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the coefficient of performance of a refrigerator is defined as the ratio of heat extracted from the refrigeration
a solar cell provides an emf of 020 va if the cell supplies a constant current of 215 ma for 80 h how much electrical
in a certain automobile engine with an efficiency of 209 combustion of gasoline in one cylinder releases 510 j of heata
a parallel plate capacitor of capacitance 76 microf has the space between the plates filled with a slab of glass with
on a cold night the temperatures of the two surfaces of a glass windowpane in a house are 78deg c on the outer surface
the sun is 15 1011 m from the eartha over what surface area is solar radiation spread at this distanceb what is the
a person sitting quietly in a room on a winter day may lose heat primarily by radiation from the outer surface of her
ice of mass 520 g at -106deg c is added to 188 g of water at 145deg c in a 102 g glass container of specific heat 0200
a pot containing 106 liter of water initially at 22degc is placed on a 1091 w electric heating elementa how much heat
a 200 kg box slides up a 120 m long incline at an angle of 300 degrees with the horizontal a force of 150 n is applied
a 500 gram bullet has a velocity of 300 ms it strikes a block of wood and penetrates to a distance of 200 cm the
a large parallel plate capacitor has plate separation of 090 cm and plate area of 361 cm2 the capacitor is connected
a bicycle with 08-m-diameter tires is coasting on a level road at 56ms a small blue dot has been painted on the tread
a box m112 kg is being pulled up an not necessarily frictionless incline by another mass m2085 kg which is descending
a parallel-plate air capacitor of area a 190 cm2 and plate separation d 280 mm is charged by a battery to a voltage 580
a 7700-kg boxcar traveling 18ms strikes a second car the two stick together and move off with a speed of 50ms what is
a 20 m pendulum is released from rest when the support string is at an angle of 25 degrees with the verticala what is
proponents of astrology claim that the positions of the planets at the time of a babys birth will affect the life of
a ball is thrown at an initial velocity of 105 mph upward at a roof the ball is thrown a distance of 100 ft from the
the drive propeller of a ship starts from rest and accelerates at 270 x 10-3 rads2 for 310 x 103 s for the next 130 x
the step-down transformer in a local neighborhood reduces the voltage from a 7200 v line to 120 vwhat are the power
the step-down transformer in a local neighborhood reduces the voltage from a 7200 v line to 120 vwhat current does the
a block of mass m1 3 kg is sliding across a frictionless table at a speed of v1 3 ms you send a second mass m2 2 kg
the step-down transformer in a local neighborhood reduces the voltage from a 7200 v line to 120 va if there are 125
a swimming pool requiring a 20 hp motor to filter and circulate the water runs for 18 hours a day what is the monthly