TO BE WRITTEN IN THE CLASS WORK BOOK
LAST DATE OF SUBMISSION- 3/9/21, 5:00 P.M
L12- PRESSURE
Answer the following:- 1. A suitcase of mass 25 kg measures 10 cm x 40 cm x 1.2 m.
i) Calculate the weight of the suitcase.
ii) Draw a diagram to show how the suitcase must rest to exert
maximum pressure on the ground.
iii) Calculate the maximum pressure (in Pa) that the suitcase can exert.
iv) Calculate the minimum pressure (in Pa) that the suitcase will exert on
the ground.
2. Why does a fountain pen ink leak at a high altitude?
3. Sumit wanted to study the variations in the atmospheric pressure on a
hot summer day. He took the readings at 6 am in morning and
recorded it. Later at 12 O’clock, he took the second reading, followed by
the third reading at 6 pm. How does the atmospheric pressure change?
Does it increase, decrease or remain the same?
Give a reason for your
answer.
4. Why are water tanks placed at a certain height?
5. If the area of our head is 15cm x 15 cm, the weight of air on our head
will be 225 N. Why doesn’t such a large weight of the air crush us?
6. Observe the given diagram and answer the following questions giving
suitable reasons:
i) In which of the cases A, B or C is maximum pressure exerted?
ii) In which of the cases A,B or C is the pressure exerted the same?
7. An inflated balloon is placed in a jar, which is connected to a vacuum
pump. What happens if the air inside the jar is pumped out?
8. How can pressure be increased by exerting the same force?
9. Calculate the mass of an object exerting 2000 Pa of pressure on an
area of 200 cm2
Answers
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Answer:
The last soldier to leave Afghanistan on the day the U.S. concluded its 20-year war has been identified as Major General Chris Donahue, commander of the U.S. Army 82nd Airborne Division, XVIII Airborne Corps. Donahue was one of the commanders on the ground leading the evacuation mission.
General Kenneth F. McKenzie, the commander of the U.S. Central Command, said Monday that the last U.S. aircraft left Afghanistan on August 30 at 3:29 p.m. ET, or 11:59 p.m. in Kabul.
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