Thursday

October 23, 2014

October 23, 2014

Total # Posts: 24

**physics**

a 150 metre long train crosses a bridge of length 250 metres in 25 seconds find its velocity
*June 11, 2014*

**maths**

5x^(3)+ 6x^(2)+8 =(Ax+1)(x-2)(x+B)+x-5C
*May 27, 2013*

**social**

Crisis Management What can the government, individual and society do to combat crisis like a. Bomb blast / terrorist attack b. Earthquake c. Floods d. Fire accident.
*May 27, 2013*

**maths**

for a particular stretch of road it is estimated that on average one car in ten exceeds the speed limit. on a particular day 2003 cars use that stretch of road. use a suitable approximation to find t
*May 16, 2013*

**chemistry**

Plastic articles can be chromium-plated by coating them with thin layer of graphite paste,placing them in a bath of aqueous chromium(III) sulphate and electroplating. a)Suggest a reason why the article is first coated with graphite. b)what substance could be used for the other...
*March 10, 2013*

**maths **

The lifetime in hours of a certain make of batteries follows a normal distribution with mean 160 and standard deviation 30. Calculate the interval, symmetrical about the mean within which 75% of the battery lifetimes lie.
*February 13, 2013*

**maths **

the masses of lettuces sold at a market stall are normally distributed with the mean 600g and standard deviation 20g. 1) find the mass exceeded by 10% of the lettuces. 2) 5% of the lettuces have a mass less than M g. find M
*February 13, 2013*

**maths **

x ~ N(400,64) 1) Find the limits within which the central 95% of the distribution lies. 2) find the interquartile range of the distribution.
*February 13, 2013*

**maths **

the heights of female students at a particular college are normally distributed with the mean 169 cm and standard deviation 9 cm. 1) Given that 80% of these female students have a height less than h cm ,find the value of h. 2) Given that 60% of these female students have a ...
*February 13, 2013*

**maths**

An intelligence test used in a particular country has scores which are normally distributed with mean 100 and standard deviation 15.In a randomly selected group of 500 people sitting the test, estimate how many have a score 1)higher than 140, 2)below 120, 3)between 100 and 110...
*February 13, 2013*

**chemistry**

in an attempt to establish the formula of an oxide of nitrogen , a known volume of the pure gas was mixed with hydrogen and passed over a catalyst at a suitable temperature. 100% conversion of the oxide to ammonia and water was shown to have taken place. NxHy gives xNH3 + YH20...
*February 13, 2013*

**physics**

A student wishes to measure the resistivity of glass. A teacher suggests that its resistivity is of the order of 10^6 Ω m which is very large. Resistivity ρ is defined by the equation: ρ = RA / l where R is resistance, A is cross-sectional area and l is the ...
*February 13, 2013*

**chemistry **

an aqueous solution contains 1 mol of S2O3 ions and this reduces 4 mol chlorine molecules.What is the sulphur containing product of this reaction?
*February 10, 2013*

**chemistry **

in an attempt to establish the formula of an oxide of nitrogen , a known volume of the pure gas was mixed with hydrogen and passed over a catalyst at a suitable temperature. 100% conversion of the oxide to ammonia and water was shown to have taken place. NxHy gives xNH3 + YH20...
*February 10, 2013*

**chemistry **

an aqueous solution contains 1 mol of S2O3 ions and this reduces 4 mol chlorine molecules.What is the sulphur containing product of this reaction?
*February 10, 2013*

**chemistry **

an aqueous solution contains 1 mol of S2O3 ions and this reduces 4 mol chlorine molecules.What is the sulphur containing product of this reaction?
*February 10, 2013*

**physics**

How can we determine the centre of mass of a hollow sphere?
*October 26, 2012*

**chemistry**

If 3.5 ml 0f N/50 AgNO3 was used in titration of chloride ion for 10 ml water sample then calculate the strength of chloride ions
*June 1, 2012*

**calculus**

integral from 1 to e^5 1/(x(sqrt4+lnx))dx
*February 22, 2012*

**computar **

sdfsdgfs sdffgsdafgfg gfgafgsagrfetafdf f
*May 14, 2011*

**5th grade**

addition subtraction multiplication and division
*October 14, 2010*

**economics**

1. Given a firm’s demand function, P = 24 - 0.5Q and the average cost function, AC = Q2 – 8Q + 36 + 3/Q, calculate the level of output Q which a) maximizes total revenue b) maximizes profits
*September 11, 2010*

**Ryan school maths**

it is an equation 9b- 4b+ 3b= 16 plese write it step by step
*June 3, 2010*

** Chemistry**

nh3 has high b.p. than phz give resion
*October 2, 2009*

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