Physics, 06.03.2020 19:17 cookies1164
Consider the case of an adhesive joint created by bonding two poly(vinyl chloride) (PVC) (component A) sheets together with an epoxy adhesive (component B). The surface energies for the PVC solid surface, liquid epoxy, and PVC/epoxy interface are 47 erg/cm2, 41.7 erg/cm2, and 4.0 erg/cm2, respectively. (a) Calculate the work of cohesion (going from two interfaces to no interface) within the epoxy adhesive. This is the work required to separate epoxy bonds from one another. (b)Calculate the work of adhesion between one surface of the PVC sheet and the liquid epoxy. This is the work required to separate the epoxy from the PVC. (c) Calculate the free energy of spreading associated with epoxy 'wetting' the PVC. Will the epoxy spontaneously 'wet the PVC?
Answers: 3
Physics, 22.06.2019 09:30
On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( Ļ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?
Answers: 2
Physics, 22.06.2019 12:30
An engine undergoes a cycle as shown in the diagram. during a complete cycle the work done by the gas is 28.5Ć103 j and the energy transferred thermally out is 99.4Ć103 j. there are 1.5Ć1024 gas molecules and they have three active degrees of freedom. 6. (6 pts) during which process(es) is energy transferred thermally into the gas? a. 1ā2 b. 2ā3 c. 4ā1 d. 1ā2 and 4ā1 e. none of the above
Answers: 3
Physics, 22.06.2019 18:30
Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 Ā° angle with the vertical, what is the net charge on the ball?
Answers: 1
Physics, 22.06.2019 22:30
Which of these activities increases the amount of carbon in the atmosphere?
Answers: 1
Consider the case of an adhesive joint created by bonding two poly(vinyl chloride) (PVC) (component...
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