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a 0075 kg toy airplane is tied to the ceiling with a string when the airplanes motor is started it moves with a
determine the heat capacity of the calorimeter if you have 25g of water at a temp of 2250 degrees c then add 10 g of
a baseball is thrown from the roof of 235 m-tall building with an initial velocity of magnitude 106 ms and directed at
suppose you were to prepare a buffer solution using ammonia and ammonium chloride what would be the molar ratio of acid
a 125 kg mail bag hangs by a vertical rope 33 m long a postal worker then displaces the bag to a position 22 m sideways
only very pure phosphoric acid is used in food products an older term for soft drinks is phosphates this name was
a box is sliding with a speed of 450 ms on a horizontal surface when at point p it encounters a rough section on the
gas is contained in a 900-l vessel at a temperature of 240degc and a pressure of 600 atma determine the number of moles
a 1000 ml sample of 010 m nh3 is titrated with 010 m hno3 determine the ph of the solution after the addition of 500 ml
a man stands on a frictionless platform that is rotating with an angular speed of 33 rads his arms are outstretched and
extremely small pieces of pet were necessary to ensure a successful hydrolysis in the allotted time a 100ml
on april 13 2029 friday the 13th the asteroid 99942 mi apophis will pass within 18600 mi of the earth-about 113 the
a an ideal gas occupies a volume of 30 cm3 at 20degc and atmospheric pressure determine the number of molecules of gas
calculate the volume of the acid solution needed to completely neutralize the base in the flask 2calculate the ph for
calculate the ph at 25degc of an aqueous solution that is 0320 m in ethylamine and 0140 m in ammonia iethe solution
an elevator has mass 600 kg not including passengers the elevator is designed to ascend at constant speed a vertical
a tennis ball on mars where the acceleration due to gravity is 0379g and air resistence is negligible is hit directly
two violinists one directly behind the other play for a listener directly in front of them both violinists sound
use the equilibrium constants to calculate deltago for the formation of crnh362 cren32 and crdien22 from crh2o62 and
when a carpenter shuts off his circular saw the 100 inch diameter blade slows from 4250 rpm to 000 in 100 sa what is
a bicycle has wheels with a diameter of 0680 m it accelerates uniformly and the rate of rotation of its wheels
d-maltose is a disaccharide and d means the oh on the second to last carbon to the bottom is on the right and l means
susans 100kg baby brother paul sits on a mat susan pulls the mat across the floor using a rope that is angled 30
water flowing through a garden hose of diameter 279 cm fills a 240-l bucket in 130 mina what is the speed of the water
an artificial satellite circling the earth completes each orbit in 141 minutes the radius of the earth is 638 106 m