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a 250 mw coal-fired power plant burns fuel with an energy density of 350 mj kg-1 water enters the temp reduction
the primary coil of a step-up transformer is connected across the terminals of a standard wall socket and resistor 1
which requires more heat- a kg of air raised 20degrees celsius to 30 degrees celsius or a kg of aluminum raised from
suppose you are planning a trip in which a space craft is to travelat a constant velocity for exactly eightmonths as
a 390-mh inductor has a reactance of 240 komegaa what is the frequency of the ac current that passes through the
four identical particles of mass050 kg each are placed at the verticesof a 15 m multiplied by 15 m square andheld there
a pool ball istraveling at 20 ms towards an identical pool ball which isinitially atnbsprest after thecollision the
a stick of uniform density with mass m 8 kg and lengthl 07 m is pivoted about an axle which is perpendicularto its
the recovery time of a hot water heater is the time required to heat all the water in the unit to the desired
the momentum and the kinetic energy of particle ais six timesand seven times the momentum andthe kinetic energy of
the potential energy stored in the compressed springof a dart gun with a spring constant of 6650 nm is 1040 jfind by
calculate the change in potential energy of a 928 kg man when he takes an elevator from the first floor to 29th floor
cosmic microwave background radiation fills all space with anaverage energy density of 4 x 10-14 jm3 what is the
a 0120-kg yo-yo has an outer radiusr that is 520 times greaterthan the radius of its axle the yo-yo is in equilibrium
an air-filled parallel-plate capacitor has a capacitance of 1pf the plate separation is then doubled and na
a narrow beam of ultrasonic waves reflects off the liver tumor inthe figure below if the speed of the wave is 75 less
nbspa spherical neuron possesses 6x1011 non-gatedchannels each of which has a conductance of 50 ps the neuron
a and b went to rock climbing a and b used similar length rope but arope is more elasticwhich stretches a bit b has
1 why were the relative intensities of an elements spectral lines not all the same2 the next corresponding hydrogen
a calculate the speed of a proton that is accelerated from rest through a potential difference of 134vb calculate the
a magnetron in a microwave oven emits microwaves with frequency2450 mhvnbsp what magnetic field strength would be
a skier approaches the base of an icy frictionless hill with aspeed of 139 ms the hill slopes upwardat180circ above the
a 580 kg glider on an air track is attached to the end of aidea spring with a force costant of 452 nm it undergoes
a carnival clown rides a motorcycle down a ramp and around a vertical loop if the loop has a radius of 18m what is the
the two metal objects in fig 25-25 have net charges of 70pc and-70pc which result in a 20v potential difference between