- #1

- 22

- 0

Fb = W

W = pgV

15.76 = 8470 * 9.8 * V

15.76 = 83006V

1.89x10^-4 = V

13.86 = 8470 * 9.8 * V

13.86 = 83006V

1.66x10^-4 = V

1.89x10^-4 - 1.66x10^-4 = 2.3x10^-6

This is wrong. Why?

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- Thread starter brncsfns5621
- Start date

- #1

- 22

- 0

Fb = W

W = pgV

15.76 = 8470 * 9.8 * V

15.76 = 83006V

1.89x10^-4 = V

13.86 = 8470 * 9.8 * V

13.86 = 83006V

1.66x10^-4 = V

1.89x10^-4 - 1.66x10^-4 = 2.3x10^-6

This is wrong. Why?

- #2

radou

Homework Helper

- 3,120

- 6

Wrong calculation: 1.89x10^-4 - 1.66x10^-4 = 2.3x10^-5.

- #3

- 282

- 205

Remember, the mass (weight) difference in water tells you the mass (weight) of water displaced. So use this to find the volume of water displaced - then you know the volume of the whole brass thing.

Calculate what a SOLID brass thing of this volume should weigh.

Find the "missing" mass or weight then the volume.

There might be a quicker way. ......

- #4

- 282

- 205

Ah - you worked out the whole volume then the volume of just brass?

But did it work?

But did it work?

- #5

- 22

- 0

- #6

- 22

- 0

V= m/p

Air = 15.76 / 8470

= 1.8 x 10^-3

Water = 13.86 / 8470

= 1.6x10^-3

Difference of the two is 2x10^-4, which happens to be one of the answers.

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