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In Searle’s apparatus for measurement of Young’s modulus, a steel wire of length 2m and

area of cross-section 6 2 2.5 10^-6 m^2 − × is suspended from a torsion head. When a weight of

5 kg is suspended at its free-end, its length increases. Calculate the work done on the

wire. Take Young’s modulus of steel as 2 10^11 Nm .

area of cross-section 6 2 2.5 10^-6 m^2 − × is suspended from a torsion head. When a weight of

5 kg is suspended at its free-end, its length increases. Calculate the work done on the

wire. Take Young’s modulus of steel as 2 10^11 Nm .

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A Carnot engine has an efficiency of 0.5 while working between a source at 400K and a sink at TK. The temperatures of both the source and the sink are changed. Calculate the efficiencies of the engine when temperatures are (a) increased by 100°C and (b) decreased by 100°C. Interpret your result physically.

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A hill that has a 12.0% grade is one that rises 12.0 m vertically for every 100.0 m of distance in the horizontal direction. At what angle is such hill inclined above the horizontal

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A 0.5kg piece of metal (c = 600/kgk) at 300 degreees celsius is dumped into a large pool of water at 20 degree celsius. Assuming the change in temperature of water to be negligible, calculate the overall change in enthropy for the system.

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if a charged particle goes unaccelerated in a region containing electric and magnetic field,

a)E must be perpendicular to B

b)velocity must be perpendicular to E

c)velocity must be perpendicular to B

d)E must be equal to vB

explain?

a)E must be perpendicular to B

b)velocity must be perpendicular to E

c)velocity must be perpendicular to B

d)E must be equal to vB

explain?

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the net charge in a current carrying wire is zero . then why does a magnetic field exert a force on it

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the free electrons in a conducting wire are in constant thermal motion. if such a wire carrying no current is placed in a magnetic field ,is there any magnetic force on each free electrons ?

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If the function psi1 & psi2 are solution of Schrödinger wave equation for a particle , then prove that a1psi1+a2psi2 is also a solution of same equation, where a1 & a2 are arbitrary constants.

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0.7. A transverse wave produced on a spring has a frequency of 190 Hz and travels along the length of the spring of 90 m, in 0.5 s.

(a) What is the period of the wave?

(b) What is the speed of the wave?

(c) What is the wavelength of the wave?

(a) What is the period of the wave?

(b) What is the speed of the wave?

(c) What is the wavelength of the wave?

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if water is falling from a nul drop after drop. 1st drop has fallen on ground while 3rd drop is near to fall while 2nd drop is between somewhere distance between 1st and 3rd drop is 5 meter. What is distance between 2nd and 3rd drop?

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