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Selina Solutions Class 9 Physics Solutions for Exercise 5C in Chapter 5 - Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation

Question 4 Exercise 5C

A solid iron ball of mass 500g is dropped in mercury contained in a beaker, (a) Will the ball float or sink? Give reason. (b) What will be the apparent weight of the ball? Give reason

Answer:

(a) The ball will float. It is because the density of the iron ball is lesser than the density of mercury.

(b) The apparent weight of the ball is zero. It is because, while floating, upthrust will be equal to the weight

Video transcript
"hello everyone welcome to leader learning i'm good great your science tutor today's question is a solid iron ball of mass 500 grams is dropped in mercury contained in a beaker a will the ball float or sink and give reason b what will be the apparent weight of the ball give reason so in this question a situation is given that a solid iron ball of mass 500 gram is dropped in the mercury contained in a beaker so according to this situation you have to answer the two parts a and b let us start for the a part they are asking will the ball float or sink give reason so for the a part that is the ball will float because the density of iron ball is lesser than the density of mercury so this is why the ball of iron will float in the mercury now for the b part you have to tell what will be the apparent weight of the ball here since the up thrust will be equal to the weight so the apparent weight here will be zero why it will be zero because while floating up thrust will be equal to the weight weight of iron ball here so the apparent weight will be zero for more such videos please subscribe leader learning and for any doubts drop a comment thank you"
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