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the pitch of the sound from a race car engine drops the musical interval of a third when it passes the spectators this
a centrifuge in a medical laboratory rotates at an angular speed of 3400 revmin when switched off it rotates through
a large grinding wheel in the shape of a solid cylinder of radius 0330 m is free to rotate on a frictionless vertical
the pendulum in a grandfather clock is made of brass and keeps perfect time at 20 degrees celsius how much time is
when 130 v is applied across a wire that is 75 m long the magnitude of the current density is 16486 am2 find the
stan and ollie are standing next to a train track stan puts his ear to the steel track to hear the train coming he
the longest string a thick metal wire on a particular piano is 30 m long and has a tension of 4000 n it vibrates with a
a man in a tree fort 7 m above the ground he throws a water balloon at a speed of 3ms at a downward angle of 17 degree
why are masses in the chemistry laboratory usually determined by a difference methodusing a beaker to contain the
a sound wave with intensity 23 mwm2 interferes constructively with a sound wave that has an intensity of 16 mwm2 what
two waves with identical frequency but different amplitudes a1 50 cm and a2 30 cm occupy the same region of space are
200 l of 0100m ph 900 glycine buffer starting with the sodium chloride salt of zwitterionic glycine and 100m naoh is
if a solution of kbr mm11901 gmol has a concentration of 25 m and a solution density of 105 gml what is the mass of
at 368100017 khz the reactance in a circuit of a 9 microf capacitor and an inductor are equal in magnitude what is the
a 500-l reaction vessel contains 100 mol n2 300 mol h2 and 0500 mol nh3 will more ammonia nh3 be formed or will it
a cube of ice is taken from the freezer at -95degc and placed in a 105 g aluminum calorimeter filled with 323 g of
during exercise a person may give off 182 kcal of heat in 30 min by evaporation of water from the skin how much water
1 why does a soluble impurity reduce the melting-point range of a pure compound2 why is it advisable to run a mixed
a rainbow viewed from an airplane may form a complete circle where will the shadow of the airplane appear
calculate the maximum number of moles and grams of h2s that can form when 195 g aluminum sulfide reacts with 106 g
an unknown compound b has the melting point 1125-114 degrees c it is suspected that b is either x or a each compound
a solid object is made of two materials one material having density of 2 000 kgm3 and the other having density of 6 000
the tungsten filament of a light bulb has an operating temperature of about 2 100 k if the emitting area of the
many metals react with oxygen gas to form the metal oxide for example calcium reacts in the following manner 2 cas o2g
assuming that the gas is ideal calculate the work required to compress ar gas from 10l to 1l the gas is initially at 25