Y = mgL/Ae , e=α L δ t =>m=3.14
9) Steel wire of length ’L’ at 40?C is suspended from the ceilling and then a mass ’m’ is hung from its free end. The wire is cooled down from 40?C to 30?C to regain its original length ’?L’. The coefficient of liner thermal expansion of the steel is 10’?5/?C, Young’s modulus of steel is 1011 N/m2 and radius of the wire is 1mm. Assume that L>> diameter of the wire. Then the value of ’?m’ in kg is nearly
Answer is:
3
Explanation:
Related General Physics MCQ with Answers
Answer is:
1
Explanation:
1010 = N*1/109
=>N = 1019
=>total mass = 10-25*1019 = 1mg
Answer is:
9
Explanation:
I = (4*2*MR2/5) + Ma2/2
=>N11*10-4
=> N=9
Answer is:
collision between fast neutrons and nitrogen nuclei present in the atmosphere
Explanation:
Fast moving neutron have a sufficient energy to penetrate the nitrogen nucleus and absorbedby it. Hence it make a intermdiate unstable element finallyit gives carbon-14 and a electron.
Answer is:
work done in rolling a stone is less than in lifting it
Explanation:
Work done in rolling is less than lifting due to a extra work has been done in lifting due to gravity means against the gravity but in rolling on a inclined plane we get a work done by gravity in downward direction along the gravity.