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a bullet is fired horizontally at 800 ms and strikes a target that is 160 m from the gun if the marksman hears the
an isolated hydrogen atom possesses a hyperfine interaction between the proton and electron spins sp and se that takes
a thin uniform rod length 11 m mass 42 kg is pivoted about a horizontal frictionless pin through one of its ends the
suppose a 2000 watt laser beam is concentrated by lens a into a cross-sectional area of about 1 x 10-6 cm2 find the
if a solid is not completely submerged in the water will this technique error increase decrease or have no effect on
the greatest height reported for a jump into an airbag is 994 m by stuntman dan koko in 1948 he jumped from rest from
at 900k the following reaction has kp0345 2so2 o2-gt2so3 in an equilibruim mixture the partial pressure of so2 and o2
a 90 capacitor that had been charged to 30 is discharged through a resistor the figure figure 1 shows the capacitor
if the velocity of a 30 kg body changes fromv1 30icirc 50j ms to v2 0icirc 70j ms in a time interval of 20sa what is
a solid conducting sphere of radius 200cm has a charge 1500muc a conducting spherical shell of inner radius 400cm and
at 218 c kc12x10-4 for the equilibruim nh4hs-gtnh3 h2s calculate the equilibruim concentration of nh3 and h2s if a
a boat clashed on something and fell to the ocean floor a few years later a few researchers sent a robot and found out
a nuclear power plant operates at 75 of its maximum theoretical carnot efficiency between temperatures of 650 c and
consider a colloidal suspensionlike a solution of very small particles in a solvent we may think of this as an ideal
20 kg of water at 14 c is mixed with 20 kg of water at 53 c in a well-insulated container estimate the net change in
an object is placed 205rm cm from a screena at what two points between object and screen may a converging lens with a
a person works in a room for 4 hours with an activity of 3000 bqcubic meter of strontium chloride suspended in the air
an ideal gas is compressed reversibly at a constant temperature the compression reduces the volume b 180l the final
an engineer is designing the runway for an airport of the planes that will use the airport the lowest acceleration rate
a light beam is traveling through an unknown substance when it exits that substance and goes into air the angle of
consider that the human brain weighs about 1 kg and contains 1011 cells assuming that each cell is entirely filled with
a nitrogen molecule is confined in a cubic box of volume 100 m3 assuming that the molecule has an energy equal to 32kt
when catching a baseball a catchers glove moves by 8 cm along the line of motion of the ball if the baseball exerts a
rocket-powered sleds are used to test the human response to acceleration if a rocket-powered sled is accelerated to a
what is the yield of the reaction if a student reacted 200 g of salicylic acid with excess acetyl chloride and after