Given: A positive number in 5 times another number To Do: Find the numbers if 21 is added to both the numbers Solution: Let another number by $y$Given positive number = $5y$Given $5y + 21 = 2(y+21)$$ 5y + 21 = 2y + 42$ or$ 5y - 2y = ... Read More

Hand span : Distance between extremities of a stretched palm. Cubit : Distance from elbow to tip of the middle finger. Foot : Length of the foot. Yard : Distance from chin to fingertips when the arm is outstretched.  

Prime Numbers:Numbers that have only two factors (are perfectly divisible by only two numbers) i.e. one and itself.For example, 5 is a prime number as 5 has only two factors, 1 and 5. 2, 3, 5, 7, 11, 13, 17....and so on. Composite numbers are those numbers that are NOT ... Read More

An occupational hazard is the risk associated with the particular occupation and accepted as a consequence. For example, The people working in the asbestos industries and mining develop the risk of suffering from asbestosis. Occupational hazards include various types of hazards such as chemical hazard, biological hazard, psychosocial hazard, and ... Read More

Given : The given absolute value of a number is $\frac{5}{6}$. To do : We have to find the number. Solution : The absolute value of a number is represented in the form as |x|. It represents the distance between x and 0 on the number line. The ... Read More

Law of conservation of momentum states that:For two or more bodies in an isolated system acting upon each other, their total momentum remains constant unless anan external force is applied.Therefore, momentum cannot be changed without an external force.

Physical change is the change of that matter where only appearance or molecular arrangement of matter changes without changing its composition.Examples: Boiling and freezing of water, melting of wax, mixing sand and grains, crumpling a paper bag, chopping a wood etc.Properties of physical change are as follows:• Most of the ... Read More

AtmosphereThe term Atmosphere derived from the Greek word, atmos meaning vapour and sphaira meaning sphere or region.It is the blanket of gases commonly known as air, which surrounds Earth. The atmosphere is very important to us, as it protects Earth by absorbing the harmful solar radiation and regulating heat ... Read More

The unit of time in the SI units is seconds. 

Yes, solids diffuse into liquids. The spreading and mixing out of a substance into another substance because of the movement of its particles is called diffusion.  For example, sugar or salt diffuses in water. The molecules of sugar or salt dissolve in water.