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 15:10
If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.
Answers: 1
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 19:20
To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.
Answers: 1
Engineering, 04.07.2019 19:20
Determine (a) the maximum thermal efficiency of reversible power cycles operating between a hot reservoir at 1000°c and a cold reservoir at 200°c and (b) the maximum cops for reversible refrigeration and heat pump cycies, respectively, between 28°c and 14°c.
Answers: 1
Dr. baker has a nice collection of old-style vinyle records. to listen to his records, dr. baker use...
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