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marisa does 32j of work to lower the window shade in herbedroom a distance of 80m how much force must marissa exert
at target prctice scott holds his bow and pulls the arrowback a distance of 030m by exerting an average force of 4000n
a string is 590cm long and has a mass of 300 ga wave travels at 495ms along this string a secondstring has the same
one gram of water changes from liquid to solid at a constantpressure of 100 atm and a constant temperature of 0degc in
give a nanoscale interpretation of the fact that at the melting point the density of solid mercury is greater than the
one of the most efficient engines ever built is a coal-fired steamturbine in the ohio valley driving an electric
the total number of neutrons in a diatomic chlorine molecule made up of one atom of ci-35 and one atom of ci-37
an electron approaches a potential barrier10 ev high and 030 nm wide if the electron has a 20 percentprobability of
the energy absorbed by an engine is seven times greater than the work it performsa what is its thermal efficiencyb what
1 quantum dots also known as nanocrystals are a special class of materials known as semiconductors which are crystals
a copper ball with a radius of 11 cm is heated until its diameter has increasedby 023 mm assuming a roomtemperature of
a cylinderical shaped metal rod is used to conduct heat whenthe temperature at one end is 100 degree celsius and at the
a tank contains benzene which has index of refraction150 a dime is on the botton of the tank when viewed atnormal
a baseball player friend of yours wants to determine his pitching speed you have him stand on a ledge and throw the
when an objectis placed 132cm from diverging thin lens itsimage is found to be 66 cm from the lens the lens is removed
a man with mass 700 kg stands on a platform withmass 250 kg he pulls on the free end of a rope thatruns over a pulley
the current in an electro magnet connected to a 240 v line is 145aat what rate must cooling water pass over the coils
ammonia the ammonia molecule nh3 has apermanent electric dipole moment equal to 147 d where 1 d 1debye unit 334
assuming that a neutron star has the same density as a neutron calculate the mass in kg of a small piece of a neutron
a 200 kg block hangs from a rubber cord being supported so thatthe cord is not stretched the unstretched length of the
a simple pendulum is made from a string that is 065m inlength with a mass of 02 kg attached to the free end the mass is
two identical tiny spheres carrying the same charge are 10m apartcenter to center in vacuum and experience an
an electron accelerated from rest through a voltage of 440 v enters a region of constant magneticfield if the electron
the distance between the first and fifth minima of a single-slitdiffraction pattern is 025 mm withthe screen 50 cm away