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A typical adult ear has a surface area of 1.45 × 10-3 m2. The sound intensity during a normal conversation is about 2.49 × 10-6 W/m2 at the listener's ear. Assume that the sound strikes the surface of the ear perpendicularly. How much power is intercepted by the ear?
A 120 V potential difference is applied to a space heater that dissipates 516 W during operation. At what rate do electrons flow through any cross section of the heater element
A car drives straight off the edge of a cliff that is 58 m high. The police at scene of the accident observed that the point of impact is 121m from the base of cliff. How fast was the car traveling when it went over the cliff.
A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 210 mi/h in 3.00 s. (a) Find the average acceleration of the plane. m/s2 (b) Assuming the acceleration is constant, find the distance the plan..
A mass of 1 kg is hung vertically from a spring stretching the spring .20 m. It is then pulled .10 m below its equilibrium position, find the time to make one complete cycle
What is an approximate absorbed dose rate in Gy per day in water at the center of the bucket if 163 atoms of Cs-137 disintegrate per g s? Use the straight-ahead approximation and mean-radius method of calculating the photon dose. Give the answers for..
A gas with ?=75 is at 285K when it's compressed isothermally to one-third of its original volume and then further compressed adiabatically to one-fifth of its original volume
Water flows at 5.0;{rm L}/{rm s} through a horizontal pipe that narrows smoothly from 10 cm diameter to 5.0 cm diameter. A pressure gauge in the narrow section reads 50 kPa. What does the other pressure gauge read.
If a metric ton is 1 x10^3 kg, how many 88 kg people can safely occupy an elevator that can hold a maximum mass of exactly 1 metric ton.
A 4 kg block is acted upon by three horizontal forces. 10n (to left) 5n(short arrow to right) 25n to right. what is the horizontal acceleration of the block
Suppose a hockey puck slides down a frictionless ramp with an acceleration of 5.90 m/s2, What angle does the ramp make with respect to the horizontal
One runner ran the 100-m dash in 11.9 s. Another runner came in secona at 12.4 s. determine the sepaaration between the two runners
The two forces in each pair could have different physical origins (for instance, one of the forces could be due to gravity, and its pair force might be due to friction or electric charge).
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