Density, Dimensional Analysis, & Significant Figures

Question 1

What is density?

Answer 1

Density is the comparison of how much matter there us in a certain amount of space.

Question 2

What is the Density Formula and Triangle?

Answer 2

density = mass/volume triangle= mass- top & Density - left bottom & Volume - right bottom

Question 3

When would you use the displacement method?

Answer 3

It is used for accurately measuring the volume go an odd shape.

Question 4

What are the steps of the displacement method?

Answer 4

1. Partially fill your graduated cylinder with water. (note the initial volume)
2. Gently insert the object into the cylinder ( note the final volume)
3. Calculate the change in volume

Question 5

Dimensional Analysis #1
Question: A weightlifter can lift 495lbs. How many kg is that? 1kg = 2.2 lbs

Answer 5

Answer: 495lbs (1kg/ 2.2lbs) = 495/2.2 = 225 kg

Question 6

Dimensional Analysis #2
Question: If a space shuttle can travel 17,000 miles per hour, how many meters can it travel per second.

Answer 6

Answer: (17000 miles/1hr) (1.609km/1mile) (1000m/1km) (1hr/60min) (1min/60sec) = 7.6 x 10 3rd m/s

Question 7

What are the steps to finding the significant figure?

Answer 7

1. count all integers not including zeros
2. count all zeros that occur between integers
3. Leading zeros are not significant
4. only count if the is a decimal next to the trailing zeros

Question 8

Significant Figure #1
Question: 0.002000

Answer 8

Answer: 4

Question 9

Significant Figure #2
Question: 800

Answer 9

Answer: 1