Explanation

The mass of Earth is approximately 6.0 x 10^24 kilograms (5.98 x 10^24 kg).

This is a widely accepted scientific value, based on various measurements and calculations, including:

• Gravity measurements
• Satellite orbits
• Seismological data
• Planetary formation models

Explanation

Explanation

The hertz is the unit of frequency of one cycle per second. 

 symbol: hertz (Hz)

Hertz in honor of the German physicist Heinrich Hertz

hertz in the International System of Units (SI)

frequency is defined as one cycle per second

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Explanation

Explanation

π (pi) is approximately 3.14159.

The value of Pi (π) is the ratio of the circumference of a circle to its diameter.

Explanation

Boyle’s Law describes the inverse relationship between the pressure (P) and volume (V) of a given mass of gas at constant temperature (isothermal conditions):

P ∝ 1/V or PV = constant

Key Points:

• Conditions: Fixed mass and temperature (no chemical reactions).
• Example: Compressing a syringe (volume ↓ → pressure ↑).

Explanation

The cell is the smallest unit of life.

Cells are called ‘structural’ and ‘functional’ units for a reason.

Cells are made of molecules which are in turn made up of atoms.

“Cell is the unit of LIFE” is that a cell is the smallest living entity in a living system.

Explanation

Christopher Columbus born 1451, Italy

Died May 20, 1506, Valladolid, Spain

Master navigator and admiral whose four transatlantic voyages opened the way for European

Explanation

The cosine of π radians (or 180 degrees) is -1.

Explanation

The union of two sets A and B, denoted as A ∪ B, is the set of all elements that are in A, in B, or in both.

A = {𝑐, 𝑑, 𝑏, ℎ} and B = {𝑚, 𝑝, 𝑓, ℎ}

A ∪ B = {𝑐, 𝑑, 𝑏, ℎ, 𝑚, 𝑝, 𝑓}