00:01
Hi, in this question they are saying that in 1983, the united states began coining the one cent piece out of copper clad zinc rather than pure copper.
00:12
Now, the mass of old copper coin is 3 .083 gram and the mass of new coin is given as 2 .517 gram.
00:23
So the density of copper is given as 8 .920 gram per centimeter cube.
00:30
And density of zinc is given as 7 .13 gram per centimeter cube.
00:37
Now, the volume of both these coins are same.
00:41
So we have to calculate the percent of zinc in the new cent.
00:47
So first of all, we'll calculate the volume of the copper coin, which will be equals to mass of copper coin divided by density of copper coin, which is 3 .083 divided by 8 .920.
01:04
Now, the mass of the new copper coin is given as 2 .517 gram.
01:14
So if we let that mass of copper in this coin is x, then mass of zinc, will be equals to the mass of the new coin minus x as the total sum is given as mn...