A block of mass 4 kg is suspended from the ceiling with the help of a steel wire of radius 2mm and negligible mass. Find the stress in the wire. `(g=pi^(2))` (A) `4.0xx10^(6) N//m^(2)` (B) `3.14xx10^(6) N//m^(2)` (C) `3xx10^(5) N//m^(2)` (D) `2.0xx10^(6) N//m^(2)`

The adjacent graph shows the extra extension (Deltax) of a wire of length 1m suspended from the top of a roof at one end with an extera load Deltaw connected to the other end If the cross sectional area of the wire is 10^(-5)m^(2) calculate the Young's modulus of the meterial of the wire (A) 2 xx 10^(11) N//m^(2) (B) 2 xx 10^(-11)N//m^(2) (c) 3 xx 10^913) N//m^(3) (D) 2 xx 10^(16)N//m^(2) .

Find the greatest length of steel wire that can hang vertically without breaking. Breaking stress of steel =8.0xx10^(8) N//m^(2) . Density of steel =8.0xx10^(3) kg//m^(3) . Take g =10 m//s^(2) .

Hardness of water is 200 ppm. The normality and molarity of CaCO_3 in the water is (a). 2xx10^(-6)(N,2xx10^(-6)M (b). 4xx10^(-2)N,2xx10^(-2)M (c). 4xx10^(-3)N,2xx10^(-3)M (d). 4xx10^(-1)N,2xx10^(-1)M

A lift of mass 1000 kg is suspended by steel wire of maximum safe stress 1.4 xx 10^(8) N//m^(2) . Find the minimum diameter of the wire, if the maximum acceleration of the lift is 1.2 ms^(-2)

(a) A wire 4 m long and 0.3 mm, calculate the potential energy stored in the wire. Young's modulus for the material of wire is 2.0xx10^(11) N//m^(2) .

The density of the material of a wire used in sonometer is 75xx10^(-2) kg //m^(3) . If the stress on the wire is 3.0xx10^(4) N//m^(2) , the speed of transverse wave in the wire will be

A body of mass 3.14 kg is suspended from one end of a wire of length 10 m . The radius of cross-section of the wire is changing uniformly from 5xx10^(-4) m at the top (i.e. point of suspension) to 9.8xx10^(-4) m at the bottom . Young's modulus of elasticity is 2xx10^(11) N//m^(2) . The change in length of the wire is

Given Y = 2 xx 10^(11)N//m^(2), rho = 10^(4) kg//m^(3) Find out elongation in rod.

Consider a wire of length 0.1 m with an area fo cross section 1 mm^2 connected to 5V. Find the current flowing through the metallic wire where mu = 5xx10^(-6) m^2 V_1 s^(-1), e = 1.6xx10^(-19) C, and n = 8xx10^(28) m^(-3).

A steel wire 2mm in diameter is just stretched between two rigid walls at 20°C. If the temperature falls to 10°C, find the tension in the wire. Linear coefficient of expansion of steel = 11 xx 10^(-6)//k and Y = 2 xx10^(11) N//m^(2)