Area = 6.16 m^2
 x r^2 = 6.16
r^2 = 616 / 100 x 7 / 22
r^2 = 196 / 100
r = 14 / 10
r = 1.4 m

Circumference = 2 x  x r
                        = 2 x 22/7 x 1.4
                        = 8.8 m

Distance = 572 m

Number of revolutions = Distance / Circumference
 made by the wheel     = 572 / 8.8 
                                     = 65

Therefore, the wheel makes 65 revolutions to cover 572 meter.

(i) The first group elements have a common valency of 1 and the valency of oxygen is 2 and to satisfy the combining capacity of oxygen, 2 elements of first group are required. Thus the oxide of the first group elements have the common formula of M₂​O.

Ex- Na₂​O,K_2​O,etc.

(ii) The valency of group 13 elements is 1 and the valency of oxygen is 2 and to satisfy the combining capacity of group 13 elements, 3 of halogens are required. Thus the molecular formula will be of form MX₃​.

Ex- AlCl_3​,BF₃​,etc.

(iii) The valency of group 2 elements is 2 and that of group 17 is 1. Thus two elements of group 17 are required to combine with group 2 element.

Ex- MCl₂​,CaCl_2​,etc.

Therefore we can write the formula as follows:

By squaring on both sides we get:

Therefore, the value of p is +4 or -4

Store Incharge                                                                                                                Chanakya Public School                                                                                                                   Keshpur                                                                                                                           Kolkata

11th August 2019

The Manager                                                                                                                   Premier Taders and Co.                                                                                                      Keshpur                                                                                                                            Kolkata

Subject: Placement of order for stationery articles

Respected Madam

I am Naveen Kumar, the Store In-Charge of Chanakya Public School, Kolkata. I want to place an order for a shipment of stationery articles for the school. Kindly find the list of articles below.

(Draw a table here)

Sno             Article             Description        Quantity

1                 Pencils              HB, Doms            100

Please ensure that all the items are new and must reach the school in proper shape. The shipment must be delivered before the 25th of August, 2019. Damaged items will be sent back at your own cost. Please ensure that the bill is sent and the amount will be paid to the delivery person by cheque only. In case of any queries, feel free to contact the school office.

Yours Truly

Naveen Kumar

Store In-Charge

When ferrous sulphate is heated colour changes from light green to reddish brown. On further heating, ferrous sulphate decomposes to form ferric oxide (Fe2O3), sulphur dioxide (SO2) and sulphur trioxide (SO3).

We know that the general form of quadratic equation is ax²+bx+c=0.

The given equation is (x+2)³=2x(x²−1) can be simplified as follows: 

(x+2)³ = 2x(x²−1)
⇒x³+2³+(3×x×2)( x+2)=2x³−2x (∵(a+b)³=a³+b³+3ab(a+b))

⇒x³+8+6x(x+2)=2x³−2x
⇒x³+8+6x₂+12x=2x³−2x
⇒x³+8+6x²+12x−2x³+2x=0
⇒−x³+6x²+14x+8=0

Since the variable x in the equation −x³+6x²+14x+8=0 has degree 3, therefore, it is not of the form ax²+bx+c=0.

Hence, the equation (x+2)³=2x(x²−1) is not a quadratic equation.

Hence the solution is 

A = 30°

= 

= tan60°

= 

Therefore,

The value of

 = $\sqrt{3}$

छोटा भाई अभी अनुभवहीन था। वह अपना भला बुरा नहीं समझ पाता था। यदि बड़े भाई साहब उसे डाँटते फटकारते नहीं तो वह जितना पढ़ता था उतना भी नहीं पढ़ पाता और अपना समय खेलकूद में ही गँवा देता। उसे बड़े भाई की डाँट का डर था। इसी कारण उसे शिक्षा की अहमियत समझ में आई, विषयों की कठिनाइयों का पता लगा, अनुशासित होने के लाभ समझ में आए और वह अव्वल आया।

(i) The Rowlatt Act was passed in 1919 by the British government despite the united opposition of the Indian members.
(ii) It gave enormous powers to the government.
(iii) Now, the British government could suppress the political activities, and allow detention of political prisoners without trial for two years.Indian people reacted to it stoutly. Under the leadership of Mahatma Gandhi, they
decided to launch a nationwide Satyagraha against the proposed Rowlatt Act (1919).
(i) Rallies were organised in various cities.
(ii) Workers went on strike in railway workshops.
(iii) Shops closed down.
To suppress the nationalists the British administration
(i) Put the local leaders in jail.
(ii) Debarred Mahatma Gandhi from entering Delhi.
(iii) On 10 April, the police in Amritsar fired upon a peaceful procession.
(iv) On 13 April, the Jallianwalla Bagh incident took place.

(i) In the year 1919, the British Government passed a new rule called Rowlatt Act, under which the Government had the authority and power to arrest people and keep them in prisons without any trial if they are suspected with the charge of terrorism. 

(ii) Mahatma Gandhi was extremely agitated by enactment of Rowlatt Act. He was extremely critical about the act and argued that everyone cannot be punished for isolated political crime. 

(iii) The Act was ill famed as 'Black Act' by the people and Indians revolt in protest against the Rowlatt Act.

The Rowlatt Act was passed by the British government to increase their grip on power over the common folk. This law was passed in March 1919 by the Imperial Legislative Council which gave them the power to arrest any person without any trial. To abolish this act, Gandhi and the other leaders called for a Hartal (suspension of work) to show Indians’ objection with this rule.

The impact of Rowlatt Satyagrah on political situation in India was immense. Gandhi organised Rowlatt Satyagrah against the Rowlatt Act which gave enormous power to the government to suppress the political activities of Indian leaders.

In opposition of the Act, protests and rallies were organised in various cities, workers went on strikes in railway workshops, and shops closed down. The British government tried to suppress the nationalist activity brutally. Local leaders were picked up from Amritsar, and Mahatma Gandhi was barred from entering Delhi. After attacks on post offices and railways, martial law was imposed and General Dyer took command. Jallianwala Bagh massacre took place on April 13, 1919. This incident shocked the entire nation. As the news of Jallianwalla Bagh spread, crowds took to the streets in many north Indian towns. There were strikes, clashes with the police and attacks on government buildings.

Thus, we can say that the Rowlatt Satyagrah led to an increase in nationalist activities of people in the country

Let the first term of an A.P. = a

And common difference = d

Given: 9^th term of an A.P. is 0. Therefore,

We have to prove that 

Thus,

And

From equation (2) and (3),

Hence provedc

Acceleration due to gravity above the surface of earth

• To calculate the value of acceleration due to gravity of a point mass m at a height h above thesurface of the earth.

Above figure shows the value ofacceleration due to gravity g at a height h above the surface of the earth.

• Force of gravitation between the object and the earth will be

• F= G mM_e/(R_e+h)²  where

• m = mass of the object, R_e = radius of the earth
• g(h) = F/m = GM_e/(R_e+h)² = GM_e/[R_e²(1+h/R_e)²]
• h << R_e (as radius of the earth is very large)

• By calculating we will get,

g(h) = g(1-2h/R_e)

• Conclusion: -The value of acceleration due to gravity varies on the surface, above the surface and below the surface of the earth.

Differences between stock resources and reserves

Or

Stock :-
Resources that satisfies human needs
These have not been utilized yet.
The reason is due to lack of technology
Example :-  Water [ it satisfies our needs , but we cant make water ourselves by combining hydrogen and water { lack of technology } ]

Reserves :-
These resources can be utilized by using appropriate technology.
Even after having technology to utilize it , it has been kept aside for future requirements
Example :-
Water in dams 

To,

The Principal

Unity College,

Lucknow.

3rd September, 2020

Subject- Regarding leave for two days.

Respected Sir,

I'm Reena from class 12th beg to inform you that I would be unable to attend the classes for two days i.e. 4th and 5th of September, 2020 because my father is not well and there is nobody to take care of him other than me.

I request you to kindly grant me leave for two days. I shall be highly obliged.

Thanking You.

Yours truly,

Reena Verma.

The Great Depression was the greatest and longest economic recession in modern world history. It began with the U.S. stock market crash of 1929 and did not end until 1946 after World War II. Economists and historians often cite the Great Depression as the most catastrophic economic event of the 20th century.

IUPAC name of CH3COOC2H5 is Ethyl acetate / Ethyl ethanoate

The following compound is ester R−COO−R′ and the naming of ester are done on the basis of alkanoate group (R−COO−) and alkyl (R′) combined to form ester.
The suffix for ester is "-oate". The full name of ester is like alkyl alkanoate. 
Thus the name of given compound is ethyl ethanoate.

The frequency of the light ray remains same when it travels from one medium to another because it depends on the source of light. But the wavelength and speed vary because they depend on the medium through which the light passes.