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a hoist is powered by an electric motor that draws 482 kilowatts of electric power the system is 592 efficient ie 592
ball rolls 60cm to the porchs edge drops 40 cm continues rollingon the grass and eventually stops 80 cm from the
a t-bar tow is used to pull 80 skiers up a 600-m long slope inclined at 150 degrees to the horizontal at a speed of
a prove that a mass on a pendulum will execute steady circular motion if tandelta v2grb if a 40 kg mass goes 15 ms in
suppose the force on an object is 5i-8j n over a displacement of 5i2j metersa how much work is done by that forceb what
a 90 kg mass is on an inclined plane which is 16 degrees above horizontala if the above mass is connected by a pulley
a ceiling fan is turned on and reaches an angular speed of 120 rev min in 20s it is then turned off and coasts to a
the spring potential energy is given by u 12 kx2a use calculus to get the equation for a springs forceb the potential
sound exits a diffraction horn loudspeaker through a rectangular opening like a small doorway a person is sitting at an
a 4middotcm tall candle is placed 300middotcm from a lens with a focal length of 60middotcm note enter the absolute
in a specific heat experiment 2100 grams of aluminum c9130 jkgk at 1000degc is mixed with 360 g water at 200degca
the position vector for a portion is initially r 50i - 60j 20k and then later is r -20i 60j 20 all metersa what is
the masses of the earth and moon are 5981024 and 7351022 kg respectively identical amounts ofcharge are placed on each
joey weighs 77 lb and sits on a seesaw at a distance of 30 inches from the fulcrum jenny weighs 67 lb and sits on the
in a particular region of the earths atmosphere the electricfield above the earths surface has been measured to be 150
2 moles of ideal gas are kept at 57c while it expands to twice its volume the work done by the gas 38 kj what is the
filament is heated to 2000k and is a blackbody of area 1cm2 thermal power radiated is 907 wa at what wavelength is it
a 15 kg block rests on a level frictionless surface and is attached by a light string to a 50 kg hanging mass where the
what is the direction of the electric field along the positive zsemi-axis vertical if the field is created bya a
at 20degc a brass cube has an edge length of 35 cm what is the increase in the cubes surface area when it is heated
an object floating in a lake has 15 percent of its volume above the lake surface what is the density of the
a roller coaster at an amusement park has a dip that bottoms out ina vertical circle of radius r a passenger feels the
water at a pressure of 4 atm at street level flows into a building at 05 ms through a 6 cm diameter pipe the pipe
a 1500 kg car on a hydrolic lift rests on a cylinder with a piston of radius 020m if a connecting cylinder with a
a golf ball traveling 3 ms to the right has a head-on with astationary bowling ball in a friction-free environment if