Advertisements
Advertisements
Question
Solve the previous problem if the lead piece is fastened on the top surface of the block and the block is to float with its upper surface just dipping into water.
Advertisements
Solution
Given:
Mass of wood, mw = 200 g
Specific gravity of wood, ρW = 0.8 gm/cc
Specific gravity of lead, ρPB= 11.3 gm/cc
\[\text{ We know: }\]
\[\text{ Mg = w} \]
\[\text{ Thus, we have: } \]
\[( \text{m}_\text{w} + \text{m}_{\text{pb}} )\text{g} = \text{V}_\text{w} \times \rho \times g\] \[ [\rho = \text{ Density of water }]\]
\[ \Rightarrow 200 + \text{m}_{\text{pb}} = \frac{200}{0 . 8} \times 1\]
\[ \Rightarrow \text{m}_{\text{pb}} = 250 - 200 = 50 \text{gm}\]
APPEARS IN
RELATED QUESTIONS
Define the angle of contact.
Fill in the blanks using the word(s) from the list appended with each statement
Surface tension of liquids generally . . . with temperatures (increases / decreases)
In a conical pendulum, a string of length 120 cm is fixed at rigid support and carries a mass
of 150 g at its free end. If the mass is revolved in a horizontal circle of radius 0.2 m around a
vertical axis, calculate tension in the string (g = 9.8 m/s2)
The contact angle between pure water and pure silver is 90°. If a capillary tube made of silver is dipped at one end in pure water, will the water rise in the capillary?
The contact angle between water and glass is 0°. When water is poured in a glass to the maximum of its capacity, the water surface is convex upward. The angle of contact in such a situation is more than 90°. Explain.
When water droplets merge to form a bigger drop
If more air is pushed in a soap bubble, the pressure in it
The excess pressure inside a soap bubble is twice the excess pressure inside a second soap bubble. The volume of the first bubble is n times the volume of the second where n is
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.
Water level is maintained in a cylindrical vessel up to a fixed height H. The vessel is kept on a horizontal plane. At what height above the bottom should a hole be made in the vessel so that the water stream coming out of the hole strikes the horizontal plane at the greatest distance from the vessel.
How much amount of work is done in forming a soap bubble of radius r?
Describe an experiment to prove that friction depends on the nature of a surface.
Define the surface tension of a liquid.
How is surface tension related to surface energy?
What do you mean by capillarity or capillary action?
Obtain an expression for the excess of pressure inside a
- liquid drop
- liquid bubble
- air bubble
What is capillarity?
The surface tension of the two liquids is respectively 20 and 60 dyne cm-1. The liquids drop from the ends of two tubes of the same radius. The ratio of the weights of the two drops is ______
When one end of the capillary is dipped in water, the height of water column is 'h'. The upward force of 105 dyne due to surface tension is balanced by the force due to the weight of water column. The inner circumference of capillary is ______.
(Surface tension of water = 7 × 10-2 N/m)
Find the work done when a drop of mercury of radius 2 mm breaks into 8 equal droplets. [Surface tension of mercury = 0.4855 J/m2].
