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A U.S. $20 gold piece has a mass of 33.44 grams and displaces 1.935 cm^3 of water. If the coin is known to consist of only gold (Pau = 19.3 g/cm^3) and copper ( Pcu = 8.9 g/cm^3), what is the percentage gold composition of the coin?
An electric motor rotating a workshop grinding wheel at a rate of 9.70 101 rev/min is switched off. How long does it take for the grinding wheel to stop
a very thin sheet of brass contains two thin parallel slits. when a laser beam shines on these slits at normal
Two charged spheres are 8.45cm apart. They are moved, and the force on each of them is found to have been tripled. How far apart are they now.
A large disk of mass Md and radius R is spinning in a horizontal plane about a vertical axis through its center with a given angular velocity of omega. Find the final angular velocity of the disk
A 1.02 liter flask contains a certain quantity of ideal gas at 315 K. Then an equal number of molecules of the same gas are added to the flask, after which the absolute pressure is 1.60 times its original value. What is a final temperature.
In a series R-L-C circuit, L=.165H C=85.0uF and the voltage amplitude of the source is 200V. What is the resonace angular frequency of the circuit
A string with a mass m = 5.00 g and a length L = 9.00 m has one end attached to a wall; the other end is draped over a small, what is the fundamental frequency of its vibration
a 900-kg car is moving at 33.3 ms. a braking force of -7548 n is applied for 2.70 s. what is the velocity of the car
a moving particle encounters an external electric field that decreases its kinetic energy from 9910 ev to 6840 ev as
A solid, horizontal cylinder of mass 7.1 kg and radius 0.57 m rotates with an angular speed of 5.84 rad/s about a fixed vertical axis through its center. What is the final angular speed of the system
a target in a shooting range gallery of a square wooden board of side length s 0.500 meter and mass mt 0.750 kg that
which is basically a diskshaped grindstone of mass 1.2 kg and radius 7.30 cm which operates at 700 rev/min. When the power is shut off, you time the grindstone and find out it takes 39.0 s for it to stop rotating.
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