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69 j of work are needed to stretch a spring from 14 m to 29 m from equilibrium what is the value of the spring
when the apollo astronauts were orbiting around the moon at low altitude they detected several mass concentrations
can someone draw this out for me show how one might synthesize phenylacetone using toluene nacn and any other necessary
the mass of pluto was not known until 1978 when a moon of pluto was finally discovered how did the discovery of this
how many rads does a 81- kg human receive each year from the approximate 10-8 grams of 14 c naturally present in her
the half life of mercury-197 used for kidney scans is 641 hours if a patient undergoing such a scan is given 50 ng of
two metal disks one with radius r1 255 cm and mass m1 0850 kg and the other with radius r2 490 cm and mass m2 157
explain how to make a stock solution of 500 m nacl and then how to use this stock solution to make 25 ml of 010 m
two identical 300-ohms wires are laid side by side and soldered together s they touch each other for half of their
explain how a nuclear fission reaction can be controlled to produce heat for power generation ratherthan an
a rifle with a weight of 20 n fires a 50-g bullet with a speed of 220 msa find the recoil speed of the rifleb if a
a voltaic cell consists of an mnmn2 half-cell and a pbpb2 half-cell calculate ecell when pb2 0616 m and mn2 1069 m
at one time television sets used rabbit-ears antennas such an antenna consists of a pair of metal rods the length of
you have been asked to review the calculations of an assistant with respect to the calculation of the internal energy
four hundred kgh of steam from a low pressure turbine at 125 atm and 250 c goes into a feed water heater which preheats
describe the components in the atom indicate the charge on each of the species and their location indicate the role if
a voltaic cell consist of a pbpb2 half cell and a cucu2 half cell at 25 c the initial concentrations of pb2 and cu2 are
a obtain the wavelength in vacuum for blue light whose frequency is 658 1014 hzblue nmb obtain the wavelength in
you are designing a drier that must evaporate 200 lbh of h2o from sludge by using air air at 70degf and 50 relative
a series circuit with a resistor and a capacitor has a time constant of 041 ms the circuit has an impedance of 419 o at
in a 131 t magnetic field directed vertically upward a particle having a charge of magnitude 860 uc and initially
a geiger counter is placed 1cm from a radioactive spill and gives a reading of 12000 cpm at what distance is the
in an rlc series circuit these three elements are connected in series a resistor of 670 a 330-mh inductor and a
an isotope of the element thalium ti-206 undergoes beta decay with a half life of 31 minutes assume you begin with 10
what is the value of the equilibrium constant at 25 oc for the reaction between the pair sns and pb2aq to give pbs and