# ravi

Most popular questions and responses by ravi
1. ## Probability

The random variables X and Y have a joint PDF of the form fX,Y(x,y)=c⋅exp{−12(4x2−8x+y2−6y+13)} E[X]= var(X)= E[Y]= var(Y)=

2. ## Physics

A coin is placed 26 CM from the center of a horizontal turnable intially at rest. The turnable begin to ratate. When the speed of coin is 120 CMS rotating at constant rate the coin just begin to slip the acceleration of gravity is 980 CM/S2. What is the

3. ## statistics

A company produces batteries whose lifetimes are normally distributed with a mean of 100 hours. It is known that 90% of the batteries last at least 40 hours. (i). Estimate the standard deviation lifetime. (3 marks) (ii). What percentage of batteries will

4. ## science

If 1,2,3,4 moles of H3po4, nah2po4, na2hpo4, and na3po4 are mixed in an aqueous solution.find the pH. Ka1=10^-3, Ka2=10^-7, ka3= 10^-13

5. ## dynamics

A train which is moving with uniform acceleration is observed to take 20 and 30 seconds to travel succesive 0.4km.how much far then will it travel before coming to rest, if the acceleration remains constant

6. ## MATH

Maria found 1 penny on Mon under her pillow, 2 on Tuesday and 4 on Wed. On Thurs, Fri, Sat and Sun she found double the amount she found under the pillow she found the day before. how much money does Maria have on Sunday?

7. ## physics

Determine the moment of inertia for three children weighing 57.0 lb, 42.0 lb and 78 lb sitting at different points on the edge of a rotating merry-go-round, which has a radius of 12 ft.

8. ## physics

A disk with a mass of 16 kg and a radius of 41 cm is mounted on a frictionless horizontal axle. A string is wound many times around the disk and then attached to a 70-kg block, as shown in the figure. Find the acceleration of the block, assuming that the

9. ## Physics

A model rocket has a mass of 3.00 kg. It is fired so that when it is 220 m above the ground it is travelling vertically upward at 165 m/s. At that point its fuel runs out so that the rest of its flight is without power. Assume that the effect of air

10. ## Physics

A train which is moving with uniform acceleration is observed to take 20 and 30 seconds to travel succesive 0.4km.how much far then will it travel before coming to rest, if the acceleration remains constant?

11. ## science

A train which is moving with uniform acceleration is observed to take 20 to 30 seconds to travel successive 0.4km.how much far then willing travel before coming to rest, if the acceleration remains uniform?

12. ## Physics

A net force of 5.75 * 103 N [180degree ] acts on a mass of 23.0 kg. If, while the force acts, the mass travels through a displacement of 360 m [210 degree ], what work did the net force do on the object? Into what form of energy was this work transferred?

13. ## msths

Solve z/3 = 5/4

14. ## computer programming

: Create a program like KBC game show where program ask user 3 different question one after another and the user should answer them. If the answer are correct then pop up the message as “you got the right answer” and must ask user does he/she wants to

15. ## Math

x2+y2+z2-x(al1+bl2+cl3)-y(am1+bm2+cm3)-z(an1+bn2+cn3)=0 solve this equation

16. ## maths

the area of trapezium is 276cm2 and its height is 24cm.if one of its parallel side is longer than other by 7cm.find the length of parallel side.

17. ## MATH

THE HOSTEL OF AN ENGINEERING INSTITUTE HAS 320 STUDENTS AND THE FOOD STOCK FOR 80 DAYS. IF 20 STUDENTS LEAVE THE HOSTEL AFTER 20 DAYS,FOR HOW MANY MORE DAYS WILL THE FOOD LAST?

18. ## physics

Why standing waves are called standing?

19. ## survey of accounting

1. A corporation issues \$18,000,000 of 6% bonds to yield an effective interest rate of 7%. a) was the amount of cash received from the sale of the bonds more or less than \$18,000,000? b) identify the following amounts related to the bond issue: 1) face

20. ## maths

the net of acuboid measuring Xcm *8 cm *4 cm. the length are 25cm calculate length Xcm.

21. ## math

area of trapezium is 267square mt.parallel sides are 6m and 30m non parallel sides is 2m less then other find the length of non parallel sides.find the length of non parallel side

22. ## Science

When an object and screen are separate d by 1m distance. when a convex lens is place d at 30 cm from the object it forms a clear image then the image distance is?

23. ## math

Find the greatest number of three digits that can be exactly divided by 75,45 and 60

24. ## B-Tech mechanical

At a point in a strained material the principal stresses are 60MPa and 40MPa. Find the position of the plane across which the resultant stress is most inclined to the normal and determine the value of this stress.

25. ## math

give me answer show that one and only one out of n,n+4,n+8,n+12 and n+16 is divisible by 5, where n is any positive integer

26. ## geometry

the adjacent angle of parallelogramare in the ratio of 2:3 find themeasure of all the angles

27. ## rao's iit 6 class

if sides of a triangle is in the ratio 2,3,4 and shotest side is 6cm then find perimeter of a triangle?

28. ## meaning of Quotes

Some body please tell me the meaning of "early to bed, early to rise...helps a girl to go with other guys"

29. ## Trigonometry half angles

Tan75/2 ka solution dena sir lekin vistar se

30. ## Algebra

An artist paints t shirts. It takes 15 mins to set up and 40 mins to clean up. Once it is set up it takes the artist 12 mins to paint the shirt. What would an equation be for how many shirts he makes in 127 mins?

31. ## physics

What is the difference b/w longitudinal wave and transverse wave ?

32. ## math

if sum of two numbers is c and their quotient is p/q then find number.

33. ## Quantum Computing

Suppose H|ψ> = 1/√2 (|000> + |111>). What is |ψ> ? Specify the probability amplitude for each component: |000> = |001> = |010> = |011> = |100> = |101> = |110> = |111> =

34. ## Quantum Computing

Suppose we have |ϕ⟩=∑y∈{0,1}nβy|y⟩ such that βy=0 if s⋅y=1mod2 and βy=12(n−1)/2 if s⋅y=0mod2, where s is some hidden n-bit string. Assume that s is not the all-zero string 00⋯0. (a) If we run Fourier sampling on |ϕ⟩, what is the

35. ## shbhvghs

What is the direction of the total electric field at any point on the axis where

36. ## math

a library was mistakenly charged sales tax on an order of children's books, the invoice, including 5% sales tax, was for \$1323. how much should the library have been charge?

37. ## Dav,science

U find your mass to be 42 kg on weighing machine.is your mass more or less than 42 kg?explain

38. ## english

Assuming that you are a mirror' explain it is a man's best friend in his youth and worst enemy in one's old age

1. ## arithmetic

All well

posted on February 13, 2019
2. ## arithmetic

Your is nice it helps me a lot

posted on February 13, 2019
3. ## Physics

Sqroot74 =ans

posted on June 22, 2018
4. ## Physics

ha ha scott great knowledge of error

posted on June 22, 2018
5. ## Physics

answer is p=(24+_1.6) As p=vi take log both side and diffrentiate we get (^=delta) ^p/p=^v/v+^i/i ^p=maximum possible error in p ^v=0.1 v=6 ^i=0.2 i=4

posted on June 22, 2018
6. ## maths

Let vertex is x Basa angles are 2x We know that Sum of angles in triangle is 180 X+2x+2x=180 5x= 180 X=36 Base angle=2(36) =72 Exterior angles = sum of interior angles =72+72 =144

posted on March 20, 2017
7. ## physics

2sin-ecos

posted on August 4, 2016
8. ## math

x=12

posted on August 30, 2015
9. ## math

length=23 and width=19

posted on August 30, 2015

Estimate the square root of 72 how to find it

posted on August 19, 2015
11. ## math-data management

no

posted on September 3, 2014
12. ## chemistry

What is the normality of 1 M H3PO4 solution?

posted on August 24, 2014
13. ## Math (Probability)

you all ***** .......... giving wrong answer ..

posted on May 11, 2013
14. ## MATH

64 DAYS

posted on February 26, 2012
15. ## chemistry

Light or visible light is electromagnetic radiation that is visible to the human eye, and is responsible for the sense of sight.[1] Visible light has wavelength in a range from about 380 nanometres to about 740 nm, with a frequency range of about 405 THz

posted on December 2, 2011
16. ## Math

Take 1st equation 2m-3p-n=0 Take 2nd equation 2m-5p-n=14 ---------- now exchnage signs of the 2nd equation and do adition with changed signs. 2m -3p -n= 0 2m -5p -n= 14 (-) (+) (+) (-) -------------------- 2p = -14 p = -7 value of p is -7

posted on August 22, 2011
17. ## math

Take n=1 6^1+4 =>10 which is divisible by 5. 6^n+4 is divisible by 5 for all nEN. Take n= n+1 6^n+1 +4 => 6^n*6 +4 => 6[6^n +4] as 6^n+4 is divisible by 5 for all nEN 6*[multiples of 5] also divisible by 5 Hence 6^n+4 is divisible by 5 for all nEN.

posted on August 22, 2011