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A racquetball with a diameter of 5.6 cm and a mass of 42 g is cut in half to make a boat for American pennies made after 1982. The mass and volume of an American penny made after 1982 are 2.5 g and 0.36 cm3. How many pennies can be placed in the racquetball boat without sinking it? (The density of water is 1000 kg/m3.)
A lead ball is dropped into a lake from a diving board 5.6 above the water. After entering the water, it sinks to the bottom with a constant velocity equal to velocity with which it hit the water. The ball reaches the bottom 5 after it is released..
A uniform plank of length 5.0 m and weight 225 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support. To what distance x can a person who weighs 415 N walk on the overhanging part of the plank before it just ..
Two 2.1-cm-diameter electrodes with a 0.10-mm-thick sheet of Teflon between them are attached to a 9.0 V battery, What is the charge before the Teflon is removed
An MP3 player operates with a voltage of 3.7 V, and is using 0.21 W of power. Find the current being supplied by the player's battery
A 1200-turn coil of wire 2.30cm in diameter is in a magnetic field that increases from 0 T to 0.110T in 12.0ms. What is the emf of the coil
A 16-kg rotating disk of radius 0.26m has an angular momentum of 0.30KGg * m^2/s, What is the angular speed of the disk
Iodine molecules dissociates into atoms after absorbing light of 4500 A.If one quantum of radiation is absorbed by each molecule, Find the KE of the iodine atoms
The "hang time" of a punt is measured to be 4.50 s. If the ball was kicked at an angle of 63 degrees above the horizontal and was caught at the same level from which it was kicked, what was its initial speed?
A system has three energy levels. The ground state is nondegenerate; however the first and second excited states, energies e1 and e2, respectively, have degeneracies of 3 and 2, respectively. Find the average energy at temperature T.
A ball bearing is dropped from rest at a point A. At the instant it passes a mark 4.0 m below A, another ball bearing is released from rest from a position 5.0 m below A, How far does the second bearing fall in that time
What is the magnitude of the normal force that each brake pad applies to the rim . find the length of the meterstick as measured in frame S1 according to classical physics. Reply in units of m.
A flat coil enclosing an area of 0.10 m2 is rotating at 65 rev/s, what is the maximum voltage induced in the coil
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