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During an experiment, it was found that an 80.0 kg man lost 0.260 kg of body fat having an energy content of 33.1 MJ/kg by lifting one 50.0 kg mass from the floor to a 1.50 m high shelf every 5.00 seconds continuously for 4.00 hours.
Ignoring respiratory and perspiration losses, determine the energy conversion efficiency of the muscular contractions.
A transformer consists of a 500 turn primary coil and a 2000 turn secondary coil. if 120v is applied to the primary, how many volts will appear across the secondary
Suppose a tank contains 680 m3 of neon (Ne) at an absolute pressure of 1.01 x 10^5 Pa. What is the increase in the internal energy of the neon
A non-conductor sphere of radius a has a negative chargedistribution given by the function p = -c / r2 where cis a positive constant with units of C/m) calculate the charge on the spher.
An isolated conductor has net charge +10 x 10-6 C and a cavity with a point charge q = +3 x 10-6 C. What is the charge on the cavity wall and the outer surface
An automobile jack supplied by the manufacturer in most cars requires you to rotate an input lever that turns a screw and allows several levers to lift the car. what is the maximum weight that the jack can lift
In the lungs there are tiny sacs of air, which are called alveoli. Assume the average diameter of one of these sacs is 0.27 mm. An oxygen molecule (mass = 5.3 10-26kg) trapped within a sac and the uncertainty in its position is 0.12 mm. W
A cubic centimeter in a typical cumulus cloud contains 50 to 500 water drops, which have a typical radius of 10 µm. How much mass does the water in the cloud have
A 0.23kg block oscillates between two 19N/m springs. What's the oscillation period
An oil drop of mass 3.3picogram (1 pg = 10-15 kg) hangs suspended between two large horizontal metal plates, Determine how many excess electrons does the drop have
A circuit employs a silicon solar cell to detect flashes of light lasting 0.25 s. what is the minimum power of a flash of light of wavelength
a boy whirls a small stone attached to a 1.5m string in a horizontal circle 2.0m above the ground. the string suddenly
A 1.0 kg ball drops vertically onto a floor, hitting with a speed of 28 m/s. It rebounds with an initial speed of 12 m/s. What impulse acts on the ball during the contact
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