# Posts by arun

Total # Posts: 57

**MATH**

cosA=1/2 than cos4A=?

*February 18, 2017*

**Maths**

Collect marks of 10 of your classmates in different subjects in the recent examination.estimate mean of mark in each sub

*December 4, 2016*

**Maths**

From a point on a ground the angle of elevation from a tower is observed to be 60 degree. From a point on 40meter vertically above the first point of observation the angle of elevation from a tower is 30degree. Find the height of the tower and horizontal distance from the ...

*November 6, 2016*

**Science**

A piece of wire of resistance R and cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R1 then the ratio of R and R1 is what.

*September 29, 2016*

**Math**

when 4^101+6^101 is divided by 25, the remainder is: (A)20 (B)10 (C)5 (D)0

*August 26, 2016*

**math**

Find the largest number which divides 630 and 940 leaving remainder 6 and 4 respectively

*June 2, 2016*

**physics**

I am 6 feet tall,weigh 69kg slipped and fell flat in 2 seconds,hitting iron bar on side of stairs.What is the force of impact on the soles at the time of impact at the end of 2 seconds? PS:this really happened that has destroyed my soles from the force of impact injury.

*February 7, 2016*

**statistics**

in a shipment of 7 items there are three defective items. at random 4 items are selected what is the expected number of defective items?

*January 15, 2016*

**chemistry**

The volume of 0.025M Ca(OH)2 solution which can neutralise 100ml of0.0001M H3PO4

*August 31, 2015*

**Sci**

Which has minimam pkb

*March 20, 2015*

**math**

Perimeter of rectangle and a square are equal. Perimeter of the square is 96 cm and breadth of the rectangle is 4 cm less than the side of the square. Then two times the area of the rectangle is

*January 24, 2015*

**Maths**

0.083

*January 22, 2015*

**Science**

What is the term use to study the satellite television instruction experiment?

*November 1, 2014*

**trig**

The angle of depression of the top and bottom of a tower as seen from the top of a 100m high cliff are 30degree and 60degree respectively. find the height of the tower

*December 28, 2013*

**english**

write a report. how plastic are harmful to environment.suggest some ways to keep public places clean.

*June 19, 2013*

**english**

write a letter to your friend who affected from tsunami.inquiring and suggesting him about the matter.

*June 19, 2013*

**maths**

f and g are functions defined as f(x)=5x+6/2x−2 and g(x)=4x/3x−2. What is the value of (f∘g)(4)? Note: f∘g denotes the composition of the 2 functions.

*March 2, 2013*

**Math**

6x2=12 12/2=12

*May 16, 2012*

**Probability and statistics**

10. The mean of the number of tosses on which a prime number occurs when a balanced dice is tossed 5 times is equal to Choose one answer a. 5/3 b. 3 c. 5/2 d. 2

*March 2, 2012*

**Probability and statistics**

9. For the data -2,-1,-2, 4, 1, 0; let A denote the sample mean and M denote the sample median. Then Choose one answer a. A=0,M=0 b. A=0,M=-0.5 c. A=0.5,M=0.5 d. A=0.5,M=-0.5

*March 2, 2012*

**Probability and statistics**

8. A random variable X takes exactly the 5 values 1, 2,3,4,5, all with same probability. The mean of X is Choose one answer a. 2.5 b. 15 c. 7.5 d. 3

*March 2, 2012*

**Probability and statistics**

7. A Continuously running washing machine receives jolts in a Poisson process at an average rate of 5 jolts per hour. The probability that it receives no jolts in given 20 minute run Choose one answer a. e−5 b. e−5/3 c. e−100 d. e−100/3

*March 2, 2012*

**Probability and statistics**

6. The probability that at most 3 tosses of a balanced dice are required to get a prime number on top is equal to Choose one answer a. 7/8 b. ¼ c. ½ d. ¾

*March 2, 2012*

**Probability and statistics**

5. The probabilities that the lifetime of a randomly chosen device is below average, average, above average are respectively 0.2, 0.5, and 0.3. The probability that the 3 randomly chosen devices lifetimes of 2 are above average and 1 below average equals Choose one answer a. 0...

*March 2, 2012*

**Probability and statistics**

4. The probability that a prime number occurs on at least 2 tosses when a balanced dice is tossed 5 times independently is equal to. Choose one answer a. 26/32 b. 30/32 c. 6/32 d. 16/32

*March 2, 2012*

**Probability and statistics**

3. To test a lot of its production units, the quality control department of the production company randomly tests 5 different units of the lot and passes the lot if at most 1 of the units are faulty. If exactly 4 of the units of the lot are faulty, the probability that the lot...

*March 2, 2012*

**Probability and statistics**

2. The standard deviation of the number of tosses required to get a 1 when a balanced dice is tossed repeatedly is equal to Choose one answer: a. √6 b. √30 c. 6 d. 30

*March 2, 2012*

**Probability and statistics**

1. In a City, out of 20000 news paper subscribers, exactly 5000 subscribe to The Hindu. An advertising firm surveys 500 different subscribers of these 20000 subscribers. The random variable X = the number of The Hindu subscribers surveyed by the advertizing firm, has Choose ...

*March 2, 2012*

**Math**

A continuously running washing machine receives jolts in a Poisson process at an average rate of 5 jolts per hour. The probability that it receives no jolts in given 20 minutes run e-5,e-5/3,e-100,e-100/3

*March 1, 2012*

**Probability and statistics**

The probability that at most 3 tosses of a balanced dice are required to get a prime number on top is equal to a. 7/8, b.1/4, c. 1/2, d.3/4.

*March 1, 2012*

**Probability and statistics**

The probability that the life time of randomly chosen device is below average, average,above average are respectively 0.2,0.5,0.3. The probability that of the 3 randomly chosen devices lifetimes of 2 are above average and 1 below average equals a.0.054,b.0.018,c.0.036,d.0.012

*March 1, 2012*

**physics**

7200kg/

*April 27, 2011*

**physics(please help...very urgent.....)**

A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance. i have posted the same question earlier and i got some steps...

*April 12, 2011*

**maths(urgent....please...)**

1) A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance. i have posted the same question earlier and i got some ...

*April 12, 2011*

**calculas(URGENT..... PLEASE....)**

1) A region is bounded by the line y = x and the parabola y = x2 - 6x + 10. What is the volume of the solid generated by revolving the region about the x-axis? would u please give the explanation with a detailed steps to the answer because i am not able to reach the final ...

*April 12, 2011*

**statistics**

Letx+y=9 and x-y=5 then 2x=14 x=7 then y=2

*April 12, 2011*

**maths**

would you please give the graphical representation of the region bounded by the line y=x and the parabola y=x^2-6x-10?

*April 11, 2011*

**algebra 1**

n+8n+60=110 n+8n=110-60 9n=50 n=50/9

*April 11, 2011*

**maths(urgent....please...)**

A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance. math - Henry, Friday, April 8, 2011 at 9:59pm X = hor. = 26Ft...

*April 9, 2011*

**physics.....help me please....**

1) A 1.0 kg mass is attached to the end of a vertical ideal spring with a force constant of 400 N/m. The mass is set in simple harmonic motion with an amplitude of 10 cm. What is the speed of the 1.0 kg mass at the equilibrium position?

*April 8, 2011*

**MATH VERY URGENT!!!!!!**

1) A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance.

*April 8, 2011*

**math**

2) A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance.

*April 7, 2011*

**math**

2) A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance.

*April 6, 2011*

**physics**

1) A 1.0 kg mass is attached to the end of a vertical ideal spring with a force constant of 400 N/m. The mass is set in simple harmonic motion with an amplitude of 10 cm. What is the speed of the 1.0 kg mass at the equilibrium position?

*April 6, 2011*

**physics**

2) Two objects, A and B, initially at rest, are "exploded" apart by the release of a coiled spring that was compressed between them. As they move apart, the velocity of object A is 5 m/s and the velocity of object B is -2 m/s. What is the ratio of the mass of object ...

*April 6, 2011*

**physics**

1) A 1.0 kg mass is attached to the end of a vertical ideal spring with a force constant of 400 N/m. The mass is set in simple harmonic motion with an amplitude of 10 cm. What is the speed of the 1.0 kg mass at the equilibrium position?

*April 6, 2011*

**physics**

1) A 1.0 kg mass is attached to the end of a vertical ideal spring with a force constant of 400 N/m. The mass is set in simple harmonic motion with an amplitude of 10 cm. What is the speed of the 1.0 kg mass at the equilibrium position?

*April 6, 2011*

**calculas**

2) A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance.

*April 6, 2011*

**math**

1) A region is bounded by the line y = x and the parabola y = x2 - 6x + 10. What is the volume of the solid generated by revolving the region about the x-axis?

*April 6, 2011*

**math**

Write the following expression as the sine, cosine, or tangent of an angle: cos45°cos120° - sin45°sin120°

*April 6, 2011*

**math**

2) A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance.

*April 6, 2011*

**math**

1) A region is bounded by the line y = x and the parabola y = x2 - 6x + 10. What is the volume of the solid generated by revolving the region about the x-axis?

*April 6, 2011*

**math**

what is this

*September 24, 2010*

**science**

A neckless weighing 50 g in air, but it wheighs 46 g in water . Assume copper is mixed with gold to prepare the neckless. Find out how much of copper is present in it?(specific gravity of gold is 20 and that of copper is 10)

*May 5, 2010*

**Statistics**

i can learn statistics problems

*December 17, 2009*

**Medicine**

Can I get some information on the useage of Leech Therapy in control of Obesity in Humans with respect to the Anotomy of Leeches?

*September 30, 2008*

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