Chapter : 2. Force & Laws Of Motion
Examples Buoyancy
Example : 17
A solid block of volume 2 litres has a weight of 80 N. What will be its weight when immersed completely in water ?
Solution. In order to calculate the weight of the block in water, first calculate the upthrust, i.e. the loss in weight of the body in water, then
Volume of the block = 2 litres = 2000 cc
∴ Volume of water displaced = 2000 cc
Weight of water displaced = 2000 gm = 2.0 kgf
( Density of water = 1 gm/cc )
= 2.0 × 9.8 N = 19.6 N
∴ Upthrust of water = 19.6 N
Hence, weight of the body fully immersed in water = 80 N – 19.6 N = 60.4 N
Example : 18
A solid block of density D has a weight W in air is fully immersed in a liquid of density d. Calculate its apparent weight when fully immersed in liquid.
Solution. Weight of the block = W
Density of block = D
∴ Volume of the block =
∴ Upthrust on the block =
∴ Loss in weight of the block inside liquid =
Hence, apparent weight of the block when fully immersed in water
=
A solid block of volume 2 litres has a weight of 80 N. What will be its weight when immersed completely in water ?
Solution. In order to calculate the weight of the block in water, first calculate the upthrust, i.e. the loss in weight of the body in water, then
Volume of the block = 2 litres = 2000 cc
∴ Volume of water displaced = 2000 cc
Weight of water displaced = 2000 gm = 2.0 kgf
( Density of water = 1 gm/cc )
= 2.0 × 9.8 N = 19.6 N
∴ Upthrust of water = 19.6 N
Hence, weight of the body fully immersed in water = 80 N – 19.6 N = 60.4 N
Example : 18
A solid block of density D has a weight W in air is fully immersed in a liquid of density d. Calculate its apparent weight when fully immersed in liquid.
Solution. Weight of the block = W
Density of block = D
∴ Volume of the block =
∴ Upthrust on the block =
∴ Loss in weight of the block inside liquid =
Hence, apparent weight of the block when fully immersed in water
=
Trending Articles & Blogs
- Physics Tutor, Math Tutor Improve Your Child’s Knowledge
- How to Get Maximum Marks in Examination Preparation Strategy by Dr. Mukesh Shrimali
- 5 Important Tips To Personal Development Apply In Your Daily Life
- Breaking the Barriers Between High School and Higher Education
- 14 Vocational courses after class 12th
- Tips to Get Maximum Marks in Physics Examination
- Get Full Marks in Biology Class 12 CBSE
Download Old Sample Papers For Class X & XII
Download Practical Solutions of Chemistry and Physics for Class 12 with Solutions
Recent Questions Asked
- Newton’s laws of motion asked by Dr. Mukesh Shrimali
- Process of nutrition in Amoeba asked by Rajiv Sharma
- Importance of studying physics subject in school after 10th asked by Rajiv
- Refraction Through Prism in Different Medium asked by Kirti Sharma
- Ratio and Proportion Question asked by Education Desk
- Explain all the 12 tenses with example asked by Qwerty
- Refraction Through Prism in Different Medium asked by Seema Shrimali