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a u.s $20 gold piece has a mass of 33.44g and displaces 1.935cm^3 of water. if the coin is known to consist of only gold (density=19.3g/cm^3) and copper (density=8.9g/cm^3) what is the percentage of gold composition by mass of the coin?
An L-R-C series circuit is constructed using a 175? resistor, a 12.5?F capacitor, and an 8.00-mH inductor, find the potential difference across the ac source
A proton (m=1.67x10-27 kg) is being accelerated along a straight line at 3.6*10^5 m/sec2 in a machine. If the proton has an initial speed of 2.4x10^7 m/sec.
what is the magnitude of its velocity after the collision. A soccer player applies a force of 60.5 N to a soccer ball while kicking it. If the ball has a mass of 0.42kg, what is the acceleration of the soccer ball.
A cometary nucleus rotates rapidly and has an albedo A=0.05. When its surface temperature reaches T?150K, How far is the cometary nucleus from the Sun
Two positive charges, each of magnitude 1 10-6 C, are located a distance of 14 cm from each other. obtain the magnitude of the force exerted on each charge
a very long, straight solenoid witha cross-sectional area of 6.25cm^2 is would with 44 turns of wire per centimeter, What is the average inducted emf in the secondary coil
A football punter accelerates a football from rest to a speed of 9 m/s during the time in which his toe is in contact with the ball, what average force does the punter exert on the ball
Ships A and B leave port together. For the next two hours, ship A travels at 40.0mph in a direction 20.0 ?west of north while the ship B travels 45.0, What is the speed of ship A as seen by ship B
A nonconducting spherical shell of inner radius R1 and outer radius R2 has a uniform volume charge density ?. find the total charge on the shell
What is the frequency of string that was tightened.How high does it rise above the ground.
A uniform plank of length 5.0 m and weight 211 N rests horizontally on two supports, with d = 1.17 m of the plank hanging over the right support. To what distance, x, could a person who weighs 412 N walk on the overhanging part of the plank before..
The model airplane is flying at a speed of 23 m/s on a horizontal circle of radius 17 m. The mass of the plane is 0.96 kg. The person holding the guideline pulls it in until the radius becomes 8.0 m. The plane speeds up and tension in the guidelin..
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