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Engineering
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26 Sep 2019

Calculate the work done in pushing a chair to a distance of 3 meters with an average force of 20 Newton.

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Jean Keeling
Jean KeelingLv2
14 Aug 2019
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Related questions

Which of the following statements is correct about stress in engineering?

  1. The SI unit of stress is Newton

  2. It is the internal force expressed per unit area of a body

  3. The normal stress is coplanar with the area of cross-section 

  4. None of these

What will happen when a fixed amount of gas goes through an isobaric expansion?

  1. There will not be any transfer

  2. The pressure of the gas will change

  3. There must be an increase in temperature

  4. There will not be any work done

  1. Only source of BOD in a river is untreated wastes that are being discharge from a food processing plant. The characteristics of untreated waste is not reported for the environmental protection agency of the town . To identify the waste water property from the processing plant the authority measured the DO of the river at 10km and 40km away from the plant and found 5mg/l and 2.5mg/l respectively. The average flow rate of the river is 0.25m/s and average depth is 4.5m with bed activity coefficient of 0.2.assume saturation DO 10mg/l

Parameter            river     waste water  

Flow,m3/s         0.7            0.23

BOD @ 18°C        2.5           N/A

DO, mg /l             8             N/A

Temperature       20            20

K @ 20°c             -                  0.23

a. What is the DO and BOD of the untreated waste form the processing plant? 

b. What is the critical DO and where downstream does it occur?

c. If the state requirement for minimum DO is 2mg/l is assimilative of the river restricted or not ?

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