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the heat combustion for a sample of coal is 230 kjg what quantity of coal in grams must be burned to heat 5000g of
body a of mass m has an original velocity of 60ms in the x dicrection toward a stationary body b of the same mass after
a sample of calcium metal is contaminated by a certain amount of highly toxic radioactive thorium metal th a 1000-gram
an oven may be regarded as a cube each side 12m long the oven stands on thin legs and the heat transfer through each of
an 660-cm-diameter 370 g sphere is released from rest at the top of a 200-m-long 190 deg incline it rolls without
calculate the mean potential energy and the mean kinetic energy of an electron in the ground state of a hydrogenic
an electron is released from rest at the negative plate of a parallel plate capacitor the charge per unit area on each
a diffraction grating with 700 lines per centimeter is illuminated by a he-ne laser of wavelength 633 nma what is the
derive the equation for the allowed energies of a particle in a one-dimensional box by assuming that the particle is
45 grams of water whose temperature is 30deg celsius are added to a thin glass containing 700 grams of water at 20deg
the membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space
there is force of f 25n i 35n j at r 10m j - 40m ka what is the torqueb what is the angle between the force vector
considor a beaker of water sitting on the pan of an electronic scale giving a reading of 1104g a lead weight hanging
the drain plug on a cars engine has tightened to a torque 25 m n if a 015-m-long wrench is used to change the oil
when a 111 db sound wave comes through an open window of area 0510 m2 how much acoustic energy passes through the
compound y contains only carbon hydrogen and oxygen when a 1000-gram sample of compound y is subjected to combustion
consider a large number of simple pendulums each of length b and massm which possess energies lying between e1 and e2
calculate the ph of an aques buffered solution with a volume of 400ml which contains 358 g of nh4cl ammonium chloride
the intensity of the sound from a certain source is measured at two points along a line from the source the points are
compound x has the following composition 3240 c 816 h 2157 o and 3787 si by mass its molar mass is approximately 300
using a highly sensitive parabolic sound collector amy records the frequency of a tuning fork as it drops into the
a a carnot engine operates between a hot reservoir at 47c and a cold one at -13c if the engine absorbs 500j as heat per
a scuba diver wears a heavy belt to make her average density exactly equal to the density of water her mass including
a student in a parked car honks the horn which has a proper frequency of 290 hz an observer in an approaching vehicle
a supersonic jet passes directly overhead at an altitude of 13265 m traveling at 680 ms or mach 2 how much time elapses