## Search found 14 matches

- November 13th, 2020, 8:15 am
- Forum: Question Marathons
- Topic: Density Lab B
- Replies:
**28** - Views:
**1125**

### Re: Density Lab B

1. I got about 3.87: 8.7 x 10^5 micrometers = .87 meters .87/2 = .435 (radius) .435^3 = about .0823 .0823(pi) = about .259 The volume of the sphere is about .259 cubic meters Therefore it is about 259,000 mL The mass of the ball is 1 kg Therefore it is 1,000,000 mg 1,000,000/259,000 = about 3.86, b...

- November 10th, 2020, 8:26 am
- Forum: Question Marathons
- Topic: Density Lab B
- Replies:
**28** - Views:
**1125**

### Re: Density Lab B

1. A ball with diameter 8.7 x 10^5 micrometers has a mass of 1 kg. What is its density in mg/mL? 2. A weight made of lead is tied to a scale which reads 5 kg. When the weight is completely submerged in water, the scale reads 4.559 kg. What is the volume of the weight in cubic cm? 3. An iceberg (0.91...

- October 28th, 2020, 7:32 am
- Forum: Question Marathons
- Topic: Density Lab B
- Replies:
**28** - Views:
**1125**

### Re: Density Lab B

Yeah on 2 I divided by 10000 instead of multiplying when converting to meters squared. On #4 I probably forgot that a square meter is 10000 square cm rather than 1000.

- October 27th, 2020, 7:57 am
- Forum: Question Marathons
- Topic: Density Lab B
- Replies:
**28** - Views:
**1125**

### Re: Density Lab B

1. 1530 (3 sig figs) 2. (I’m not sure on this one) 0.0001819275 3. 1.0638715631 4. 0.0001094034

- October 15th, 2020, 10:40 am
- Forum: Question Marathons
- Topic: Density Lab B
- Replies:
**28** - Views:
**1125**

### Re: Density Lab B

On #2 do the objects take up the entire tray? On #4 I don’t think you can calculate the impact force without the height the tennis ball falls from. On #4 To my understanding of pressure, we can’t figure out the pressure of the tennis ball on the court without knowing how much of the tennis ball tou...

- October 14th, 2020, 8:08 am
- Forum: Question Marathons
- Topic: Density Lab B
- Replies:
**28** - Views:
**1125**

### Re: Density Lab B

Those are all correct! I was just a little confused when no one answered my questions after four days since usually it takes one or two days for an answer.

- October 13th, 2020, 8:41 am
- Forum: Question Marathons
- Topic: Density Lab B
- Replies:
**28** - Views:
**1125**

### Re: Density Lab B

If nobody is going to answer by the 16th, I will answer them myself.

- October 9th, 2020, 11:41 am
- Forum: Question Marathons
- Topic: Density Lab B
- Replies:
**28** - Views:
**1125**

### Re: Density Lab B

I guess I will go then. 1) A ball of an unknown material has a density of 16.3g/cm^3. It is placed in a bowl of water and the volume of the water goes up from 400mL to 800mL. What is the mass of the ball? 2) What is Gay Lussac’s Law? Provide an example question with an answer. 3) The pressure exerte...

- October 8th, 2020, 6:35 pm
- Forum: Question Marathons
- Topic: Density Lab B
- Replies:
**28** - Views:
**1125**

### Re: Density Lab B

Here’s my work for 1 and 3. Correct me if I am wrong: 1: 70 picometers = 7e^-11 Volume of a sphere = 4/3(pi)(r 4/3(pi)(3.43e^-31) = approximately 1.436755e^30 That is the volume of one atom. 1.436755e^-30(3.50)(10^6) = 5.0286426e^-24 I recalculated and got 5.0286426e^-24. I guess I forgot to cube th...

- October 8th, 2020, 10:13 am
- Forum: Question Marathons
- Topic: Density Lab B
- Replies:
**28** - Views:
**1125**

### Re: Density Lab B

```
1. Assuming the atom is a perfect sphere: 0.0010262536 m3 5.0286426e^-24
2. 100,000,000 ppb
3. 46550 cm3
```