Answer:
Y = 2.286 *
) N/m
V = 436.46 m/s
Step-by-step explanation:
Length, L= 1.2 m
Radius, R=3.8 mm=3.8*

mass, m = 22 kg
Extension, ΔL = 2.5 mm
(a)
Forces P= mg =22*9.8 =215.6 N
Stress = P/A
= 215.6/[(
(r)²]
Stress = ( 215.6 ) / [(3.14* (3.18*
)²]
Stress= 4.755 *
N/m²
Strain in rod = ΔL/L = (2.5 *
)/(1.2)
=(2.08 *
)
Now, Toung midulus =Y= Stress/ Strain
=(4.755 *
)/(2.08 *
)
=(2.286 *
) N/m
(b)
Density of metal = 12 g/

= 12*10³ kg/m
Speed of sound in the metal=
v=

V=436.46 m/s