The mass of a box measured by a grocer's balance is 2.3kg.Two gold pieces of masses 20.15 g and 20.17 g are added to the box .What is :
the total mass of the box

. 3.7 g of a gas at 25^@C occupied the same volume as 0.184 g of hydrogen at 17^@C and at the same pressure. What is the molar mass of the gas ?

A block of wood of mass 10 kg is suspended with a long rope. A bullet of mass 50 g moving at 0.3 km *s^(-1) hits and gets embedded in that block . What will be the vertical rise of the block ? [g=980 cm *s^(-2) ]

2.49 xx 10^-18 g of an element. A contains 2.0 xx 10^4 atoms. What is, the atomic mass of the element A?

20 g of NaOH is present in 250 mL of H_(2) O . Calculate the active mass of the solution .

Three particles of masses 1 g, 2g, and 3g are placed at the vertices of an equilateral triangle of side 1 m. Locate the centre of mass of the system.

Two substances A and B are of equal masses and their molecular masses are in the proportions of 2:3. what is the ratio of the numbers of their molecules?

From the two arms of a beam balance, a metal body weighing 20 g and a piece of glass are suspended. The apparent weights of these two bodies when measured in water are found to be the same. If immersed in alcohol instead of water, the mass of the metal needs to be increased by 0.84 g for balancing the beam. Calculate the mass of the glass piece. [Given, density of water = 1g*cm^(-3) , density of alcohol = 0.96g*cm^(-3) ]

A circular ring of mass 20 g is rotating about its own axis with an angular velocity of 30 rpm. Two bodies of equal masses are placed simultaneously at the two extreme points along its diameter. Mass of each of these two bodies is 5 g. In this situation what will be the angular velocity of the system?