A given coin has a mass of 3.0 g .Calculate the nuclear energy that would be required to separate all the neutrons and protons from each other. For simplicity assume that the coin is entirely made of `"_29^63Cu` atoms (of mass 62.92960 u).

Ten one-rupee coins are put on top of each other on a table. Each coin has a mass m Give the magnitude and direction of:- the force on the 7th coin (counted from the bottom) due to all the coins on its top,

Calculate the energy liberated in kWh, where 100 g of "_3Li^7 are converted into "_2He^4 by proton bombbardment. Given mass of "_3Li^7=7.0183 u , mass of "_2He^4=4.0040 u and mass of "_1H^1 = 1.0081 u .

Nuclei with magic no. of proton Z=2, 8,20,28,50,52 and magic no. of neutrons N=2,8,20,28,50,82 and 126 are found to be very stable. Verify this by the calculating the proton separation energy S_p for "^120Sn(Z=50) and "^121Sb=(Z=51) . The proton separation energy for a nuclide is the minimum energy required to separate the least rightly bound proton from a nucleus of that nuclide. It is given by S_p=(M_(z-1,N)+M_H-M_(Z,N))c^2 Given "^119ln=118.9058u , "^120Sn=119.902199u , "^121Sb=120.903824u , "^1H=1.0078252u .

Gasoline has an enthalpy of combustion 24000 kJ/mol gallon. When gasoline burns in an automobile engine, approximately 30% of the energy released is used to produce mechanical work. The remainder is lost as heat transfer to the engine's cooling system. As a start on estimating how much heat transfer is required, calculate what mass of water could be heated from 25^(@)C to 75^(@)C by the combustion of 1.0 gallon of gasoline in an automobile? (Given : C(H_(2)O)=4.18 J//g^(@)C ) a) 34.45 kg b) 80.383 kg c) 22 kg d) 224 kg

Iron has a body centred cubic unit cell with the cell dimension of 286.65 pm. Density of iron ·is 7.87 g cm^(-3) Use this information to calculate Avogadro's number. (Atomic mass of Fe= 56.0 u)

Two pith-balls each of mass 5xx10^-4 kg are suspended from the same point by silk threads 0.2 m long equal charges are given to the balls, which separate, until the threads enclose an angle of 30^@ , Calculate the charge on each pith-ball.

Estimate the average drift speed of conductin electrons in a copper wire of cross sectional area 1.0xx10^(-7) m^2 carrying a current of 1.5 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is 9.0xx10^3 kgm^(-3) and its atomic mass is 63.5 u.

Assuming that protons and neutrons have equal masses,calculate how many times nuclear matter is denser than water.Given that nuclear radius is given by R=1.2 xx 10 ^(-15) A^(1//3) metre and mass of a nucleon = 1.67 xx 10^(-27) kg .