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two girls are sitting on the same side of a see-saw one girl is 28 kg and sitting 24 m away from the middle the other
a 015 kg meter stick is balanced with the pivot point at the 18 cm mark a weight of 32n is hung from the shorter end
the formula for caluculating a dilution of a solution is m1v1m2v2 use this equation to calculate the volume of a 20 m
a converging lens has a focal length of 155 cm if it is placed 725 cm from an object at what distance from the lens
a 630 kg astronaut is ona spacewalk when the tether line to the shuttle breaks the astronaut is able to throw a 100 kg
a block of mass m is attached to a fixed wall by means of a spring whose force constant is k the block slides on an
a radar unit sends out 005 microsecond pulses of microwaves whose wavelength is 25 mm what is the frequency of these
what would happen if the kinetic energy of the reactants were not enough to provide the needed activation
at an outdoor market a bunch of bananas is set into oscillatory motion with an amplitude of 201368 cm on a spring with
a spherical balloon is made from a material whose mass is 257 kg the thickness of the material is negligible compared
when ethyl chloride ch3ch2cl is dissolved in 10 m naoh it is converted into ethanol ch3ch2oh by the reactionch3ch2cl
a 745 n window washer is standing on a scaffold supported by a vertical rope at each end the scaffold weighs 123 n and
vanillin used to flavor vanilla ice cream and other foods is the substance whose aroma the human nose detects in the
a nickel crystal is used as a diffraction grating for x-rays then the same crystal is used to diffract electrons if the
a bimetallic strip 68cm by 1cm by 001cm has aluminum alpha 23 x 10-6 1c on one side has steel alpha 12 x 10-6 1c on
a solution containing 100 mmol cacl2 is diluted to 1 l calculate the number of grams of cacl2 2h2o per milliliter of
a farmer applies 17000 kg of a fertilizer that contains 100 of nitrogen to his fields each year fifteen 150 percent of
in biological cells that have a plentiful supply of o2 glucose is oxidized completely to co2 and h2o by a process
a camber carriers her drinks in an ice chest made of styrofoam the chest is 40 cm x 45 cm x 70 cm and the walls and lid
mercury is a 6th row and zinc is a 4th row transition metal if ionization energy depends upon effective nuclear charge
a certain ideal gas has a value of constant y which is cpcv 43 what is the molar specific heat at constant
copper has two naturally occurring isotopes63cu isotopic mass 629396 amu and 65cu isotopic mass 649278 amu if copper
one of the most efficient engines built so far has the following characteristics combustion chamber temperature
1 which of the following statements concerning the carbon dioxide molecule is correcta the molecule contains two sigma
a heat engine operating between 40 c and 380 c has an efficiency 60 of that of a carnot engine operating between the