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a metallic surface is illuminated with light of wavelength 400 nm if the work function for this metal is 2487 ev what
the isotope 22na has a half-life of 260 years how much of a 100 gram sample would be left after 100
a sailor strikes the side of his ship just below the waterline he hears the echo of the sound reflected from the ocean
an unmarked police car traveling a constant 95 is passed by a speeder traveling 115 precisely 100 after the speeder
bromocresol green ka 20x10-5 is yellow in its protonated form hx and blue in its ionized form x- at what ph will
a ray of light traveling in the air strikes the surface of mineral oil at an angle of 279 degrees with the normal to
a woman and her dog are out for a morning run to the river which is located 4 km away the woman runs at 25 ms in a
suppose 050 moles of a substance reacts in 250 grams of water if the water temperature goes from 22 degrees c to 26
a 3400 resistor and a 16 microf capacitor are connected in series across a generator 600 hz 120 v rms determine the
objects with masses of 295 kg and a 595 kg are separated by 0300 m find the net gravitational force exerted by these
an acid-base equilibrium system is created by disolving 010 mol hf in water to a volume of 10 l what is teh effect of
a 0047 h inductor is wired across the terminals of a generator that has a voltage of 21 v and supplies a current of
in a modified version of the unknown acid analysis experiment a 07032 g sample of unknown monoprotic weak acid was
in a closed but uninsulated container 500g of water is shaken until its temperature increases by 3 degrees celsius the
what would be the ph of a buffer system containing 10 m nh3 and 010 m nh4cl kbnh3 18 x
a 3m long ladder leans against a frictionless wall the coefficent of static friction between teh ladder and the floor
a 50 kg person stands at the edge of a 74 m diameter circular platform which is mounted horizontally on frictionless
a sample of 15 g nawo4 dehydrate is dissolved in 25 ml di h2o 75g granulated zn was added then heated to 70 c 75 ml of
a current of 15 a is flowing through a resistance of 18omega what is the voltage difference across their
a beaker with 200 ml of an acetic acid buffer with a ph of 500 is sitting on a benchtop the total molarity of acid and
a radio transmitters rlc oscillator circuit initially stores all its energy in the capacitor then begins to oscillate
when two lenses are used in combination the first one forms an image that then serves as the object for the second lens
the 2s and 3s atomic orbitals of the h atom are orthogonal if they are both spherical in shape so what makes them
a 113-kg cylinder rolls without slipping on a rough surface at an instant when its center of gravity has a speed of 107
the composition by mass of methyl alcohol ethyl alcohol n-propyl alcohol and water in two solutions a and b are given