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two blocks are suspended over a pulley the pulley can be treatedas a uniform solid cylindrical disk the downward
a combination of blue lightn160 and red light n150 is incident on the surface of a flat glass plate because of
the end of the cutting cord on a gas powered weed cutter is 015 m in length if the motor rotates at the rate of 20 revs
a merry-go-round at a playground is a circular platform that is mounted parallel to the ground and can rotate about an
green light of a wavelength 550 nm enter a piece of glass that hasindex of refraction n 15 for the light what is the
a titration was performed at 25 degrees c and the ksp of a slighlty soluble salt was determined to be 15times10-4
a tube is closed at one end and open to 16 o c air atthe other end the tube vibrates in the fifth harmonic at
what is the ph of a solution that contains 015 m hc2h3o2 and 028 m c2h3o2- use kb 56 x 10-10 for c2h3o2- ph
to fill a childs backyard inflatable wading pool you use a gardenhose with a diameter of 29 cm water flows from this
a star has a mass of 18 1030 kg and radiates energy at the rate of40 1026 w what fraction of its original mass has the
assume that the protons in a hot ball of protons each have akinetic energy equal to kt where k is the boltzmann
given a stationary phase of silica gel and nonpolar and polar analyte which would elute first also if given a polar
a very large tank contains the gas ethane the pressure of ethaneis 214 x 104 pa thereare 428 moles of this gas in
a 50-gram ice cube at -30 degrees celcius is heated until 45 grams has become water at 100 degrees celcius and 50 grams
a carboxylic acid can exist in two conformations e and z that are different by the dihedral angle around the c-o bond
a string 2m long is fixed at both ends it is found that standingwaves can be set up in this string for frequencies of
how many grams of sodium formate nacho2 would have to be dissolved in 14 l of 042 m formic acid pka 374 to make the
what advantages does liquid chromatography have over tlc and what advantages does liquid chromatography
a turnable platter has a radius of 0150 m and is rotating at349 rads when the power is shut off the platter slows down
what is the ph of a solution prepared by mixing exactly 561 ml of 0200 m hc2h3o2 with 149 ml of 0400 m koh ka for
a spherical balloon is made from a material whose massis 300 kg the thickness of thematerial is negligible compared to
in thin layer chromatography tlc what does the rf retention factor value represent what is a large rf value telling us
a a stars temperature is 5649 kaccording to the stefan-boltzmann law how much energy is radiatedinto space per second
a cube floats in waterthe length of each side 8 cm the cube is 34 submergeda find the volume of the water displacedb
a c-h bond absorbs at 2950 cm-1 replacing the 12c with 14c has a smaller effect on the position than replacing the 1h