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if you twirl a small 90-g wooden ball in a circle at 30 revolutions per second on a light 11-cm string approximately
a 16-m-long string fixed at both ends vibrates at resonant frequencies of 708 hz and 1062 hz with no other resonant
a ship on the surface of the ocean receives a sonar echo back from an underwater object the echo path from the object
on a cold day 28100 j of heat leaks out of a house the inside temperature is 190deg c and the outside temperature is
what kind of mechanism can better account for the product mixture obtained from the dehydration of cis- and
a horizontal disk of mass 012kg and radius of 013m rotates freely about a vertical axis through its center with an
a 24 gev proton in cosmic radiation moves in earths magnetic field b with a velocity v perpendicular to b in a region
if one cubic centimeter section of a reactor has a macroscopic fission cross section of 0989 cm-1 and if the thermal
a bowling ball m 1200 kg moving to the right with a speed of 30 ms collides head on in a perfectly inelastic collision
when chlorine is added to acetylene 1122-tetrachlorothane is formed how many liters of chlorine will be needed to mkae
a telescope can be used as a camera if the film is placed at the image position of the objective lens or mirror so the
a compound forms cis-12-dimethylcyclopropane when it is reduced with h2 and pdc the h nmr spectrum of the compound
a conducting sphere with an inner insulating sphere inside of it carries a total charge of 5 nc the charge within the
a 145 g sample of an iron ore is dissolved in an acid and the iron is obtained as fe2 ag to titrate the solution 216 ml
a spherical asteroid has a radius of 545 km and a surface g of 30 ms2a what is the mass of the asteroidkgb what is the
a sample of material contains contains 20 mg of i 131 calculate a the number of i 131 atoms initially present b the
the majority of industrial method for the preparation of elemental phosphorus is heating a mixture of phosphate rock
for a particular reaction h 13999 kj and s 2987 jk calculate g for this reaction at 298 k is this reaction
a point mass on a hookes law spring is pulled aside 10 cm from the center position and then released the resulting
a ball hangs motionless from a ceiling by a stringhow many forces are acting on the ball what are
a sample contains a mixture of two dyes a and b the molar absorptivity coefficients for dye a are 4875 m-1cm-1 at 628nm
an aluminum cube 10 cm on a side is subject to shear stress a force of 40000 n acts on each of four faces calculate the
for the endothermic equilibrium caco3s nh4aq so42aq -gt caso4s nh3g hco3-aq explain the best set of changes to
11025g of dried carrots were extracted in hno3 the extract was filtered and placed in a 5000ml volumetric flask which
the rotational velocity of a merry-go-round increases at a constant rate from 06 radsec to 18 rads in a time of 4 swhat