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a heat pump keeps a house warm at 720 degrees fahrenheit when the outside temperature is 0 degrees fahrenheit how much
an air conditioning unit keeps a house cool at 68 degrees fahrenheit when the outsid temperature is 95 degrees
a skier wears a goose down jacket of thickness 375cm and total surface area of 125m2 the rate at which heat is
25 kg of water undergoes an isothermal reversible process beginning at 100degc saturated liquid and ending at 10 mpa
jane 50 kg and john 30 kg sit at opposite ends of a 50 m long boat 20 kg jane is on the left john is on the right
the conversion of an incident pressure wave to an electrical signal is
showed that ignoring friction the magnitude of adams acceleration down the slide would be a g sintheta 1 assuming
a federation starship 220times106kg uses its tractor beam to pull a shuttlecraft 220times104kg aboard from a
a block of mass 14 kg is attached to a horizontal spring that has a force constant 900 nm as shown in the figure
an electron in an infinite potential well a box makes a transition from the n 3 level to the ground state and in so
two identical traveling waves moving in the same direction are out of phase by 40 rad what is the amplitude of the
consider a particle of mass m contrained to lie on the surface of a cone with its vertex pointing down and half angle
a ballplayer standing at homeplate hits a baseball that is caught by another player at the same height above the ground
a ball is thrown from a point 10 m above the ground the initial velocity is 195 ms at an angle of 270deg above the
there is a region with a constant magnetic field 52t the magnetic field is directed out of the page a conducting rod
a steel wire 204 m long with a circular cross section must stretch no more than 260 cm when a 4003 n weight is hung
h-f molecule has spring constant of 970 nm assume that an h-f chemical laser which lases betwee vibrational states of
an eagle glides in a diretion parallel to the ground maintaining a constant velocity of 581 ms2 a wind gust
a 10- kg mass is attached to a string wrapped around a shaft of negligible mass and having a 80- cm radius a
my moter has effciency of 80 with a flywheel attached to its shaft the flywheel had a diamter of 2 ft and weighs 40
a concave mirror r 824 cm is used to project a transparent slide onto a wall the slide is located at a distance of 523
a dentists mirror is placed 31 cm from a tooth the enlarged image is located 63 cm behind the mirrora what kind of
if the average energy released in a fission event is 208 mev calculate the total number of fission events required to
the mass of dr smith and the skateboard are 80 k dr alex throws a 25 kg bal horizontally at 30 ms to the right at dr
a potential difference of 90 mv exists between the inner and outer surfaces of a 75 nm thick cell membrane the inner