42 kg 15 Dg = ? Dg

If the weights of 8 students are 30 kg, 32 kg, 25 kg 41 kg, 36 kg 40 kg, 28 and 20 kg find the mean weight for these students.

The ratio between the quantities 1.5 kg and 80 gms is -

A calorie is a unit of heat or energy and it equals about 4.2 j where 1 J = 1 kg . m^(2). S^(-2) . Suppose we employ a system of units in which the unit of mass equals alpha kg the unit of length equals beta m and the unit of time is lambda s. Show the a calorie has a magnitude 4.2 alpha^(-1) beta^(-2) gamma^(2) in terms of the new units.

Three blocks are connected as shown in on a horizontal frictionless table and pulled to the right with a force F = 60N. If m_(1) = 5 kg, m_(2) = 10 kg and m_(3) = 15 kg, Find the tension T_(1) and T_(2) .

An aromatic organic compound has the following composition by weight c = 77.42% H = 7.53% N = 15.05% The vapour density of the compound is 46.5. Find the molecular formula of the compound.

20.0 kg of N_2 (g) and 3.0 kg of H_2 (g) are mixed to produce NH_3 (g) formed is (1) 17 kg (2) 34 kg (3) 20 kg (4) 3 kg (5) 23 kg

The boiling point of a solution containing 1.5 g of dichlorobenzene in 100 g of benzene was higher by 0.268^@C . Calculate the molar mass of dichlorobenzene. K_b forbenzene = 2.42 K kg mol^-1

A boy of mass 20 kg , moved up to the top of a building of height 18 m , carrying a box of mass 2.5 kg. if he did this in 1.5 min, what was his rate of doing work ?

A sphere of mass 40 kg is alternated by another sphere of mass 15kg with a force of 1/(10) mg -wt . Find the value of G if the separation between the spheres is 20 cm.