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A 9kg object is suspended from the ceiling by a strong spring, which then undergoes simple harmonic motion with a period of 0.4s. The block is brought to rest, and the equilibrium length of the spring with the block attached is measured. By how much this length reduced when the block is removed?
suppose a high voltage dc generator produces a potential difference of 75. kv across an air gap distance of 1.25 cm.
A ship's mast reaches to a height of 15 meters above the surface of a 10-meter-deep lake. When the sun is 30° above the horizon, how long will the shadow of the mast be on the bottom of the lake?
A beam of protons traveling at 1.70 km/s enters a uniform magnetic field, traveling perpendicular to the field. Evaluate the magnitude of the magnetic field
a steel ball is dropped from a buildings roof and passes a window taking 0.115 s to fall from the top to the bottom of
A neutral (uncharged) capacitor has a charge of -3.00C moved from one of the plates to the other in a time of 5.00 sec, leaving +3.00C on the 1st plate. The +charges don't move, only the electrons. What was the average current?
One force acting on a machine part is F = ( - 5.00 N) i hat+ (4.00 N) j hat. The vector from the origin to the point where the force is applied is r = (- 0.450m) i hat + (0.150m) j hat , Calculate the torque produced by this force
An explosion breaks an object into two pieces, one of which has 1.5 times the mass of the other. how much kinetic energy did each piece acquire
A factory worker pushes horizontally to the right on a 250 N crate with a force of P = 75.0 N on a horizontal rough floor. A 135 N crate rests on top of the one being pushed and moves along with it. Call the bottom crate {rm A} and the top crate {..
A reflecting telescope has a main mirror with fM = 570 mm. If an eyepiece with a magnification of 45 is used, what is the total magnification of the telescope
What is the minimum energy needed to create a electron-positronpair when the photon collides with an electron? I know what to do when it collides with a nucleus, I can not figureout what to do about an electron.
An inductor of L=0.7H and a charged capacitor C=5F with Q =20C are connected to each other. How much energy is stored in the capacitor initially? When the current in the circuit is ½ its maximum value, how much energy remains in the capacitor?
A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. How many revolutions per minute is the sample making
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