The young�s modulus for steel is 20.7*1010 n/m2. how much will a 2.5 mm diameter wire 12 cm long, be strained when it supports a load of 450 n?

ΔL = 53.14*10⁻⁶ m

Explanation:

Given

E = 20.7*10¹⁰ N/m²

D = 2.5 mm = 2.5*10⁻³ m

L = 12 cm = 0.12 m

P = 450 N

ΔL = ?

We can use the formula

ΔL = P*L / (A*E)

where    A = π*D² / 4 = π*(2.5*10⁻³ m)² / 4

⇒   A = 4.908*10⁻⁶ m²

then

ΔL = (450 N)*(0.12 m) / (4.908*10⁻⁶ m²*20.7*10¹⁰ N/m²) = 53.14*10⁻⁶ m

found in the nucleus

has mass of one amu

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.