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question in 1965 sir austin bradford hill proposed guidelines for assessing causality his intention was not for these
radiation from the sun reaching earth just outside the atmosphere has an intensity of 1400 wm2a what would the
when solid ammonium chloride nh4cl is added to excess water a solution forms and the temperature of the system
a sample of 050 g of anhydrous cocl2subscript is dissolved in 250 ml of water predict the absorbance at 510 nm for this
suppose you were to prepare a buffer solution using ammonia and ammonium chloride what would be the molar ratio of acid
the crankshaft in a race car goes from rest to 3100 rpm in 24sa what is the crankshafts angular accelerationb how many
1 an aqueous solution of weak base b of unknown concentration is tritrated with a known concentration of strong acid
a mass attached to a spring vibrates 15 times in 2313 seconds what is the linear frequency in hertz of the
stepwise mehcanism for the reaction of 3-methyl-3-hexanol with hcl to form
the index of refraction for red light in water is 1331 and that for blue light is 1340 a ray of white light enters the
how many grams of nickel would be electroplated by passing a constant current of 72 a through a solution of niso4 for
description on characteristics of pisces
calculate the amount of sulfer dioxide produced annually by a power plant that burns 75 million metric tons t of coal
a person with a mass of 52 kg runs with a speed of 68 ms jumps onto the outer rim of a merry-go-round the
a mixture contains h2 at 325 torr pressure n2 at 475 torr pressure and o2 at 650 torr pressure what is the total
you need a diffraction grating that will disperse the visible spectrum 400nm to 700nm through 350 degrees in the
an alkaline earth metal m combines with a halide x will the resulting compound be ionic or covanlent why what is the
two and one-half kg of ice at temperature t 0ordmc is melted into water at the same temperature by placing it in
three particles have the same electon configuration one is a cation of an alkali metal one is an anion of the halide in
a spaceship of mass 23times106 is cruising at a speed of 56times106 when the antimatter reactor fails blowing the ship
a dry cleaning fluid composed of carbon and chlorine was found to have the composition 145 carbon and 855 chlorine its
in an emergency you need to run a radio that uses 393 w of power when attached to a 160 v power supply the only power
a typical hot pack is designed to reach a temperature of approximately 50 degrees celsius starting from room
if the antacid for analysis is known to be phillips milk of magnesia the solution does not need to be heated but if the
a constant 60 n net force acts for 40 s on a 12 kg object what is the objects change in