) sin[(30 m-1)x + (300 s-1)t], What is the wave speed
When an objectis placed 132cm from diverging thin lens, itsimage is found to be 66 cm from the lens. find Where is the image of the object now
Charge and Charge Density Consider the surface ofa conducting sphere of radius 0.12 m who sepotential is 100 V (with V = 0 atinfinity). What is the total charge?
The block in the figure is initially at rest on an inclined plane at the equilibrium position that it would have if there were no friction between the block and the plane
A 2110-kg test rocket is launched vertically from the launch pad. Its fuel (of negligible mass) provides a thrust force so that its vertical velocity as a function of time is given by v(t)=At+Bt^2, What was the initial thrust due to the fuel
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
The angular momentumof a flywheel having a rotational inertia of 0.150 kgm2 aboutits central axis decreases from 4.00to 1.400 kgm2/s in1.60 s. What is the average power of the flywheel
How does reaction time affect emergency situations, like braking in a car? Estimate the distance a car travels at 100km/hr due to your reaction time in braking
Two narrow slits 3 mm apart are illuminated with light from a sodium lamp (lamda = 589 nm), What is the thickness of this glass
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