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The length of a needle floating on water is 2.5 cm. The minimum force in addition to ties weight needed to lift the needle above the surface of water will be (surface tension of water is 0.072 N/m)
11
Oct
The length of a needle floating on water is 2.5 cm. The minimum force in addition to ties weight needed to lift the needle above the surface of water will be (surface tension of water is 0.072 N/m) The length of a needle floating on water is 2.5 cm. The minimum force in addition to [...]
Two parallel wires each of length 10 cm are 0.5 cm apart. A film of water is formed between them. If the surface tension of water is 0.072 N/m, then the work done in on increasing the distance between the wires by 1 mm is
11
Oct
Two parallel wires each of length 10 cm are 0.5 cm apart. A film of water is formed between them. If the surface tension of water is 0.072 N/m, then the work done in on increasing the distance between the wires by 1 mm is then the work done in on increasing the distance between [...]
2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube. (iv) 675
11
Oct
2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube. (iv) 675 2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube. (iv) 675 October 11, 2020 Category: Chapter 7 - Cubes and Cube Roots [...]
A spherical ball falls through viscous medium with terminal velocity v. If this ball is replaced by another ball of the same mass but half the radius, then the terminal velocity will be (neglect the effect of buoyancy)
11
Oct
A spherical ball falls through viscous medium with terminal velocity v. If this ball is replaced by another ball of the same mass but half the radius, then the terminal velocity will be (neglect the effect of buoyancy) A spherical ball falls through viscous medium with terminal velocity v. If this ball is replaced by [...]
A ball rises to the surface of a liquid with constant velocity. The density of the liquid is four time the density of the material of the ball. the frictional force of the liquid on the rising ball is greater than the weight of the ball by a factor of
11
Oct
A ball rises to the surface of a liquid with constant velocity. The density of the liquid is four time the density of the material of the ball. the frictional force of the liquid on the rising ball is greater than the weight of the ball by a factor of A film of soap solution [...]
A capillary tube is attached horizontally to a constant pressure head arrangement. If the radius of the capillary tube is increased by 10%, then the rate of flow of the liquid shall change nearly by
11
Oct
A capillary tube is attached horizontally to a constant pressure head arrangement. If the radius of the capillary tube is increased by 10%, then the rate of flow of the liquid shall change nearly by A capillary tube is attached horizontally to a constant pressure head arrangement. If the radius of the capillary tube is [...]
2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube. (iii) 72
11
Oct
2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube. (iii) 72 2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube. (iii) 72 October 11, 2020 Category: Chapter 6 - Squares and Square Roots [...]
2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube. (ii) 256
11
Oct
2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube. (ii) 256 2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube. (ii) 256 October 11, 2020 Category: Chapter 6 - Squares and Square Roots [...]
A hollow sphere has a small hole in it. On lowering the sphere in a tank of water, it is observed that water enters into the hollow sphere at a depth of 40 cm below the surface. Surface tension of water is 7 × 10^−2 N/m. The diameter of the hole is
11
Oct
A hollow sphere has a small hole in it. On lowering the sphere in a tank of water, it is observed that water enters into the hollow sphere at a depth of 40 cm below the surface. Surface tension of water is 7 × 10^−2 N/m. The diameter of the hole is A hollow sphere [...]
2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube. (i) 243
11
Oct
2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube. (i) 243 2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube. (i) 243 October 11, 2020 Category: Chapter 6 - Squares and Square Roots [...]