>Weight of the body,W=63 N
Acceleration due to gravity at height h from the Earths surface is given by the relation:

g′ =g​/ (1+h/Re​​)²

Substituting h=Re​/2,

g′=4g/9

Weight of body of mass m at height h is given as:

W′=mg′

       =4/9 mg

       =4/9×63=28 N

Gravitational potential energy is the energy possessed or acquired by an object due to a change in its position when it is present in a gravitational field. In simple terms, it can be said that gravitational potential energy is an energy which is related to gravitational force or to gravity.

The gravitational influence on a body at infinity is zero, therefore, potential energy is zero, which is called a reference point.

A pipe will have two layers as shown in picture.  

There is a inner Cylinder and Outer Cylinder.

Inner Radius = Inner Diameter / 2 = 4 / 2 = 2 cm = r

Outer Radius = Outer Diameter / 2 = 4.4/2 = 2.2 cm = R

Height of the pipe = 77 cm = h

Inner Surface area of the Pipe = 2∏rh = 2×22×2×77/7 = 968 Square cm.

Outer Surface area of the pipe = 2∏Rh = 2×22×2.2×77/7 = 1064.8 Square cm.

Total Surface area = Inner Surface area + Outer Surface area + 2 × Cross section surface area.  

The cross section suface area is present at two ends of the pipe.  

This is the area covered between 2 circles.  

Total Surface area = Inner Surface area + Outer Surface area + 2 × Cross section surface area.  

= 968 + 1064.8 + 2×∏(R^2 – r^2)

= 2032.8 + 2×22×(2.2×2.2 – 2×2)/7

= 2032.8 + 5.28

= 2038.08 Square cm.

1. What is the disadvantage in comparing line segments by mere observation?

Solutions:

By mere observation we can’t compare the line segments with slight difference in their length. We can’t say which line segment is of greater length. Hence, the chances of errors due to improper viewing are more.

2. Why is it better to use a divider than a ruler, while measuring the length of a line segment?

Solutions:

While using a ruler, chances of error occur due to thickness of the ruler and angular viewing. Hence, using divider accurate measurement is possible.

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<a data-ved="2ahUKEwiFhMqM7O_tAhUHdCsKHbwjDrkQFjAAegQIBBAC" href="https://mycbseguide.com/blog/ncert-solutions-class-6-maths-exercise-5-1/" ping="/url?sa=t&source=web&rct=j&url=https://mycbseguide.com/blog/ncert-solutions-class-6-maths-exercise-5-1/&ved=2ahUKEwiFhMqM7O_tAhUHdCsKHbwjDrkQFjAAegQIBBAC" rel="noopener" target="_blank">NCERT Solutions for Class 6 Maths Exercise 5.1 ...</a>

1. Introduction 2. What is Development? 3. Sustainable Development 4. Views of Sustainable Development 5. Concept of Sustainable Development 6. Evolution of SD Concept: 7. The pillars of sustainable development 8. Changing Perspective of SD 9. Approaches of Sustainable Development 10. Sustainability principles 11. Multiple Crises and Sustainable Development 12. Conclusion. OUTLINE

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<a data-ved="2ahUKEwiDv9Gd7O_tAhWaAHIKHSWWCAAQFjAPegQIDxAC" href="https://www.slideshare.net/KuldeepMishra15/sustainable-development-53121161" ping="/url?sa=t&source=web&rct=j&url=https://www.slideshare.net/KuldeepMishra15/sustainable-development-53121161&ved=2ahUKEwiDv9Gd7O_tAhWaAHIKHSWWCAAQFjAPegQIDxAC" rel="noopener" target="_blank">Sustainable development - SlideShare</a>

A firm manufactures two types of products A and B and sells them at a profit of Rs.5 per unit of type A and Rs.3 per unit of type B. Each product is processed on two machines M 1 ​ and M 2 ​ . One unit of type A requires one minutes of processing time on M 1 ​ and two minutes of processing time on M 2 ​ , whereas one unit of type B requires one minutes of processing time on M 1 ​ and one minutes on M 2 ​ . Machines M 1 ​ and M 2 ​ are respectively available for at most 5 hours and 6 hours in a day. Find out how many units of each type of product should the firm produce a day in order to maximize the profit. Solve the problem graphically.

Answer:

After the downfall of the monarchy in Russia in February 1917, the Bolshevik leader Vladimir Lenin returned to Russia from his exile in April 1917. He felt that it was time for Soviets to take over power. He put three demands which were known as Lenin's 'April Theses'. They were:
(i) The war (First World War) be brought to an end.
(ii) Land be transferred to the peasants. 
(iii) The banks be nationalised.
When Lenin came to power he became active to bring changes Banks were nationalised in November, 1917. This meant that the government took over ownership and management. Land was declared social property and peasants were allowed to seize the land of the nobility. In March 1918, despite opposition by their political allies, the Bolsheviks made peace with Germany at Brest Litovsk.

Dwarfs - Smaller stars are called dwarf stars. Red and yellow stars are generally called dwarfs. A brown dwarf is one that never quite got large enough for nuclear fusion to occur. A white dwarf is the remnants of the collapse of a red giant star.

The blood group characteristic in humans is controlled by three set of alleles, namely, I^A, I^B, and i. The alleles, I^A and I^B, are equally dominant whereas allele, i, is recessive to the other alleles. The individuals with genotype, I^A I^A and I^A i, have blood group A whereas the individuals with genotype, I^B I^B and I^B i, have blood group B. The persons with genotype I^A I^B have blood group AB while those with blood group O have genotype ii.

Below you will get a link to download the official books and Notes from CBSE for Class 10 IT CODE 402 2021. These notes and books provided below are official and the link is also official. You can download it with a single click this will surely help you in the preparation of your examination.

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Yes it will. Even if half of the convex lens is covered with black paper, the lens will produce a complete image. however the intensity of the image may be less. It can be observed experimentally by using a lighted candle and a convex lens.

Experiment - 

1. Take a lighted candle and place it in front of a convex lens mounted on a plane surface.

2. Move the candle along the axis of the plane to obtain the full image on the screen. Once the full image is observed, mark the position of the candle without moving it.

3. Now cover the lower exact half of the lens with a black opaque paper. Do not change the position of the candle.

4. At this point, you will observe a full image of the candle, but you will find that the intensity is reduced. This is because the covered part of the lens does not allow light to pass through it. So the amount of light reaching the screen is reduced.

Diagram - 

Following are a few advantages of the heating effect of current:

1)The heating effect of current is used in heating appliances such as electric iron, room heaters and water heaters.

2) An electric fuse is an important application of the heating effect of current. The working principle of the fuse is based on the heating effect of current.

3) They are also utilised in electric bulbs and electric lamps to produce light.

Following are the disadvantages of the heating effect of current:

1) When an electric current flows through the conductor, a part of it is converted into heat energy. This is a waste of energy.

2) The heat produced can damage the insulation and other electrical components, or even cause a fire

3) Reduces the life of several components in the circuit

4) An additional cooling system needs to be added to the circuit to counter the heating effect. This adds to the cost.

• Easy data entry and operations: One of the main advantages of MS excel is that it facilitates smooth and easy data entry. Compared to any other data entry and analyzing tools, MS Excel offers features like Ribbon interface, a set of commands used to perform certain operations. Ribbon consist of many tabs, which again consist of many command groups and their buttons. You can select the commands by clicking the related button and perform operations very easily.

• Accurate comparisons and analysis options: MS Excel provides many analytical tools for the accurate analysis and comparison of large amounts of data. The advanced sorting and filtering techniques allows you to sort out large amount of data so that it will be easier for you to find out the required information. Also, filtering removes unwanted or repeated data and helps to save time and effort.

• Allows graphical representation of data: MS Excel allows you to create the visual representation of data and information. The data can be visually displayed in the form of bar charts, column charts and graphs. It automatically revises the charts and graphs, once the data gets modified. Tables help to classify different entities according to their characteristics and features.

• Compatible with other business applications: Since the recent versions of MS Excel is compatible with many other business applications like MS office, other web applications etc., it allows you to import excel data to other applications. Also, the cloud computing facility helps to update and upload your excel document from all locations, which can be accessed later through various devices like smartphones, tablets, laptops etc.

• Ready to use formulas: MS Excel performs all mathematical and logical functions like addition, subtraction, multiplication, division, average, sum, mod, product etc. Excel provides many formulas that helps you to solve both simple and complex calculations.

• Where one-colour merges into another and there is no definite boundaries, that spectra is called continuous spectra.
• If we study it for atoms the spectra obtained is discontinuous spectra.
• The study of spectra is called spectroscopy

  The potential difference between two points is said to be 1 volt if 1 joule of work is done in moving 1 coulomb of electric charge from one point to another.

देव + आलय = देवालय;

1.Statue of liberty is being offered homage by the people passing by the train. The men who travel by train are Americans and Europeans.

2.Statue of liberty is explained. It holds en enlightenment torch in the left hand and on the right hand, it has the Rights of the Man.

3.The symbols associated with the absolutist institutions and its shattered remains are seen.

4.The development path is taken by the people of the world. Peace and prosperity take a major place in the minds of the people.

Prakashan Nagar,

Secunderabad, Andhra pradesh

14th oct. 2020

Book Haven Store

Subject: Give reason for being unable to pick up the goods .

Sir

I am sorry to inform you that I was unable to pick up my order. I feel great sorrow that you do extra effort to send my order.

I am unable to collect my order because all member of my family were live in village except my younger brother. Whom I can't leave alone now because he is suffer from fever.

So I Implore you to make a home of my order, that I ordered on phone. I make extra payment for your order.

Your Truly

Vijay

VIJAY

 (a) Identify three triangles in the figure.

(b) Write the names of seven angles.

(c) Write the names of six line segments.

(d) Which two triangles have ∠B as common?

Answer: a) ΔABD, ΔADC and ΔABC

b) ∠ABD, ∠BDA, ∠ADC, ∠DCA, ∠CAB, ∠CAD, ∠DAB

c)   AB, AC , BC , BD , DC , AD

d) Δ ABD & ΔABC

LCM of 18, 24 and 32:

18 = 2 x 3 x 3

24 = 2 x 2 x 2 x 3

32 = 2 x 2 x 2 x 2 x 2

LCM = 2 x 2 x 2 x 2 x 2 x 3 x 3 = 288

The smallest four digit number that is divisible by 288:

288 x 3 = 864

288 x 4 = 1152

Since 288 is divisible by 18, 24 and 32, 1152 is also divisible by all these numbers.

Therefore, 1152 is the smallest four digit number divisible by 18, 24 and 32.