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a hollow plastic sphere is held below the surface of a freshwater lake by a cord anchored to the bottom of the lake the
the element helium is thouhght to remain a liquid at absolute zero solid helium can be made only by exerting a pressure
a layer of oil with density 800 kgm3 floats on top of a volume of water with density 1000 kgm3 a block floats at the
dentists might use a mixture of 40 n2o and 60 o2 as an initial anesthetic of nitrous oxidealthough exact proprtions may
the eyepiece of a microscope has a focal length of 125 cm and the objective lens focal length is 126 cma if the tube
a refrigerator is the reverse of an engine work is performed to remove heat from a system making it colder the
a popular web site states that a 130 pound person will burn 472 calhr bicycling moderate effort and 649 calhr rock
estimate the fraction of electrons excited above the fermi level at room temp for aluminum the effective mass of al is
a suppose a certain large fish starts out at a depth where the absolute pressure is 21 atm and with gas bladder volume
the atomic mass of copper is 6355 amu given thatb there are two naturally occuring isotopes of copper 63cu and 65cu the
after the sun exhausts its nuclear fuel its ultimate fate will be to collapse to a white dwarf state in this state it
how much work is done by the moons gravitational field as a 1065 kg meteor comes in from outer space and impacts on the
a water sample with 35 ppm by mass of lead pb find the concentration of pb in mgl assuming fresh
a 25 kg bear slides from rest 12 m down a lodgepole pine tree moving with a speed of 56 ms just before hitting the
the dimensionless henrys constant for tce at 25 degrees celsius is 04 a sealed glass vial is prepared that has an air
tetraphosphorus decaoxide reacts with water to form phosphoric acid a major industrial acid in the laboratory the oxide
a 40 kg shell is shot with an initial velocity of magnitude 200 ms at an angle of 60o with the horizontal at the top of
what is the role played by rna and dna in genetic diseases and are there any breakthroughs in the treatment and
a 350-m long string has a linear mass density of 000850 kgm and is under a tension of 250 n find the frequency of the
suppose that you developed a new temperature scale based upon the freezing and boiling point of ethylene glycol which
calculate the frequency of an organ pipe with an effective length equal to 120 m that is closed on one side and open on
calculate the fundamental frequency for an organ pipe with an effective length equal to 120 m that is open at both ends
marble calcium carbonate reacts with hydrochloric acid solution to form calcium chloride solution water and carbon
one end of a 539-m long string is moved up and down with simple harmonic motion at a frequency of 690 hz if the wave
a 41500kg elevator accelerates upward at 500ms2 pulled by a cable of negligible mass find the tension force in the