Case #3 Janet is putting a lot of effort into her final science report. She has neglected the course earlier in the year and has chosen a difficult topic to impress her teacher and get a good grade. Her friend
Sarah, who is a very good student, is working on the same topic. Janet asks whether she can work cooperatively with Sarah, as permitted by her teacher. Janet then puts in little further effort, knowing she can rely on Sarah to do a good job. Since she is Janet's friend, Sarah raises no objections to having Sarah simply put her name on the report and share the grade.
1. Since Sarah does not object, what is inappropriate about Janet's action?
2. What other options are open or available to Sarah?
3. If you were Sarah, what would you have done?
4. How could the teacher change the assignment without discouraging students' cooperation, while preventing students from simply taking credit for work done by
others?

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.