Engineering, 26.11.2019 21:31 dixonkaleo9
Dr. baker has a nice collection of old-style vinyle records. to listen to his records, dr. baker uses a turntable, which is rotating at 33 1/3 rev/min. during a moment of boredom, dr. baker put a coffee bean on his turntable 7.0 cm from the axis of rotation.
(a) calculate the acceleration of the coffee bean, assuming that it does not slip m/s^2.
(b) what is the minimum value of the coefficient of static friction between the bean and the turntable if the bean does not slip?
(c) suppose that the turntable achieves its angular speed by starting from rest and undergoing a constant angular acceleration for 0.75 s. calculate the minimum coefficient of static friction required for the bfean not to slip during the acceleration period
Answers: 2
Engineering, 03.07.2019 14:10
When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point
Answers: 3
Engineering, 04.07.2019 18:10
Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way
Answers: 2
Engineering, 04.07.2019 19:10
Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?
Answers: 3
Engineering, 04.07.2019 19:20
Determine the time of the day and month of the year at which the peak sensible cooling load occurs for a top floor, north-eastern corner room of an office building in durban for the following conditions: floor area: 8 x 8 x 3 m east and north walls: 115 mm face brick (outside), 20 mm air space, 115 mm ordinary brick (inside) with 15 mm plaster roof construction: suspended plasterboard ceiling, 450 mm air space, 150 mm concrete, 75mm screed, waterproofing no heat transfer across other surfaces window area 3x 1,5 m high in north wall only. ordinary glass with venetian blinds. lights and occupants : from 07: 00 to 18: 00 average light density: 25 w/m2 number of occupants : 5 seated, light office work room temperature 24°c
Answers: 3
Dr. baker has a nice collection of old-style vinyle records. to listen to his records, dr. baker use...
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