We was learning fluid this week then we have a lab about it. We have to calculat

Question

We was learning fluid this week then we have a lab about it. We have to calculate the density of zinc without measuring the volume.

So, when I was in lab, I hold a beaker with water, then I put a 70g zinc in and measured the weight of the zinc I got 60.2g.

Then we got a unknown 70g metal, I did the same thing then got a 101g. The problem is here. Both of them are supposed to be metal. One of them is float and one is sink. I can't back to the lab and redo it. And I am really confuse!!!!!! How to find their density :(

plx help.

We was learning fluid this week then we have a lab about it. We have to calculate the density of zinc without measuring the volume. So, when I was in lab, I hold a beaker with water, then I put a 70g zinc in and measured the weight of the zinc I got 60.2g. How do I calculate the density of it? I tried somthing like this and i got 7.143 which is pretty close to the density of zinc. Then we got a unknown 70g metal, I did the same thing then got a 101g. The problem is here. Both of them are supposed to be metal. One of them is float and one is sink. I can't back to the lab and redo it. And I am really confuse!!!!!! How to find their density :(

Explanation / Answer

see here the loss in weight of a substance when put in water is due to buoyant forces and it is equal to the weight of the displaced water from beaker

or say here your weight of water equal to volume of your zinc

so weight of displaced water=70-60.2=9.8 gm= volume of zinc bar* density of water

so, density

so your volume of zinc is = volume of 9.8 gm water=9.8cubic cm[density of water =1gm/cubic cm]

here

density of zinc is then

d=mass/volume=70/(9.8)=7.14285 gm/cubic cm

now to your new metal

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