A crane is used to lower weights into the sea (seawater density = 1025 kg/m3) for an underwater construction project. What is the percentage reduction in the tension in the rope of the crane due to a rectangular 0.4 m × 0.4 m × 3 m concrete block (density = 2300 kg/m3) when it is completely immersed in water compared to the tension in the rope when it was suspended in air

A crane is used to lower weights into the sea (seawater density = 1025

1.	A crane is used to lower weights into the sea (seawater density = 1025 kg/m3) for an underwater construction project. What is the percentage reduction in the tension in the rope of the crane due to a rectangular 0.4 m × 0.4 m × 3 m concrete block (density = 2300 kg/m3) when it is completely immersed in water compared to the tension in the rope when it was suspended in air
A.	45%
B.	55%
C.	65%
D.	75%
Answer» B. 55%

Discussion

No Comment Found

Related MCQs

A floating body will remain in stable equilibrium, if
Consider the following statements pertaining to the metacentric height of ocean-going vessels:1) Increase in the metacentric height reduces the period roll2) Some control of period of roll is possible if Cargo is placed further from the centre liner of ship3) In warships and racing yachts, metacentric height will be larger than other categories of ships4) For ocean-going vessels, metacentric height is of the order of 30 cm to 120 cmWhich of the above statements are correct?
For the stability of a floating body, under the influence of gravity alone, which of the following is TRUE?
A cone of relative density 0.8 is to float in water with its axis vertical and vertex downwards. Find the least apex angle of the cone for stable equilibrium.
A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water weighs 11.3 g. what is the mass of copper contained in the alloy? Specific gravities of copper and zinc are 8.9 and 7.1 respectively.
A solid body of specific gravity 0.5 is 10 m long 3 m wide and 2 m high. When it floats in water with its shortest edge vertical, its metacentric height is:
A body of specific weight w1 floats on a liquid of specific weight w2. Then the ratio of the volume of the object above the liquid to its volume is:
Consider the following statements: The increase in metacentric height1) Increases stability2) Decreases stability3) Increases comfort for passengers in a ship4) Decreases comfort for passengers is a shipWhich of the above statements are correct?
If a submerged body, displaced from its equilibrium position, returns to its original position, it is called ______.
A wooden plank (sp.gr 0.5) 1 m × 1 m × 0.5 m floats is water with 1.5 kN load on it with 1 m × 1 m surface horizontal. The depth of plank lying below water surface shall be:

Discussion

No Comment Found

Related MCQs

Reply to Comment