A plant virus is found to consists of uniform cylindrical particles of 150A in diameter and 5000A long. The specific volume of the virus Is `0.75 cm^3//g` If the virus is considered to be a single particle, find its molecular mass.

A plant virus is found to consist of uniform cylinderical particles whose diameters is 150 Å and length is 5000 Å. The specific volume of the virus is 0.75 cm^(3)//g . If the virus is considered to be a single particle, then find its molecular mass.

A iron pillar consists of a cylindrical portion of 2.8 m height and 20 cm in diameter and a cone of 42 cm height sumounting it. Find the weight of the pillar if 1 cm^3 of iron weights 7.5 g.

A non-conducting disc of radius a with uniform positive surface charge density sigma is placed on the ground with its axis vertical. A particle of mass m and positive charge q is dropped along the axis of the disc from a height H with zero initial velocity. Charge per unit mass of the particle is q/m = (4 epsilon_0 g)/(sigma) . (i) Find the value of H if the particle just reaches the disc.

A non-conducting disc of radius a with uniform positive surface charge density sigma is placed on the ground with its axis vertical. A particle of mass m and positive charge q is dropped along the axis of the disc from a height H with zero initial velocity. Charge per unit mass of the particle is q/m = (4 epsilon_0 g)/(sigma) . (ii) Find the height for its equilibrium position.

The upper end of a 100 cm long uniform wire is rigidly fixed. At the other end, a spherical body of mass 40 g and diameter 2 cm is suspended. Mass per unit length of the wire is 0.008 g . cm^(-1) . Find the position of the centre of gravity of the system.

Specific volume of a cylinderical virus particle is 6.02xx10^(-2)"cc"*g^(-1) whose radius and length are 7 Å & 10 Å respectively. Molecular mass (kg*mol^(-1)) of the virus-

Define centre of mass..Write down its mathematical form. Two particles of masses 2g and 3g are situated at.the positions (2cm.3cm) and (4cm, 5 cm) respectively. Find the position vector o'f the centre of mass of the two particles.

A sphere of mass 266.5 g and of diameter 7 cm floats on a liquid. When the liquid is heated to 35^(@)C the sphere starts sinking in the liquid. If the density of the liquid at 0^(@)C " is " 1.527g*cm^(-3) , find its coefficient of volume expansion. Neglect the expansion of the sphere.