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a gas mixture composed of helium and argon has a density of 0670 gl at 755 mm hg and 298k what is the composition of
a ferris wheel is moving at an initial angular velocity of 10 rev54s if the operator then brings it to a stop
calculate the molality of commercial hcl solution which is 121molarity and has a density of 119gml and is
an initial mixture of nitrogen gas and hydrogen gas is reacted in a rigid container at a certain temperature by the
two ropes are pulling upward on a large crate the weight of the crate is 420 n the tension in the left rope is the same
a pinada practically in a shape of a slender thin rod of length mass 40 kg is hanging from the tree branch after being
the normal boiling point of benzene is 801 c and the heart of vaporization is h 308kjmol what is the boling point of
an aluminum cylinder is suspended in an unknown fluid by a spring scale outside the fluid the object weighs 20n in the
an old fashioned vinyl record rotates at a constant rate of 33 rpm if it plays music for 16 mins how far does a point
when a 470-v emf device is placed across two resistors in series a current of 150 a is flowing in each of the resistors
a 1000kg car moving 40ms skids to a stop during the skid the only force is the frictional force between the tires and
two wheels have the same mass and radius of 41 kg and 038 m respectively one hasa the shape of a hoop and the otherb
when extracting caffeine from coffee is it better to do two extractions with 10 ml of methylene chloride or one
a water heater consisting of a metal coil that is connected across the terminals of a 210-v power supply is able to
the drawing shows an a-shaped ladder both sides of the ladder are equal in length this ladder is standing on a
a biochemist studying the break down of insecticide ddt finds that it decomposes by a first-order reaction w a
a pitcher claims he can throw a 0160-kg baseball with as much momentum as a 250-g bullet moving with a speed of 150 103
a daredevil on a motorcycle leaves the end of a ramp with a speed of 360 ms as in the figure below if his speed is 338
the ph of a 00100 m hypothetical acid ha is 400 calculate the ka for this hypothetical
the constant of a reaction is 35 x 10-3 s-1 at 25 degrees celsius and the activation energy is 336 kjmol what is k at
when a battery is connected to a 890- resistor the current is 391 a when the same battery is connected to a 4170-
the delta h degrees f of tii3 s is -328 kjmol and the delta h degrees for the reaction 2 tis 3 i2g -----gt 2tii3 s is
the acceleration of gravity near the surface of the moon has about on-sixth the magnitude that it does on earth the
kc for the reaction co2 h2--------h2o co is 16 at about 990 c calculate the number of moles of carbon dioxide in the
a skier traveling 120 ms reaches the foot of a steady upward 18deg incline and glides 112 m up along this slope before