Relative density problems | Examples - Kisembo Academy

In this video, we get to calculate relative density problems. For those who keep funding me via
Relative density calculation examples | solved problems - Kisembo Academy

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transcript;

we have quite a long question here I

think s we will have to first summarize

it it says that the block of mass 0.1

0:00:10.139,0:00:13.590
kilograms is suspended from a spring

0:00:11.849,0:00:15.059
balance when the block is immersed in

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the water of density a thousand

0:00:15.059,0:00:18.480
kilograms per meter cubed the spring

balance reads zero point six three

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Newtons when the block is immersed in a

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liquid of unknown density the spring

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balance reads zero point seven neutrons

0:00:25.230,0:00:32.219
the question is find that density of

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block the density of the liquid so we'll

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go ahead and first summarize this

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question so we are talking about a block

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it is having a mass of 0.1 kilograms so

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meaning mass of the block is going to be

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0.1 kilograms and it is suspended from a

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spring when the block is immersed in

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water of density that so meaning that

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the density of the water is a thousand

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kilograms per meter cubed now

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approaching is to say when the block is

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immersed in water of density a thousand

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kilograms the spring balance reads 0.63

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Newtons

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so when this window weight in water when

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this is the weight when with this solid

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or the block is immersed in water it's

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going to weigh 0.63 newtons for stop

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continue and say when the block is

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immersed in the liquid of unknown

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density so meaning that when it is in

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within its weight in liquid whose

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density is not known so meaning that the

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density of the liquid is not known the

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weight of the liquid the question says

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the spring balance reads zero point

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seven Newton so it's going to breed 0.7

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Newton's find that density of the block

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so we need the density of the block so

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the density of the block is also unknown

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and then the density of the liquid you

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so do not know the density of the liquid

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from what the question has given us you

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can see that we are having this is mass

0:02:04.110,0:02:08.849
of the block we have weight of when that

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block is immersed in water we have the

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weight of that blow

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it's a must in the liquid and we have

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the density of the liquid but we do best

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your water we do not know the density of

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the liquid and this ordinate may be this

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chapter no you know what we need to find

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these two out so what do we do here is

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simple first of all let's find the

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weight of the block we know that the

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mass of the block is 0.1 kilograms so

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the weight of the block or call it the

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weight of the block in air is going to

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be 0.1 which is the mass of the block

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given here multiply that by the

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acceleration due to gravity which is

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9.81 and so the weight of the block is

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going to become 0.98 1 Newton's help the

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weight of the block we have the weight

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when the block is immersed in water we

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have the weight of the block when it's

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immersed in the liquid whose density we

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do not know so let's go ahead and find

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the relative density of the block so the

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relative density of the block is going

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to be given by from a previous session

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we say that the relative density is

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given by weight of a substance in air
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divided by the apparent loss of weight in water and that is exactly what we are