What is the mass of Earth? Name the nearest galaxy to the Milky Way Galaxy.
The mass of Earth’s is 5.9722 x 1024 kg.
At present, the "Canis Major Dwarf" galaxy is the closet known galaxy to the Milky Way. This stellar formation is about 42,000 light-years from the galactic centre (centre of the milky way) and merely 25,000 light-years (7.7 kiloparsecs) away from our Solar System. It’s the most distant thing you can see with the eye alone.
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- Express the number appearing in the following statements in standard form.$(a)$ The distance between Earth and Moon is $384,000,000\ m$.$(b)$ Speed of light in vacuum is $300,000,000\ m/s$.$(c)$ Diameter of the Earth is $1,27,56,000\ m$.$(d)$ Diameter of the Sun is $1,400,000,000\ m$.$(e)$ In a galaxy there are on an average $100,000,000,000$ stars.$(f)$ The universe is estimated to be about $12,000,000,000$ years old.$(g)$ The distance of the Sun from the centre of the Milky Way Galaxy is estimated to be $300,000,000,000,000,000,000\ m$.$(h)$. $60,230,000,000,000,000,000,000$ molecules are contained in a drop of water weighing $1.8\ gm$.$(i)$. The earth has $1,353,000,000\ cubic\ km$ of sea water.$(j)$. The population of India was about $1,027,000,000$ in March, 2001.
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- The distance of a Galaxy from the Earth is $5.6 \times 10^{25}$m Assuming the speed of light to be $3 \times 10^8$ m/s, find the time taken by the light travel the distance.
- If the mass of the moon is 1/100 th the mass of the earth and the radius of moon is 1/4th to the radius of earth , what is the ratio of acceleration due to gravity on earth to that on the moon?
- The mass of the body on earth is $60\ kg$, what is its weight on the earth and on moon.
- What is the weight of a body on earth whose mass is 25 kg?
- What is the weight of a $1\ kilogram$ mass on the earth? $(g=9.8\ m/s^2)$.
- What is the force of gravity on a body of mass $150\ kg$ lying on the surface of the earth? (Mass of earth $=6\times10^{24}\ kg$; Radius of earth $=6.4\times10^{6}\ m$; $G=6.7\times10^{-11}\ Nm^2kg^{-2}$)
- What is the magnitude of the gravitational force between the earth and a $1\ kg$ object on its surface? Mass of the earth is $6\times10^{24}\ kg$ and radius of the earth is $6.4\times 10^6\ m$.
- What name is given to the heat energy obtained from hot rocks inside the earth?
- The value of quantity $G$ in the formula for gravitational force:(a) depends on mass of the earth only (b) depends on the radius of earth only(c) depends on both mass and radius of earth (d) depends neither on mass nor on radius of earth
- Name the sources of freshwater available on the Earth.
- Convert the following number into the standard form: The nearest star to the earth is 14,96,00,000 Km away from the Sun.
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