Engineering, 20.08.2019 18:30 sierram298

Consider a (9,6) swcnt that is 1000 nm long and answer the following questions. a. what is the diameter of this swcnt? [the nearest distance in the graphene sheet, b=0.142] b. what is its chiral angle? c. is this tube metallic or semiconducting? d. assuming the elastic modulus of 1500 gpa, how much the nanotube will extend if a force of 1nn or 10-9n is applied along the axis of this tube? [elastic modulus= stress/strain, stress= force/cross-section area, strain= change in length/original length] e. estimate the number of defects in a (9,6) carbon nanotube that extends from earth to international space station (iss) that is approximately 200 miles above earth. the energy needed to create a point defect is 1 ev and assume the temperature to be 300 k

Answers: 1

Show answers

Another question on Engineering

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

Answer

Engineering, 04.07.2019 19:20

Acompressor compresses a gas, a pump compresses a liquid. for a given pressure ratio, why does it take more work to compress a gas in a compressor than a liquid in a pump? a)- for a given pressure ratio the average specific volume for a gas is much higher than the average specific volume for a liquid. b)- there is no difference. the only difference is the amount of heat generated (not work) c)- for a given pressure ratio the average volurge for a gas is much higher than the average volume for a liquid. d)-there is no difference

Answers: 3

Answer

Engineering, 06.07.2019 03:20

Aload of 10kn is to be suddenly applied to the free end of a vertical rod of length 500 mm, the upper end being rigidly fixed. 190 mechanical science what should the diameter of the rod be if the maximum stress in the rod is not to exceed 100 mpa? the tensile modulus of the rod is 205 gpa.

Answers: 2

Answer

Engineering, 06.07.2019 03:20

Write a technical essay (maximum two pages) about stress concentration. and paste from the textbook. instead, read updated material about this phenomenon and provide a technical evaluation of the different techniques to avoid/reduce such phenomenon. consider in your analysis cutting-edge computational techniques such as fea to study and analyze stress concentrations.

Answers: 2

Answer

You know the right answer?

Consider a (9,6) swcnt that is 1000 nm long and answer the following questions. a. what is the diame...

Questions