If the sign for delta G is negative (spontaneous process) and sign for delta S is positive (more disorder) for both dissolving processes, how could one be endothermic (positive delta H- NaNO3 dissolves in water) and one be exothermic (negative delta H- NaCH3COO dissolves in ...
July 30, 2014
Light shines through a single slit whose width is 5.7 × 10-4 m. A diffraction pattern is formed on a flat screen located 4.0 m away. The distance between the middle of the central bright fringe and the first dark fringe is 3.9 mm. What is the wavelength of the light?
March 31, 2014
Two pianos each sound the same note simultaneously, but they are both out of tune. On a day when the speed of sound is 348 m/s, piano A produces a wavelength of 0.766 m, while piano B produces a wavelength of 0.780 m. How much time separates successive beats?
February 10, 2014
Venus is a grade 12 learner and she claims that she can shoot a stone 50m vertically high by using a catapult.She wants to know the relationship between the height reached by the stone and the initial velocity of it.
April 10, 2013
The area enclosed between the x-axis, the curve y=x(2-x) and the ordinates x=1 and x=2 is rotated through 2π radians about x-axis. (a)Calculate the volume of the solid revolution formed. (b)Calculate the rotating area. from this question what about he grap need to draw or...
May 27, 2012
The area enclosed between the x-axis, the curve y=x(2-x) and the ordinates x=1 and x=2 is rotated through 2π radians about x-axis. ( a)Calculate the volume of the solid revolution formed. (b)Calculate the rotating area.
May 27, 2012
A rectangular play yard is to be constructed along the side of a house by erecting a fence on three sides, using house wall as the fourth wall. Find the demensions that produce the play yard of maximum area if 20 meters of fence is available for the project.
September 19, 2011
serotonin is formed by 2 steps. first is the decarboxylation of tryptophan to form tyrptamine,second is the hydroxylation of typtamine to form 5-hydroxytyrptamine which is serotonin. can you help me illustrate these reactions? This reference has a figure showing one of the ...
July 6, 2007