Explanation

 A · A = |A||A|cos(0) = A² (since cos 0 = 1)  

   - This gives the magnitude squared of the vector.  

Explanation

 Alkali metals are found in Group 1 of the periodic table.

Potassium (K) is located in Group 1, making it an alkali metal. 

Explanation

Stress is defined as force per unit area:

Stress=Force/ Area ​

• The dimensions of force = MLT²

• The dimensions of area = L²

So:

Dimensions of Stress=MLT⁻²/ L⁻²−2​=ML⁻¹T⁻²

Explanation

The correct proverb is: "A bird in hand is worth two in the bush."

It means it's better to hold onto something certain than risk it for more uncertain gain.

Explanation

Mass is converted into energy (or vice versa), following Einstein’s equation: E=mc^2

Explanation

The perianth is the outer part of the flower, made up of the calyx (sepals) and corolla (petals).

It protects the inner reproductive parts.

It may also help attract pollinators.

Explanation

ENTIRELY مکمل طور پر

Completely مکمل طور پر

Explanation

The temperature of body is controlled by Hypothalamus gland.

The hypothalamus is a small region of the brain.

Explanation

Explanation