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1. Use a suitable identity to get each of the following products. (iii) (2a – 7) (2a – 7)
12
Oct
1. Use a suitable identity to get each of the following products. (iii) (2a – 7) (2a – 7) 1. Use a suitable identity to get each of the following products. (iii) (2a – 7) (2a – 7) October 12, 2020 Category: Chapter 9 - Algebraic Expressions and Identities , Maths , NCERT Class 8 [...]
A metallic sphere of radius 1.0 × 10^−3 m and density 1.0 × 10^4 kg/m^3 enters a tank of water, after a free fall through a distance of h in the earth’s gravitational field. If its velocity remains unchanged after entering water, determine the value of h. Given: coefficient of viscosity of water = 1.0 × 10^−3 Ns/m^2,g = 10 m/s^2 and density of water =1.0× 10^3 kg/m3.
12
Oct
A metallic sphere of radius 1.0 × 10^−3 m and density 1.0 × 10^4 kg/m^3 enters a tank of water, after a free fall through a distance of h in the earth’s gravitational field. If its velocity remains unchanged after entering water, determine the value of h. Given: coefficient of viscosity of water = 1.0 [...]
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A metallic sphere of radius 1.0 × 10^−3 m and density 1.0 × 10^4 kg/m^3 enters a tank of water ,
after a free fall through a distance of h in the earth's gravitational field. If its velocity remains unchanged after entering water ,
determine the value of h . Given: coefficient of viscosity of water = 1.0 × 10^−3 Ns/m^2 ,
g = 10 m/s^2 and density of water =1.0× 10^3 kg/m3. ,
A bubble having surface tension T and radius R is formed on a ring of radius b(b<<R). Air is blown inside the tube with velocity v as shown. The air molecule collides perpendicularly with the wall of the bubble and stops. Calculate the radius at which the bubble separates from the ring.
12
Oct
A bubble having surface tension T and radius R is formed on a ring of radius b(b<<R). Air is blown inside the tube with velocity v as shown. The air molecule collides perpendicularly with the wall of the bubble and stops. Calculate the radius at which the bubble separates from the ring. each of radius [...]
A soap bubble is being blown on a tube of radius 1 cm. The surface tension of the soap solution is 0.05 N/m and the bubble makes an angle of 60 o with the tube as shown. The excess of pressure over the atmospheric pressure in the tube is :
12
Oct
A soap bubble is being blown on a tube of radius 1 cm. The surface tension of the soap solution is 0.05 N/m and the bubble makes an angle of 60 o with the tube as shown. The excess of pressure over the atmospheric pressure in the tube is : each of radius 2 mm [...]
A vessel whose bottom has round holes with diameter of 1 mm is filled with water Assuming that surface tenstion acts only at holes, then the maximum height to which the water can be filled in vessel without leakage is (given surface tension of water is 75×10^−3 N/m) and g = 10 m/s^2
12
Oct
A vessel whose bottom has round holes with diameter of 1 mm is filled with water Assuming that surface tenstion acts only at holes, then the maximum height to which the water can be filled in vessel without leakage is (given surface tension of water is 75×10^−3 N/m) and g = 10 m/s^2 A vessel [...]
A space 2.5 cm wide between two large plane surfaces is filled with oil. Force required to drag a very thin plate of area 0.5 m ^ 2 just midway the surfaces at a speed of 0.5 m/sec is 1 N. The coefficient of viscosity in kg s/m^ 2 is:
12
Oct
A space 2.5 cm wide between two large plane surfaces is filled with oil. Force required to drag a very thin plate of area 0.5 m ^ 2 just midway the surfaces at a speed of 0.5 m/sec is 1 N. The coefficient of viscosity in kg s/m^ 2 is: each of radius 2 mm [...]
A plate of area 2m^(2) is made to move horizontally with a speed of 2m//s by applying a horizontal tangential force over the free surface of a liquid. If the depth of the liquid is 1m and the liquid in contact with the bed is stationary. Coefficient of viscosity of liquid is 0.01 poise. Find the tangential force needed to move the plate.
12
Oct
A plate of area 2m^(2) is made to move horizontally with a speed of 2m//s by applying a horizontal tangential force over the free surface of a liquid. If the depth of the liquid is 1m and the liquid in contact with the bed is stationary. Coefficient of viscosity of liquid is 0.01 poise. Find [...]
The coefficient of viscosity of blood is 2.12 x 10^-3 Pa s and its density is 2.12 x 10^-3 Pa s. Find the blood flow rate ( in pie x 10^-6 m^3/s ), corresponding to the largest average velocity in an artery of radius 2 x 10^-3 m for the flow to be laminar.
12
Oct
The coefficient of viscosity of blood is 2.12 x 10^-3 Pa s and its density is 2.12 x 10^-3 Pa s. Find the blood flow rate ( in pie x 10^-6 m^3/s ), corresponding to the largest average velocity in an artery of radius 2 x 10^-3 m for the flow to be laminar. corresponding [...]
Capillary tubes of length l and 2l are connected in series, their radii are r and 2r respectively. If stream line flow is maintained and pressure difference across first and second capillary tubes are P1 and P2 respectively then find the ratio P1/P2.
12
Oct
Capillary tubes of length l and 2l are connected in series, their radii are r and 2r respectively. If stream line flow is maintained and pressure difference across first and second capillary tubes are P1 and P2 respectively then find the ratio P1/P2. Capillary tubes of length l and 2l are connected in series their [...]
A substance breaks down under a stress of 10^5 Pa. If the density of the wire is 2 × 10^3 kg/m^3, find the minimum length of the wire which will break under its own weight (g = 10 m/s^2).
12
Oct
A substance breaks down under a stress of 10^5 Pa. If the density of the wire is 2 × 10^3 kg/m^3, find the minimum length of the wire which will break under its own weight (g = 10 m/s^2). A substance breaks down under a stress of 10^5 Pa. If the density of the wire [...]