1.1 Measurements in Physics

   90 000 GW = ____________ mW

    45.1 hF = _____________ fF

   0.60 pm = _____________ km

214 minutes = _____________ ms

[4]

A sheet of silver has a thickness of 0.671 µm. A silver atom has a radius of 172 pm.

Tensile stress (σ) is defined as the force applied per unit cross-sectional area on a material. The tensile strength is the maximum amount of tensile stress a material can be subjected to before fracturing, meaning that it is equivalent to the tensile stress at the breaking point.

The humerus bone is approximately cylindrical and has a tensile strength of 0.17 GPa and a diameter of 20 mm.

The femur bone is the strongest bone in the body. It has a tensile strength of 0.135 kN mm^–2.

1 u is the atomic mass unit and a common unit used in nuclear physics.

The cross-sectional area of nuclei are commonly measured in the units barn, which are represented by the symbol b. 1 barn = 100 fm²