Engineering, 20.01.2020 18:31 onlyceleste2430
With axle and spokes of negligible mass and a thin rim, a certain bicycle wheel has a radius of 0.39 m and weighs 33 n. it can turn on its axle with negligible friction. a man holds the wheel above his head with the axle vertical while he stands on a turntable that is free to rotate without friction. the wheel rotates clockwise, as seen from above, with an angular speed of 50.8 rad/s, and the turntable is initially at rest. the rotational inertia of wheel + man + turntable about the common axis of rotation is 2.1 kg·m2. the man's free hand suddenly stops the rotation of the wheel (relative to the turntable). determine the resulting angular speed and direction of rotation of the system. (include the sign. take clockwise as seen from above to be positive.)
Answers: 1
Engineering, 03.07.2019 14:10
Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.
Answers: 3
Engineering, 04.07.2019 19:10
The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object
Answers: 1
Engineering, 04.07.2019 19:20
The process in which the system pressure remain constant is called a)-isobaric b)-isochoric c)-isolated d)-isothermal
Answers: 3
Engineering, 04.07.2019 19:20
Afan that can provide air speeds up to 60 m/s is to be used in a low-speed wind tunnel with atmospheric air at 35 c. if one wishes to use the wind tunnel to study flat-plate boundary layer behavior up to reynolds numbes of re 10, what is the minimum plate length that should be used? at what distance from the leading edge would transition occur if the critical reynolds nurnber were rer,e = 5 × 105?
Answers: 2
With axle and spokes of negligible mass and a thin rim, a certain bicycle wheel has a radius of 0.39...
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