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Mars2501 [29]
3 years ago
15

What is time and it si unit​

Physics
2 answers:
faust18 [17]3 years ago
5 0

Answer:

Time: The concept of time is self-evident. An hour consists of a certain number of minutes, a day of hours and a year of days. Time is represented through change, such as the circular motion of the moon around Earth. The passing of time is indeed closely connected to the concept of space.

The SI unit for time is second: The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the cesium frequency ΔνCs, the unperturbed ground-state hyperfine transition frequency of the cesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s-1.

stich3 [128]3 years ago
3 0

Answer:

the duration between any two events is called time. It's si unit is second.

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5 0
3 years ago
Calculate the work against gravity required to build the right circular cone of height 4 m and base of radius 1.2 m out of a lig
Nana76 [90]

Answer:

Work done = 35467.278 J

Explanation:

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Height of the cone = 4m

radius (r) of the cone = 1.2m

Density of the cone = 600kg/m³

Acceleration due to gravity, g = 9.8 m/s²

Now,

The total mass of the cone (m) = Density of the cone × volume of the cone

Volume of the cone = \frac{1}{3}\pi r^2 h

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The center of mass for the cone lies at the \frac{1}{4}times the total height

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center of mass lies at,  h' = \frac{1}{4}\times4=1m

Now, the work gone (W) against gravity is given as:

W = mgh'

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4 0
3 years ago
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