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A girl riding a bicycle along a level road at 12 m/s decides to speed up. She does 8 kJ of work while moving 250 m along the road. At that time she is moving at 17 m/s. Specifications are: frame = 70 N, girl = 560 N, each tire = 13 N, the wheel radius is 46 cm and the height of the center of gravity of the girl above the ground is 75 cm. What is the average force of friction on the girl during the motion? Treat the wheels as thin rings.
two radio waves are used in the operation of a cellular telephone. to receive a call the phone detects the wave emitted
Carbon dioxide enters an adiabatic compressor at 100kPa and 300K at a rate of 0.5kg/s and exits at 600kPa and 450K. Considering constant specific heat, determine (a) isentropic efficiency of the compressor (b) the rate of entropy change in (kW/K) ..
question 1 a force of 750 n acts on point a in the x direction where the cables ab ac and ad are joined as shown in
a reciprocating engine for light aircraft modeled after the avco lycoming 0.235nbspengine has the following
a gate is 0.5 m wide and 0.6 m tall and is hinged at the bottom. on one side the gate holds back a 0.5 m deep body of
the potential at location a is 377 v. a positively charged particle is released there from rest and arrives at
toughness is proportional to the amount of energy storedput in to a material or structure when a stress is applied.
Calculate the steady state excess electron and hole concentrations as a function of distance into the semiconductor.
one liter of saturated liquid water is contained in a piston-cylinder assembly. initiallythe water pressure is 2bar.
determine the angle of twist of the end B of the solid section relative to end C. The tubes have an outer diameter of 30 mm and an inner diameter of 20 mm. The solid section has a diameter of 40 mm.
2.5 kg of h2o is contained in a piston-cylinder assembly initially at a pressure of 1.5 bar and a volume of 1.5m3. the
a charge of -3.30 microc is fixed in place. from a horizontal distance of 0.0435 m a particle of mass 7.65 10-3 kg and
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