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Assume you are helping some friends, working the stage at a rock concert wearing earplugs that provide a reduction of 16 dB. Determine what is the ratio of the sound intensity just outside the plugs to the intensity reaching your eardrums?
a silvered sphere is used as a christmas tree ornament has a diameter of 0.08 m. a girl holds the ornament 0.2m from
An AC generator consists of 8 turns of wire in a loop or coil, the cross-sectional area of the loop is A=0.09 m2, with a total resistance of 12Ω. The loop is rotating in a magnetic field B=0.5T at a constant rate of 60Hz.
one horsepower (1 hp) is the unit of power based on the work that a horse can do in one second. This is defined, in Englishunits, as a force of 550 Ib that can move an object 1ft in 1 s. InSI, 1 hp equals 745.7 W.
Define Eddy viscosity and Von Karman constant using the mixing-length theory.
A proton ,a deutron and an alfa particle ,accelerated through the same potential difference ,enter a region of uniform magnetic field moving at right angles to B.(a) compare their kinetic energies .(b) if the radius of the proton’s circular path is 1..
The elastic energy stored in your tendons can contribute up to 35% of your energy needs when running. Sports scientists have studied the change in length of the knee extensor tendon in sprinters and nonathletes. They find (on average) that the sprint..
A rectangle measuring 30.0 {rm cm} by 40.0 {rm cm} is located inside a region of a spatially uniform magnetic field of 1.30 T, with the field perpendicular to the plane of the coil. The coil is pulled out at a steady rate of 2.00 {rm{ cm/s}} travelli..
A child playing tee ball hits a stationary 65 {\rm g} ball with a 300 {\rm g} bat swinging initially at 4.0 {\rm m/s}. What's the bat's post-impact speed
A centrifuge in a medical laboratory rotates at an angular speed of 3650 rev/min. When switched off, itrotates through 48.0 revolutionsbefore coming to rest. Find the constant angular acceleration of the centrifuge.
During a lunar eclipse, a picture of the moon (which has a diameter of 3.48×106 m and is 3.86×108m from the earth) is taken with a camera whose lens has a focal length of 305mm, What is the diameter of the image on the film
An engine absorbs 1.72 kJ from a hot reservoir at 277°C and expels 1.15 kJ to a cold reservoir at 27°C in each cycle. How much work is done by the engine in each cycle
two charges are placed on the x axis a 6.00 microc charge at x 80.0 cm and a -3.00 microc charge at x 0. find e
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