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Define Upthrust and State Its S.I. Unit.

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प्रश्न

Define upthrust and state its S.I. unit. 

एका वाक्यात उत्तर
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उत्तर

The upward force exerted on a body by the fluid in which it is submerged is called the upthrust. Its S.I. unit is 'newton'.

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पाठ 5: Upthrust in Fluids, Archimedes’ Principle and Floatation - Exercise 5 (A) [पृष्ठ १०९]

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सेलिना Concise Physics [English] Class 9 ICSE
पाठ 5 Upthrust in Fluids, Archimedes’ Principle and Floatation
Exercise 5 (A) | Q 4 | पृष्ठ १०९

संबंधित प्रश्‍न

What causes buoyant force (or upthrust) on a boat ?


Relative density of a substance is expressed in g cm-3.


A boy get into a floating boat.

What happens to the buoyant force on the boat ?


Explain why an iron needle sinks in water, but a ship made of iron floats on water.


How does the liquid pressure on a diver change if : 

The diver moves horizontally?


The diagram below in Fig. 4.12 shows a device which makes the use of the principle of transmission of pressure.

  1. Name the parts labelled by the letters X and Y.
  2. Describe what happens to valves A and B and to the quantity of water in the two cylinders when the lever arm is moved down.
  3. Give reasons for what happens to valves A and B in part (ii).
  4. What happens when the release valve is opened?
  5. What happens to valve B in cylinder P when the lever arm is moved up?
  6. Give a reason for your answer in part (v).
  7. State one use of the above device.

Complete the following sentence :

Pressure at a point inside the liquid is ...................... To its depth.


The mass of a block made of certain material is 13.5 kg and its volume is 15 × 10-3 m3.

(a) Calculate upthrust on the block if it is held fully immersed in water.

(b) Will the block float or sink in water when released? Give a reason for your answer.

(c) What will be the upthrust on block while floating?

Take density of water = 1000 kg m-3. 


Two identical pieces, one of ice (density = 900kg per meter cube) and other wood (density = 300kg per meter cube) float on water.

  1. Which of the two will have more volume submerged inside water
  2. Which of two will experience more upthrust due to water.

A body is held inside water contained in a vessel by tying it with a thread to the base of the vessel. Name the three forces that keep the body in equilibrium, and state the direction in which each force acts. 


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