Chapter 7 Numerical Solution | 7.7 to 7.12 | Physics |Class 9 Physics |Matter Class9th اردو / हिंदी

In today lecture, we are going to solve the numerical problems of chapter 7 (Properties of Matter) of 9th class physics. This is the 2nd part of this chapter in which we will solve last six numerical such as from 7.7 to 7.12 from the exercise. We provide most easy and authentic method to solve these problems. Hope you like it.

Other chapter's videos:
Chapter 7: (7.1 to 7.6):    • Chapter 7 Numerical Solution | 7.1 to 7.6|...  

Chapter 6: (6.1 to 6.5):    • Chapter 6- Numerical Solution  اردو / हिंद...  
Chapter 6: (6.1 to 6.5):    • Chapter 6 Numericals Solution (6.6 to 6.10...  

Chapter 5: (5.1 to 5.5):    • Chapter 5- Numerical (5.1 to 5.5) Solution...  
Chapter 5: (5.6 to 5.10):    • Chapter 5- Numerical (5.6 to 5.10) Solutio...  

Chapter 4: (4.1 to 4.5):    • Chapter 4- Numerical (4.1 to 4.5) Solution...  
Chapter 4: (4.6 to 4.10):    • Chapter 4- Numerical (4.6 to 4.10) Solutio...  

Chapter 3: (3.1 to 3.5):    • Chapter 3- Numerical (3.1 to 3.5) Solution...  
Chapter 3: (3.6 to 3.10):    • Chapter 3- Numerical (3.6 to 3.10) Solutio...  

Chapter 2: (2.1 to 2.5):    • Chapter 2- Numerical (2.1 to 2.5) Solution...  
Chapter 2: (2.6 to 2.10):    • Chapter 2- Numerical (2.6 to 2.10) Solutio...  

Chapter 1: (1.1 to 1.5):    • Chapter 1- Numericals (1.1 to 1.5 ) Soluti...  
Chapter 1: (1.6 to 1.10):    • Chapter 1 Numericals ( 1.6 to 1.10 ) Solut...  

Numerical statements solve in this video:

7.7: A uniform rectangular block of wood 20 cm x 7.5 cm x 7.5 cm and of mass 1000g stands on a horizontal surface with its longest edge vertical. Find (i) the pressure exerted by the block on the surface (ii) density of the wood.

7.8: A cube of glass of 5 cm side and mass 306 g, has a cavity inside it. If the density of glass is 2.55 gcm-3. Find the volume of the cavity.

7.9: An object has weight 18 N in air. Its weight is found to be 11.4 N when immersed in water. Calculate its density. Can you guess the material of the object?

7.10: A solid block of wood of density 0.6 gcm-3 weighs 3.06 N in air. Determine (a) volume of the block (b) the volume of the block immersed when placed freely in a liquid of density 0.9 gcm-3 ?

7.11: The diameter of the piston of a hydraulic press is 30 cm. How much force is required to lift a car weighing 20 000 N on its piston if the diameter of the piston of the pump is 3 cm?

7.12: A steel wire of cross-sectional area 2x10-5 m2 is stretched through 2 mm by a force of 4000 N. Find the Young's modulus of the wire. The length of the wire is 2 m.

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properties of matter
gases
liquids
solids
stress
strain
young's modulus
pressure of liquids
principle of floatation
archemdies principle
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