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A radio station broadcasts with a power of 50,000 watts. Estimate the average intensity of the wave at a distance of 50 km from the radio transmitting antenna. Assume for the purpose of this estimate that the antenna radiates equally in all directions, so that the intensity is constant over a hemisphere centered on the antenna.
Is the collision completely elastic
A hot ( ) lump of metal has a mass of 250g and a specific heat of 0.25 . John drops the metal into a 500g calorimeter containing 75g of water at . The calorimeter is constructed of a material that has a specific heat of 0.10 . When equilibrium is ..
Explorer is caught in a whiteout (in which snowfall is so thick that the ground cannot be distinguished from the sky) as returning to base camp.
A certain part of an aircraft engine has a volume of 2.6 ft3. Determine how much weight is saved by using aluminum instead of nickel
The skis have a thrust of 200. Sam's speed at the bottom is 43.0. Illustrate what is the coefficient of kinetic friction of his skis on snow?
An electron moves at a speed of 15000 m/s in a circular path of radius 2.2 cm. Find the strength of the magnetic field inside the solieod
A curve of radius 35 m is banked for a design speed of 64 km/h. If the coefficient of static friction is 0.34 (wet pavement), at what range of speeds can a car safely make curve.
A 3.00-kg block starts from rest at the top of a 35.5° incline and slides 2.00 m down the incline in 1.50 s, Find the frictional force acting on the block
A spring of k=12.00 N/m has a block of mass 11- kg attached to it on a frictionless table. If the block is pulled a distance 0.17m to the right and released from rest, how long would it take the block to return to its equilibrium position? Give yo..
A wheel has eight spokes and a radius of 33.0 . It is mounted on a fixed axle and is spinning at 2.80 . You want to shoot a 38.0 long arrow through the wheel, parallel to this axle, without hitting any of the spokes. Assume that the arrow and the ..
The Pulse frequency of a person is 90 beats/min, Find the power of heart if the density of mercury is 13.6 X 10^3 kg/m^3 (g=10 m/s^2)
A bullet is shot vertically up with v0 from ground level. The definition of vertical is by a plumb bob, find the location where the bullet returns to the ground
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