+91-8076753736[email protected]
logo
logo
-->

Atoms And Molecules

Question
CBSEENSC9006101
Wired Faculty App

Suppose that the two giant planets of the solar system, Jupiter and Saturn, are in the same line as seen from the earth. It happens occasionally that some planets appear in the same line from the earth. Find the total gravitational force due to them on a person of mass 50 kg on the earth. Compare this with the force of gravity on the same person. Could the force due to planets be important?

Solution

The given question has been illustrated in the figure below. 


straight F subscript total space equals space straight F subscript saturn minus 50 end subscript space plus space straight F subscript Jupiter minus 50 end subscript equals space fraction numerator straight G.50 space cross times space 6 cross times 10 to the power of 26 over denominator left parenthesis 12.8 cross times 10 to the power of 11 space minus space 6.4 cross times 10 to the power of 6 right parenthesis squared end fraction plus fraction numerator straight G.50 cross times 2 cross times 10 to the power of 27 over denominator left parenthesis 6.3 cross times 10 to the power of 11 minus 6.4 cross times 10 to the power of 6 right parenthesis squared end fraction equals space 6.67 cross times 10 to the power of negative 11 end exponent open square brackets fraction numerator 3 cross times 10 to the power of 28 minus 22 end exponent over denominator 12.8 cross times 12.8 end fraction plus fraction numerator 1 cross times 10 to the power of 29 minus 22 end exponent over denominator 6.3 cross times 6.3 end fraction close square brackets equals space 6.67 cross times 10 to the power of negative 11 end exponent left square bracket 0.27 cross times 10 to the power of 6 right square bracket equals space 1.8 space cross times space 10 to the power of negative 5 end exponent space straight N So comma space the space force space of space gravity space on space 50 space kg space almost equal to space 50 space cross times 9.8 space straight N space equals space 490 space straight N  
The force due to planets, is very small and hence is negligible. 

Some More Questions From Atoms And Molecules Chapter

When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of oxygen ? Which law of chemical combination will govern your answer?

What are polyatomic ions? Give examples.

Write the chemical formulae of the following:

(a) Magnesium chloride
(b) Calcium oxide
(c) Copper nitrate 
(d) Aluminium chloride
(e) Calcium carbonate

Give the names of the elements in the following compounds.

(a) Quick lime
(b) Hydrogen bromide
(c) Baking powder 
(d) Potassium sulphate.

Calculate the molar mass of the following substances:

(a) Ethylene
(b) Sulphur molecule, S8
(c) Phosphorus molecule, P4
(d) Hydrochloric acid, HCl
(e) Nitric acid, HNO3.

What is the mass of:

(a) 1 mole of nitrogen atoms

(b) 4 moles of aluminium atoms

(c) 10 moles of sodium sulphite.

Convert into mole

(a) 12 gm of oxygen gas

(b) 20 gm of water

(c) 22 gm of carbon dioxide.

What is the mass of?

(a) 0.2 mole oxygen atoms.

(b) 0.5 mole of water molecules.

Calculate the number of molecules of sulphur (S8) present in 16 gm of solid sulphur.

Calculate the number of aluminium ions present in 0.56 gm of aluminium oxide.

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation