Name: Date: .

1. WorkSheet

2. It is estimated that light takes 100,000 years to travel the full distance across our galaxy. If light travels at 3.0 x 108m in one second, how long is the Milky Way? Give your answer in standard form (M1)

3. A block cut from asteroid rock was measured to have dimensions: 133mm x 12.4mm x 15.2mm

a) Convert the dimensions into SI units (P1)

b) Find the volume of the block. Give your answer in standard form and to the appropriate number of significant figures (P1, M1)

4. You are working as a clinical chemist in charge of the testing of blood samples. You are required to mix a sodium chloride solution with water in the ratio of 2:5

a) Starting with 780ml of the sodium chloride solution, how much water needs to be added? (D1)

b) Give your answer in standard form to an appropriate number of significant figures (M1)

5. You are a geologist assigned to estimate the density of the Earth. You know that density is given by: p = [pic]. You need to first find the volume (v) of the Earth, which can be found by the equation:

V = [pic] л x R3. The radius of the Earth (R) can be found by using the equation g = [pic]. You are given the following values:

• G = 6.67 x 10-11Nm2kg-2

• M = 5.97 x 1024kg

• g = 9.81ms-2

a) calculate the radius of the Earth and then the volume of the Earth (P2, M2, D2)

b) use your answer from part a to determine the density of the Earth. Give your answer in standard form to the appropriate number of significant figures (D2)

6) You are working at the National Blood Service Clinical Studies Unit.