Mechanics | Relativity Answers

Steel wire rope is used to lift a heavy object. We use a 3.1m steel wire that is 6.0mm in diameter and lift a 1.7x103 kg object. Then, the wire elongates 0.17m. Calculate the Young’s modulus for the rope material.

Two people carry a heavy object by placing it on a uniform board that is 2.00m long and weighs 2.00x102 N. One person lifts at one end with a force of 4.00x102 N, and the other lifts the opposites end with a force of 6.00x102 N. Find the weight and the location of the heavy object. 

A uniform board that is 1.50m long and weighs 3.50x10^2 N is suspended horizontally by two vertical cables at each end. Cable A can support a maximum tension of 5.00x10^2 N without breaking, and cable B can support up to 4.00x10^2 N. You want to place a small weight on this bar. Find the heaviest weight you can put on without breaking either cable and its location.

Compton shift in wavelength is zero scattering angle of photon is:

a= 90

b=180

c=0

d=45

A Four bar chain ABCD has a fixed link AD = 700mm, the driving crank AB= 200mm, the driven crank CD = 400mm and the connecting link BC=900mm. Find the velocity and acceleration of Point ‘P’ midway between B and C when the angle BAD = 60⁰ and AB rotates anticlockwise at a uniform speed of 600 rpm.

A body slides down a rough inclined plane of angle 30° to the horizontal.find the distance covered after 15s from rest, assuming g=9.8m/s²

A particle in a central field moves in the spiral orbit 𝑟 = 𝑐𝜃3

• Two vertically suspended wires are parallel to each other and are also 500 mm apart. The load P carried is W. The first wire is made out of copper and has a diameter of 4 mm. The second wire is made out of steel and has a diameter of 3 mm. The Young's Modulus of Elasticity is 100 GPa for copper and 200 GPa for steel. If the elongation is the same in both wires, calculate the position of W. A. 0.25 m
•  B. 0.27 m
•  C. 0.24 m
•  D. 0.26 m

An object of mass 2.0kg falls freely from a height 100meter into a muddy ground and comes to rest in the middle calculate the distance the body penetrate if the average retarding force is 20,000newton