Question

find the number of steel ball bearings, each of diametre 0.7 cm,that can be made from 1 kg of steel given that 1cm cube of steel weighs 7.85g

Answer 1

Step 1, the determine volume of the 1kg steel.

Answer 2

hello please answer

Answer 3

Step 1: The volume. We're doing it step by step. Right?

Answer 4

tell me the equaions

Answer 5

Alright. If you insist, I solve it for you.
Step 1: I take the volume of the steel ball.
The diameter is 0.7 cm, thus the radius is 0.35 cm.
The volume is given by( 4/3)*pi*r^3

Answer 6

where r is the radius.

Answer 7

step 2: I have the density, I multiply the density by the volume. That gives me mass of ONE small steel ball.

Answer 8

Step 3: I divide the mass of ONE steel ball by the total mass of steel I have, in this case, being 1 kg. I take the greatest integer function of it. THAT gives me the solution.

Answer 9

i dont understand

Answer 10

Did you try puttin in the values and following the procedure?

Answer 11

I mean, any kind of help is useless if you're not willing to give it a listen and expect the answer to just come to you.

Answer 12

i dont understand step 3

Answer 13

See, you got the mass by step 2. That is (assume) m.
Now, the value of m is in grams. Right?

Answer 14

please show me the equation i dont understand

Answer 15

Did you get the value of mass by step 2?

Answer 16

Please, cooperate if you want to understand.

Answer 17

1.40515

Answer 18

That's a value in grams. Now, What I did in step 3 is:-
1kg=1000 g of steel. That I have.
I divided it:-
1000g/mass of 1 ball.

Answer 19

then

Answer 20

That gives you a value. Which is the number of balls. I assume it comes in a decimal number?

Answer 21

no the answer is 790

Answer 22

709

Answer 23

brb, lost my calc.

Answer 24

Volume= 0.179 cm^3

Answer 25

step 2: mass comes as 1.409 g

Answer 26

step 3: 1000/1.409=709.312
I take the greatest integer function: 709

Answer 27

thanks

Answer 28

No problems, next time, please participate in problem solving. =)