Recent content by UNknown 2010

Hi my question is TiO2 + C + 2Cl = TiCl4 + CO2 If you have 1.25 mol TiO2. Answer this question: 1- The mas of Cl2 (1.25 mol TiO2) ((2 mol Cl2)/(1 mol Tio)) = 3 mol Cl2 (3 mol Cl2)((35.453 g Cl2)/(1 mol Cl2)) = 106.359 g Cl2 2- The mas of C (1.25 mol TiO2) ((1 mol C)/(1 mol Tio)) =...

From wiki A percentile (or centile) is the value of a variable below which a certain percent of observations fall. So the 20th percentile is the value (or score) below which 20 percent of the observations may be found. The term percentile and the related term percentile rank are often used in...

Homework Statement If a 30 percent of a reference group scored higher than you did on a test, your score would be: a)at the 30th percentile b)at the 70th percentile c)at the 71st percentile d)at the 29th percentile e)indeterminate from the available informationHomework Equations I think it is c...

. You swing a 55-g mass on the end of a 0.75-m string around your head in a nearly horizontal circle at constant speed, as shown in Figure 11-16. a. How much work is done on the mass by the tension of the string in one revolution? b. Is your answer to part a in agreement with the...

An electric pump pulls water at a rate of 0.25 m /s from a well that is 25 m deep. The water leaves the pump at a speed of 8.5 m/s. 1. What power is needed to lift the water to the surface? 2.The necessary increase in power the pump to make the water flowing through it quickly 8.5m/s my...

Hi my question is What is the molar mas of: Sr(NO3)2 1 mol Sr ((87.62 g Sr)/(1 mol Sr)) = 87.62 g 2 mol N ((14.007 g N)/(1 mol N)) = 28.014 g 6 mol O ((15.999 g O)/(1 mol o)) = 95.994 g The molar mas is (87.62 g + 28.014 g + 95.994 g) = 211.628 g

In the book the answer was 1.5 seconds. but how they answer it I don't know

yeh (velocity + 9 m/s and the final velocity - 4 m/s) but my answer is wrong because the time is not positive can anybody help me ?!

Hi my question is : Moving the body mass was affected in 5 KG force of 20 Newton in a counter direction to the direction of movement if the speed 4 m / s. Calculate the time of the impact of this force is it right? pi= mvi = (5)(9)=40 kg.m|s pf= mvf = (5)(-4)=-20 kg.m|s t = (pf - pi)|f =...

hi my question is : A 85-kg diver walks to the end of a diving board. The board, which is 3.5 m long with a mass of 14 kg, is supported at the center of mass of the board and at one end. What are the forces on the two supports? answer it with drawing please

Hello, I have solved the following problem but my answer does not matched with the answer which is written in the book. My answer is 32 m/s but the answer of the book is 37 m/s [PLAIN]http://img842.imageshack.us/img842/6706/projectile.png Could anyone please show me where my mistake is...

Homework Statement Two finite arithmetic sequences : 1, 8, 15, 22, ... , 2003 2, 13, 24, 34, ... , 2004 HOW MANY TERMS THEY HAVE IN COMMON ?? I don't want the answer ! I want to know how to deal with this type of questions ? Homework Equations The Attempt at a Solution

Thanks for your fast reply. 2. so it's false MCQ ?!

Homework Statement Hi All, I have two MCQ, I could not answer them. All choices seem to be close to each others. I would be so grateful if you could help me. When the compression and expansion is very rapid, the sound is said to be high in: a) amplitude b) pitch c) frequency d)...

Homework Statement (1) A sound wave is traveling through air medium, if the medium is replaced by water, how that will affect the wavelength, frequency and speed of the wave ? (2) If the temperature of the air changed, how that will affect the wavelength, frequency and speed of the wave ...