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how many helium-filled balloons would it take to lift a person assume the person has a mass of 80kg and that each
a 250 ml sample of an hcl solution is titrated with a 0139 m naoh solution the equivalence point is reached when 154 ml
what mass of copper in g can be deposited by the passage of 10 a for 40 hr through a solution of
a solution is exposed to air where the partial pressure of n2 is 080 atm and the concentration of n2 in solution is
a transformer with 120 turns in its secondary supplies 12 volts at 220 ma to a toy train the primary is connected
if the concentration of lead iodide pbi2 in a saturated aqueous solution is 15 x 10-3 m what is the ksp of
a 1200 turn coil in a dc motor has an area per turn of 22 10-2m-2 the design for the motor specifies that the
the poh of a solution containing 030 m of a weak base is 392 what is kb for the
the non-constant angular acceleration of a wheel is given by atat a6 radianss3 at t100second the wheels angular
what mass of ar gas in g is contained in a 640 l tank in which its pressure is 0703 atm and the temperature is 640degc
an air-filled suppose k1 parallel-plate capacitor has plates of area 230 cm2 separated by 150 mma find the value of its
a copper cylinder and a brass cylinder are stacked end to end as in the drawing each cylinder has a radius of 029 cm a
what is the freezing point in degrees celcius of a solution prepared by dissolving 113 g of cano32 in 115g of water the
outline the way in which the health and safety at work act hasaw act 1974 controls work place health and safety compare
a painter wishes to know whether or not he can safely stand on aladder the ladder has a mass m1 50 kg which
two unknowns x and y both having the molecular formula c4h8o give the following results with four chemical tests
a converging lens f1 240 cm is located 560 cm to the left of a diverging lens f2 280 cm an object is placed to the
the problem gives you- 1-bromo-1-methylcyclohexane and the product is cyclohexanone you have to use two reagents or
the surface charge density on an infinite sheet is -20 x 10-6 coulomb an alpha particle is shot away from the plane at
a solution of dihydrogenphosphatehydrogenphosphate buffer has a molar ratio of k2hpo4 to nah2po4 of 213 calculate the
a certain system has 6x10624 degrees of freedom which internal energy increases by 1 then by what factor does the
a person slides from rest down a smooth hemispherical hill at what angle does this person leave the
a 5 kg block is placed at rest 5 m as measured from the uncompressed spring along a smooth 37degrees incline at the
a composite isolated system consists of one mole of a monatomic ideal gas and two moles of a diatomic ideal gas in a
maddie is standing still when her dancing partner paul begins to lift her up and throw her into the air maddies mass is