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sound with a frequency 730 hz from a distant source passes through a doorway 105 m wide in a sound-absorbing walla find
fluoridation is the process of adding fluorine compounds to drinking water to help fight tooth decay a concentration of
a solution is prepared by dissolving 02222 g of kio3 in 50ml find the molarity and its uncertainty with an approximate
a 250 kg propeller may be considered a 45m long rod spun about its center what final angular velocity does the
assuming that a neutron star has the same density as a neutron calculate the mass in of a small piece of a neutron
find the mass of urea needed to prepare 507 of a solution in water in which the mole fraction of urea is
a hollow cylindrical tube of 25 m long is open at one end and closed at the other end what is the linear distance
two sound sources produce sound waves the first source has an intensity level of 380 wm2 and the second source has an
a 265-g copper coin at 215degc drops 600 m to the ground assume the specific heat of copper is 387 jkg middot degca
if 1000 ml of 020 m cacl2 is mixed with 2000 ml of 050 m nacl soultion calculate the final concentration of cl- of the
a sphere of radius r1245cm and mass m120kg starts from rest and rolls without slipping down a 30 degree incline that is
a nuclear power plant has a maximum steam temperature of 280degrees c it produces 790mw of electric power in the
at high altitudes water boils at a temperature lower than 1000deg c due to the lower air pressure a rule of thumb
when a 584 nm radiation is directed on a sample of krypton electrons are ejected with a velocity of 159x106 ms what is
an electron traveling 107 ms to the right enters a constant electric field that slows it to rest awhat is the potential
a major league pitcher of mass 100kg is standing on a skateboard of mass 200kg holding a baseball the skateboard is
when a particular inductor is connected to a sinusoidal voltage with a 245 v amplitude a peak current of 79 a appears
a 512-turn circular-loop coil with a diam- eter of 174 cm is initially aligned so that its plane is perpendicular to
how many moles of benzoic acid did you use in this reaction how many moles of methanol did you use why was this
a sprinter of mass 714 kg runs at a constant speed of 111 ms in a straight line find the extra force the sprinter must
the r factor for housing insulation gives the thermal resistance in units of ft2 degf hbtu a good wall for harsh
a small package rests on the horizontal dashboard of a car if s 0340 what is the minimum acceleration of the car that
you are holding a bulletin board weighing 868 n in place against a wall while your friend secures it to the wall to
an unknown chromium solution was mixed with aliquots of a standard solution of chromium for atomic absorption