Friday
April 18, 2014

Posts by fifi


Total # Posts: 15

physics
the binding energy of a nucleus is 240.0 MeV. What is the mass defect of the nucleus in atomic mass units?

physics
For a hydrogen atom, determine the ratio of the ionization energy for the n = 3 excited state to the ionization energy for the ground state.

physics
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?

physics
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?

physics
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.

calculus
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...

calculus
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.

history
thank you now i can go to bed and snore and drool as usual

history
me needs help!!!!!! AHHHHHHHHH!!!!!!!! Its ten o'clock I have to go to bed!!!

history
Describe the role of the senate in Rome???

math
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.

Algbera
it should be written as ( 5ft x 10 ft) and (5ft x 5ft)...is that correct?

geometry
2. Point B is between A and C. If BC = 11 cm and AC = 17 cm, what is AB? (Points : 3)

3rd grade
colored light cloting wear

chemistry
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 rea...

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