# Vivek

Most popular questions and responses by Vivek
1. ## Maths Mensuration

Prove that the area of a circular path of uniform width h surrounding a circular region of radius r is pi h (2r+h)

2. ## Maths Algebra

The size of a red blood cell is 0.000007 m and that of a plant cell is 0.00001275 m.Show that a red blood cell is half of plant cell in size

3. ## Maths Mensuration

The inner circumference of a circular track is 220 m.The track is 7 m wide everywhere.Calculate the cost of putting up a fence along the outer circle at the rate of \$2 per metre.

4. ## Maths Mensuration

The length and breadth of a park in the ratio 2:1 and its perimeter is 240 m. A path 2m wide runs inside it,along its boundary.Find the cost of paving the path at Rs 80 per square metre?

5. ## math

Triangle ABC , BC = CD and (angle ABC - angle bac ) =30, the measure of angle and is?

6. ## Maths Profit and Loss

By selling 125 cassettes,a man gains an amount equal to the selling price of 5 cassettes. Find the gain%.

7. ## Maths Algebra

A steamer goes downstream and covers the distance between two ports in 4 hours while it covers the same distance upstream in 5 hours.If the speed of the stream is 2 km/h.Find the speed of steamer in still water.Check your solution.

8. ## Maths Compound Interest

In a experiment the count of bacteria was increasing at the rate of 2.5% per hour. Initially, the count was 512000.Find the bacteria at the end of 2 hours?

9. ## Maths Mensuration

A field in the form of a parallelogram has base 15 dam and altitude 8 dam.Find the cost of watering the field at the rate of 50 paise per square metre???????Please help to solve this????????????????

10. ## Maths Pie chart

In the pie chart representing the percentages of students having interest in reading various kinds of books,the central angle of the sector representing students reading novels 81°. What is the percentage of students interested in reading novels?

11. ## Maths Algebra

A sum of Rs 8400 is made up of 50,20,10 and 5 rupee notes.The number of 10 rupee notes is five times the number of 5 rupee notes, four times the number of 20 rupee notes and ten times the number of 50 rupee notes.What is the number of notes in each

12. ## Maths Percentage

Find the percentage of pure gold in 22-carat gold, if 24-carat gold is 100% pure gold.

13. ## math

In how many ways a selection can be made of atleast one fruit of 5 bananas, 4 mangoes and 4 almonds

14. ## physics (motion)

the initial velocity of a particle is u (at t=0) and acceleration f is given by at.which relation is valid: (a)v=u+at^2 (b)v=u +at^2/2 (c)v=u+at (d)v=u

15. ## physics

What is force defin it

16. ## Maths Exponents

(1) 11×10^-5 .Express it in scientific notation. (2)The distance between sun☉ and earth🌎 is (1.496×10^11)m and the distance between earth 🌎 and moon 🌙 is (3.84×10^8)m.During solar eclipse moon comes in between earth and sun.At that time what

17. ## Maths Algebra

Half of a herd of deer are grazing in the field and three-fourths of the remaining are playing nearby.The rest 9 are drinking water from the pond.Find the number of deer in the herd.

18. ## Maths Percentage

The value of a machine depreciates every year by 10%.If the present value of the machine is Rs 54000,what was its value last year?

19. ## Maths Compound Interest

In what time will Rs 1000 amount to Rs 1331 at 10% per annum, compounded annually?

20. ## Maths Profit and Loss

The cost price of 12 candles is equal to the selling price of 15 candles . Find the loss%.

21. ## Maths Algebra

The diameter of Sun is (1.4 ×10^8)m and the diameter of Earth is (1.2742×10^4)m . Show that the diameter of sun is nearly 100 times the diameter of Earth.

22. ## Physics

The typical lifetime of a star like our Sun is 10 billion years. While a star like our Sun is able to generate energy in its core (through fusion) the thermal pressure balances the gravitational pressure from the Sun’s mass. However, once the star rules

23. ## james knox polk

how did he become famous? http://www.whitehouse.gov/history/presidents/jp11.html

24. ## Math

A rectangular Park of length 80m and width 65m has two paths of uniform width 2.5m crossing each other. Find the area of remaining portion.

25. ## Maths Algebra

In a Library stack there are 4 books each of thickness 24 mm and 6 paper sheets each of thickness 0.015 mm. What is the total thickness of the library stack in scientific notation?

26. ## Maths Profit and Loss

Oranges are bought at 6 for Rs 10 and sold at 4 for Rs 9. Find the gain% or loss%.

27. ## Science

a stone mass of 2.5kg is falling a certai height. Find the force of attraction between the earth and the stone. Also find its acceleration

28. ## Maths discount%

Find the single discount equivalent to two successive discounts of 20% and 10%.

29. ## Physics

A round object with mass m and radius R rolls down a ramp that makes an angle θ with respect to the horizontal. You can assume there is static friction so that the object rolls without slipping. a) For now, take the moment of inertia of the object to be I

30. ## jdt trignometric

tan¦È=7/24 then prove that ¡Ì(1-cos¦È/1+cos¦È)=1/7 WHERE 0

31. ## Science

What is comet how it fall and why he look blue

32. ## physics

what is the angular speed of one satellite as seen by an astronaut in another satellite?

33. ## chemistry

The label of a spread says that it contains, per 100 g product: 80 g fat; 20 g saturated fat. What is the percentage of saturated fatty acids expected in the fat extracted from this spread? 25% 80% none of these 20% 16%

34. ## chemistry

To make 10 mL of 25 mM sodium standard, what volume of 1 M NaCl stock should be used? 250 mL 2.5 mL 0.25 mL 0.5 mL None of these 400 mL

35. ## chemistry

To make 10 mL of 25 mM sodium standard, what volume of 1 M NaCl stock should be used? 250 mL 2.5 mL 0.25 mL 0.5 mL None of these 400 mL

36. ## Physics

A car reaches a speed of 40m/s from rest in a time of 8 seconds. After the 8 seconds, the car travels at a constant velocity fro 200meters when it runs out of gas. The car slowly comes to rest 30 seconds after running out of gas. Calculate acceleration for

37. ## physics

an object of mass 2 kg attached to wire length 5 cm is revolved in a horizontal circle if it makes 60rpm find angular speed

38. ## Maths Percentage

Due to an increase in the price of sugar by 25%,by how much percent must a householder decrease the consumption of sugar so that there is no increase in the expenditure on sugar?

39. ## Maths Algebra

In a hostel,50 kilogram milk are consumed everyday.If each student gets 400 gram of milk per day,find the number of students who take drinks in the hostel.

40. ## Maths Squares and Square roots

How to find the sum, without adding? (1)(2+4+6+8+10) (2)(1+3+5+7+9+11+13) (3)(2+4+6+8+10+12+14+16+18+20)

41. ## Maths Triangles

Prove that the sum of the angles of Triangle is 180°.

42. ## science

What is in orange, but not in banana, cherry has it, but not in apple?

43. ## geography

geography envoirment

44. ## Math

metrix method solve equation 2x-y-3z=9 ,x+y+z=6 ,x-y+z=2

45. ## Physics

A man pulls a bucket of water of mass 10kg from a well 5meter deep in 5 sec. Calculate the power of the man.

46. ## math

Find five rational numbers between - 3/5 and - 1/2

47. ## Maths Percentage

(1)Emraan income is 25% more than that of Syed. How many per cent is Syed's income less than that of Emraan? (2)Ram's income is 20% more than that of Lakshman. How many percent is Lakshman's income less than that of Ram? (3)Hero's income is 20% less than

48. ## Maths Percentage

Syed's income is 25% more than that of Emraan.How many per cent is Emraan's income less than that of Syed?

49. ## Maths Graph

Q1(a)-How to draw the graph of the function A=x^2. Q1(b)-From the graph, How to find the value of A,when (i)x=2 (ii) x=3 (iii)x=4

50. ## Maths Mensuration

An ox in a oil processing apparatus is tethered to a rope 3m long .How much distance does it cover in 14 rounds?

51. ## Maths Percentage

A period of 4 hours and 30 minutes is what per cent of a day?

52. ## Maths Algebra

Ravi owns a plot of rectangular shape.He has fenced it with a wire of length 750 m.The length of the plot exceeds the breadth by 5 m. Find the length and breadth of the plot.

53. ## Math

given f(x)= 5x+4/5x^2+4x and g(x) = 1/x simplify f(x) and find any vertical asymptotes

54. ## Maths Algebra

Solve and check the result.3(5x-7)-2(9x-11)=4(8x-13)-17

Prove that the sum of the angles of Quadrilateral is 360°.

56. ## Maths Time and Work

The rates of working of A and B are in the ratio 3:4.Find the number of days taken by them to finish the work?

57. ## Maths Unitary Method

If 5 men or 7 women can earn Rs 875 per day.how much would 10 men and 5 women earn per day?

58. ## Maths Algebra

Mass of Earth is (5.97×10^24)kg and Mass of Moon is (7.35×10^22)kg.What is the Total mass of the two?

59. ## Physic

What is comet how it fall

60. ## Physics

What is energy

61. ## physics

The earth's atmosphere extends to a height of nearby 200KM above its surface there many be explosion and noises taking place in the outer space but we do not hear them.why?

62. ## math

what is the perimeter value of r=a(1+cos theta)

1. ## physics

4 ohm

posted on June 10, 2018
2. ## Physics

Here,m=10kg h=5meter t=5sec g=10m/s and,since P=(m×g×h)÷t (10×10×10)÷5 =100

posted on December 18, 2017
3. ## math

4/5

posted on May 28, 2017
4. ## trig

75/2

posted on February 20, 2017
5. ## Maths Congruence

This is a right triangle.

posted on September 21, 2016
6. ## math

Decimal form of 5/8 = 0.625 Decimal form of 4 5/8 = 0.625+4 =4.625 HENCE DECIMAL FORM OF 4 5/8 is 4.625.

posted on August 19, 2016
7. ## Maths Mensuration

Let the inner and outer radii of the circular track be R metres and m metres respectively.Then,Inner circumference=220 metre (Use pi= 22/7) 2piR=220 2×22/7×R=220 R=35 m Since the track is 7 metre wide everywhere. m=Outer radii = R+7 = (35+7)m=42 m Outer

posted on August 19, 2016
8. ## maths

A=D1*D2 LIKE D=24 AND 18. SO 24*18=432. THEREFORE AREA=432 . AND SIDE= SQRT D1*2+D2*2 . SO GIVEN D1 AND D2 =24 AND 18 =SQRT 24^2 +18^2= 576+324 =900 THEREFORE SIDE= sqrt900=30.

posted on September 21, 2014
9. ## maths

3-0 9-0 11-5

posted on July 16, 2013
10. ## physics

Assume g= 10 m/sec2 60*x1 + 35*x2 = 1.3*10=13 on observation we get x1= 0.1 m x2= 0.2 m so tan(angle)= .1/.8= .125 angle= 7.125 degree

posted on December 14, 2012
11. ## Physics

Wgat is energy

posted on February 20, 2012
12. ## physics

The capacity do to work

posted on January 3, 2012
13. ## physics

300 cos 35.2 - Fk = ma fk = 300 cos 35.2 - ma Fn = mg + 400 sintheta = 300 + 400 sin 35.2 Fk = Fn*uk uk = 0.57 300 cos 35.2 - ma = 0.57 [ 300 + 400sin 35.2] -ma = (0.57)[300+400sin35.2]- [300 cos 35.2] a = all that crap on the right side/ (300N/0.9) a =

posted on October 23, 2011
14. ## Math

b. 525 is the population of the frogs after 5 years

posted on March 28, 2011
15. ## math

44 degree

posted on March 28, 2011
16. ## math

we have problem it'sa regular quadilateral example given by u is not correct

posted on November 8, 2009