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3. Find the following squares by using the identities. (iii) (6x^2 – 5y)^2
12
Oct
3. Find the following squares by using the identities. (iii) (6x^2 – 5y)^2 3. Find the following squares by using the identities. (iii) (6x^2 – 5y)^2 October 12, 2020 Category: Chapter 9 - Algebraic Expressions and Identities , Maths , NCERT Class 8 ,
3. Find the following squares by using the identities. (ii) (xy + 3z)^2
12
Oct
3. Find the following squares by using the identities. (ii) (xy + 3z)^2 3. Find the following squares by using the identities. (ii) (xy + 3z)^2 October 12, 2020 Category: Chapter 9 - Algebraic Expressions and Identities , Maths , NCERT Class 8 ,
3. Find the following squares by using the identities. (i) (b – 7)^2
12
Oct
3. Find the following squares by using the identities. (i) (b – 7)^2 3. Find the following squares by using the identities. (i) (b – 7)^2 October 12, 2020 Category: Chapter 9 - Algebraic Expressions and Identities , Maths , NCERT Class 8 ,
A tapering glass capillary tube A of length 0.1 m has diameters 10^−3 m and 5 × 10^4 m at the ends. When it is just immersed in a liquid at 0∘C with larger radius in contact with liquid surface, the liquid rises 8 × 10^−2 m in the tube. In another experiment, in a cylindrical glass capillary tube B, when immersed in the same liquid at 0∘C, the liquid rises to 6 × 10^−2 m height. The rise of liquid in tube B is only 5.5 × 10^−2 m when the liquid is at 50∘C. Find the rate at which the surface tension changes with temperature considering the change to be linear. The density of liquid is (1/14) × 10^4 kg/m^3 and the angle of contact is zero. Effect of temperature on the density of liquid and glass is negligible.
12
Oct
A tapering glass capillary tube A of length 0.1 m has diameters 10^−3 m and 5 × 10^4 m at the ends. When it is just immersed in a liquid at 0∘C with larger radius in contact with liquid surface, the liquid rises 8 × 10^−2 m in the tube. In another experiment, in a [...]
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A tapering glass capillary tube A of length 0.1 m has diameters 10^−3 m and 5 × 10^4 m at the ends. When it is just immersed in a liquid at 0∘C with larger radius in contact with liquid surface ,
each of radius 2 mm ,
fall through aiir at a terminal velocity of 8 cm/s. If they coalesce to form a single drop ,
in a cylindrical glass capillary tube B ,
n drops of water ,
the liquid rises 8 × 10^−2 m in the tube. In another experiment ,
then the terminal velocity of the combined drop is 32 cm/s. Find n. ,
when immersed in the same liquid at 0∘C ,
2. Use the identity (x + a) (x + b) = x^2 + (a + b) x + ab to find the following products. (vii) (xyz – 4) (xyz – 2)
12
Oct
2. Use the identity (x + a) (x + b) = x^2 + (a + b) x + ab to find the following products. (vii) (xyz – 4) (xyz – 2) 2. Use the identity (x + a) (x + b) = x^2 + (a + b) x + ab to find the following products. [...]
2. Use the identity (x + a) (x + b) = x^2 + (a + b) x + ab to find the following products. (vi) (2a^2 + 9) (2a^2 + 5)
12
Oct
2. Use the identity (x + a) (x + b) = x^2 + (a + b) x + ab to find the following products. (vi) (2a^2 + 9) (2a^2 + 5) 2. Use the identity (x + a) (x + b) = x^2 + (a + b) x + ab to find the following products. [...]
A long thin walled capillary tube of mass M and radius r is partially immersed in a liquid of surface tension T. The angle of contact for the liquid and the tube wall is 30∘. How much force is needed to hold the tube vertically? Neglect buoyancy force on the tube.
12
Oct
A long thin walled capillary tube of mass M and radius r is partially immersed in a liquid of surface tension T. The angle of contact for the liquid and the tube wall is 30∘. How much force is needed to hold the tube vertically? Neglect buoyancy force on the tube. each of radius 2 [...]
2. Use the identity (x + a) (x + b) = x^2 + (a + b) x + ab to find the following products. (v) (2x + 5y) (2x + 3y)
12
Oct
2. Use the identity (x + a) (x + b) = x^2 + (a + b) x + ab to find the following products. (v) (2x + 5y) (2x + 3y) 2. Use the identity (x + a) (x + b) = x^2 + (a + b) x + ab to find the following products. [...]
A small steel ball falls through a syrup at a constant speed of 10cm/sec. If the steel ball is pulled upwards with a force equal to twice its effective weight; find the terminal velocity of the ball ( in cm/s ) in this case.
12
Oct
A small steel ball falls through a syrup at a constant speed of 10cm/sec. If the steel ball is pulled upwards with a force equal to twice its effective weight; find the terminal velocity of the ball ( in cm/s ) in this case. each of radius 2 mm fall through aiir at a terminal [...]
2. Use the identity (x + a) (x + b) = x^2 + (a + b) x + ab to find the following products. (iv) (4x + 5) (4x – 1)
12
Oct
2. Use the identity (x + a) (x + b) = x^2 + (a + b) x + ab to find the following products. (iv) (4x + 5) (4x – 1) 2. Use the identity (x + a) (x + b) = x^2 + (a + b) x + ab to find the following products. [...]