RP5 - Density - Part 1: Calculating the density of a regularly shaped object.

Question 1

Outline the basic steps of the practical.

Answer 1

1. Measure the dimensions of the regular shape and calculate the volume
2. Measure the mass of the shape using a calibrated balance
3. Calculate density from the mass and volume

Question 2

Give the formula for the volume of a prism

Answer 2

Volume = area of face x height

Question 3

What equation is used to calculate volume of a rectangular prism?

Answer 3

Volume = Length x Width x Height (this also applies to cubes)

Question 4

Give the formula for the volume of a sphere

Answer 4

Volume = 4/3 x 𝜋 x radius3 V = 4/3𝜋r3

Question 5

What equation is used to calculate density?

Answer 5

Density = Mass / Volume OR p=mv

Denisty = P, Mass = M, Volume = V

Question 6

What unit is used for density?

Answer 6

kg/m^3

Question 7

What piece of equipment is used to measure the object’s mass? What must you do before using it?

Answer 7

A digital balance, which should be zeroed before placing the object on it to avoid a zero error.

Question 8

How do you convert from g/cm^3 to kg/m^3?

Answer 8

Multiply the value by 1000.