Consider an ice cube of edge 1.0 cm kept in a gravity free hall. Find the surface area of the water when the ice melts. Neglect the difference in densities of ice and water.
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There are 10 lamps in a hall. Each one of them can be switched on independently.Find the number of ways in which the hall can be illuminated.
Given : Total number of lamps =10 Since at least one lamp is to be kept switched on The total number of ways are 10C1+10C2+....10C10 ⇒210−1 ⇒1024−1 ⇒1023 Hence (B) is the correct answer.
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An ice cube is suspended in vacuum in a gravity-free hall. As the ice melts it
(b) will change its shape to spherical Explanation: When the ice cube melts, it changes its state from solid to liquid. This melted liquid has open surfaces where the surface tension forces...
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A 5.0 cm long straight piece of thread is kept on the surface of water. Find the force with which the surface on one side of the thread pulls it.
Length of the thread, L = 5.0 cm =0.05 m The surface tension of the water, S = 0.076 N/m Hence the force of surface tension on one side of the thread...
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A 5.0 cm long straight piece of thread is kept on the surface of water. Find the force with which the surface on one side of the thread pulls it.
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Consider a small surface area of 1 mm^2 at the top of a mercury drop of radius 4.0 mm. Find the force exerted on this area
The area of the given surface, A = 1 mm² =1x10⁻⁶ m². (a) The force exerted by the air above it =A*atmospheric pressure =1x10⁻⁶ m²*1.0x10⁵ N/m² =0.10 N (b) The surface tension of the...
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Find the surface energy of water kept in a cylindrical vessel of radius 6.0 cm. Surface tension of water = 0.075 J/m^2.
Thanks for the answer I was confused what to take area thanks
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Find the surface energy of water kept in a cylindrical vessel of radius 6.0 cm. Surface tension of water = 0.075 J/m^2.
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Find the surface energy of water kept in a cylindrical vessel of radius 6.0 cm. Surface tension of water = 0.075 J/m^2.
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There are 10 lamps in a hall. Each of them can be switched on independently. The number of ways in which the hall can be illuminated is
Since each bulb has two choices, either switched on or off, therefore required number = 210 – 1 = 1023.
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If the numbers representing volume and surface area of a cube are equal, then the length of the edge of the cube
(d) Let the length of the edge be a Now, a3 = 6a2 a = 6
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