Answer:
a
Explanation:
The most reasonable conclusion of the above phenomenon is that water is a poor conductor of heat. Basically water is an insulator. The heat from surface to the bottom of the beaker will take a lot of time. Moreover, no convection current is formed so, heat might not even reach the bottom surface. Hydrogen bonding also play a vital role in determining the thermal properties of water.
hence option A is correct
Answer:
The speed of the man is 4.54 m/s.
Explanation:
Given that,
Mass of man=8100 g
Mass of stone = 79 g
Speed = 4.5 m/s
We need to calculate the speed of the man
Using momentum of conservation
Where,
=mass of man
=mass of stone
=velocity of man
=velocity of stone
Put the value in the equation
As the stone is away from the man
So, the speed of stone is zero
Hence, The speed of the man is 4.54 m/s.
Use v^2 = u^2 + 2 a s
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Answer:
Lithium
Explanation:
It is the only one part of the Alkali Metals which are the most reactive in the periodic table
<span>Scanning electron microscopes</span><span><span /> allow scientists to find the shape and surface texture of small objects. The microscopes slide a beam of electrons across the surface of something, and it </span><span><span>produces a detailed map of the surface of the object.</span> </span>