Thursday

February 23, 2017
Total # Posts: 129

**Science**

How many moles of mercury will be produced by electrolyzing 1.0M Hg(NO3)2 solution with a current 2.00A for 2 hours.

*February 20, 2017*

**physic**

a cold drink bottle of 500 ml weight 25g .when a liquid is filled in it ,it weight 80g .find the density of liquid .

*October 19, 2016*

**s.g (math)**

if a triangle with sides 12 unit and 5 unit is inscribed in a circle with BC as diameter, then find the value of sin square theta +cos square theta -1

*September 10, 2016*

**real analysis**

Arbitrary union of closed set is closed Prove or disprove

*August 27, 2016*

**real analysis**

Closure of the set of irrational number is phi

*August 27, 2016*

**mathematics**

2cosx=√2+√2+2cos4x

*August 1, 2016*

**math**

A park is in the form of a rectangle 100 m×80 mat. At the centre of the park there is a circular lawn. The area of the park excluding the lawn is 4150 m^2 find the radius of the circular lawn

*June 7, 2016*

**math**

a body is projected at an elevation alpha with a velocity of 9.8m/s in what time Wii be direction of motion be alpha/2?

*May 7, 2016*

**math**

Roger buys six 1.5- litre bottles of fresh juice. he distributes 20 cl of juice to each of his pupils. calculate the number of pupils in his class if 600 ml is left.

*May 2, 2016*

**physics**

A river flow of width 100 m is flowing with velocity of 1.5 m/s .A man start from one end with rest relative to river .He raws with an acceleration of 2 m/s^2 relative to the river if the man want to cross river in minimum time by how much distance will he be drifted in the ...

*April 13, 2016*

**Stats/Probability**

If 23% of the cars that pass by your house each day are red, 12% green, 4% yellow, and 31% black; what is the probability the next car to pass your house will be red or yellow? (Assume every car is only a single color). I have to pick which formula to use. These are the ...

*February 20, 2016*

**math**

In a test which had 30 questions carrying 1 mark each ajay scored 60persant marks. How many questions did he answered correctly

*December 8, 2015*

**science**

How food travels through various compartments

*July 17, 2015*

**math**

What should be added to (2/3+3/5) to get -2/15

*July 8, 2015*

**math**

Evaluate 6/7-2+-7/9+19/21

*July 8, 2015*

**maths**

Solve and verify 7/x+35=1/10

*July 8, 2015*

**maths**

Solve : 1/x+1+1/x+2= 2/x+10

*July 8, 2015*

**math**

The product of two rational numbers is -28/81 if one number is 14/ 27 find the other

*July 8, 2015*

**maths**

The sum of two opposite angles of a parallelogram is 130 find all the angles of the parallelogram

*July 8, 2015*

**maths**

Abcd is a rectangle with <bac= 32 determine<dbc

*July 8, 2015*

**math**

Shreya walks 2/3 km to her school and rosy walk 3/4 km to the school who has to walk a longer distance to reach the school and by how much

*July 5, 2015*

**Maths**

A hand fan is made by stitching 6 equal size triangular strips of two different types. The dimensions of equal strips are 25cm, 25 cm and 14 cm.Find the area of each type of paper needed to make the hand fan.

*June 18, 2015*

**physics**

What is the value of current when charge of 5 uc paases through a conductor in 2seconds

*May 22, 2015*

**chemistry**

when x gram of carbon is completely burnt in certain amount of oxygen y gram of carbondioxide is form.what mass of Co2 will be produced when 2x gram of carbon is burnt in z gram of oxygen. which law of chemistry will help me to find the answer

*November 6, 2014*

**Physics**

An ant climbs onto the side of a bicycle tire a distance of 40.0 m from the hub. If the 0.010 g ant can hold onto the tire with a force of 4.34*10 to the -4, at what frequency would the tire fling the ant of assuming the wheel is spun on a horizontal plane? so what I did for ...

*November 2, 2014*

**Physics**

Determine Centripetal Acceleration acting on the person standing at the equator? (the radius of earth is given)

*November 2, 2014*

**math**

Yasmin wants to serve 150ml of juice to each of 15 guests. How many 500ml cartons of juice she buy? How much juice will she be left after serving her guests?

*September 22, 2014*

**Physics**

An airplane has an airspeed of 770 kilometers per hour at a bearing of N 48 degrees E. If the wind velocity is 28 kilometers per hour from the west, find the angle representing the bearing for the ground speed? I found Rx and Ry which are 543.23 and 572.22 respectively. To ...

*September 3, 2014*

**algebra**

22<40-18t<31 subtract 40 from all sides and then divide by -18. Flip the signs afterwards.

*September 3, 2014*

**ENGLISH**

can someone read my english essay and correct it for me?

*August 28, 2014*

**math**

There is no underlined digit

*August 28, 2014*

**statisticsmath**

0.2534,48.095

*August 21, 2014*

**quantitative techniques**

full solution od this question

*August 9, 2014*

**Physics**

An object of mass 0.5 kg is whirled at the end of a string 0.8 m long.If the string makes three revolution in 1.2 s,find the tension in the string.

*July 18, 2014*

**science**

an aircraft travelling at 600km/hr accelerates steadily at 10 km /h every second. Assuming speed of sound is 100 km /h t the aircrafts altitude , how long will it take to reach the sound barrier

*April 23, 2014*

**proposal writing for high school english**

how to write a proposal in brief for a 10 marks question? What structure should be followed for just 10 marks?

*September 30, 2013*

**Solid Mechanics**

99.2mpa

*August 13, 2013*

**chemisry**

Q2. Distinguish between the following- 1. CH3OH and C2H5OH 2. Phenol and methanol 3. 1-Propanol and 2-Methyl-2-propanol 4. Ethenol and 1-propanol 5. Propanol and propanone 6. Acetaldehyde and benzaldehyde 7. Benzaldehyde and benzoic acid 8. Propanoyl Chloride and propanoic ...

*July 7, 2013*

**Math**

When doing translation you have to write for example A(1,1) then when you write it you write A'(2,2) how would you write it to the fourth. Would you tally or do Roman numerals

*December 10, 2012*

**Math**

determine the value of k for which the fuction f(x)=4x^2-3x+2kx+1 has 2 zeros.

*October 21, 2012*

**Math**

hi in which standard r u , its just a simple sum , that means a very stupiod person is trying it out , but well i am the topper of the class i know this question well i am neha

*September 15, 2012*

**math 12**

A)a shed, in the shape of a square based prism, is to have volume 800meters cubed. determin the dimentions of the shed, with the minimum surface area. B)how would the answer change if the minimum surface area did not include the bottem of the shed? explain.

*September 14, 2012*

**math**

find the volume of cube,one face of which has an area of 64 m square

*July 14, 2012*

**math g 11**

the kwans will need $50,000 in 3years to expand their business. what is the equivalent value today if inflation is projected to be approx 3.5% per year compounded anualy

*May 15, 2012*

**grade 11 math**

at giant tv sales, you can chose between 2 payments options for a new tv. 1st option is 2 pay $2399.99. 2nd option is to pay a $399.99 downpayment plus $2200.00 after one year. if interset is 4.2% per year, compunded quarterly, wich option is a better deal

*May 15, 2012*

**physics**

1.1multiple10mines cube

*February 15, 2012*

**Chemistry**

What you can predict about a reaction whose activation energy is zero?

*February 6, 2012*

**Chemistry**

On the basis of MOT, explain why the stability of N2 decreases on ionization but the inverse is true for O2.

*February 6, 2012*

**Chemistry**

Why Energy of is smaller than π2px and π2py in case of O2 but it is opposite in case of N2.

*February 6, 2012*

**Chemistry**

Determine the mass of CuSO4.5H20 needed to make 100.00mL of a .100M CuSO4.5H20 aqueous solution..

*February 2, 2012*

**application of derivatives**

The radius of an air bubble is increasing at what rate is the volume of the bubble increasing when the radius is 1 centimetre?

*January 3, 2012*

**Physics**

9m/s

*November 30, 2011*

**chemistry**

What is the largest amount of H2O in grams that can be formed when 5.70 g of H2 reacts with 5.70 g of O2, based on the balanced reaction below. 2 H2 + O2 2 H2O

*November 26, 2011*

**physics**

the magnitude of 2 vectors are 4 and 5 units and the angle b/w them is 30,taking first vectoron x-axis.find the magnitudeof resultant vectorand its direction?

*November 24, 2011*

**Chemistry**

2 NO + O2 --> 2 NO2 The reaction rate is increased fivefold when the temperature is increased from 1400 K to 1500 K. What is the activation energy for the reaction?&...

*November 16, 2011*

**Chemistry**

The iodide ion can be oxidized in an acidic solution by hydrogen peroxide. One proposed mechanism for the reaction is as follows: Step 1: H2O2 (aq) + I-(aq) → H2O (l) + OI-(aq) slow Step 2: H+(aq) + OI-(aq) → HOI(aq) fast Step 3: HOI (aq) + H+(aq) + I-(aq) → ...

*November 13, 2011*

**Math**

10:00

*November 7, 2011*

**Physics**

I saw a video in class that only had the backwards ball involved, and the backwards ball didn't move at all. So I'm wondering what the effect of the forward ball does to the problem.

*October 27, 2011*

**Physics**

You are riding on a flatbed truck moving at 50 kilometers per hour. You have two identical guns, one aimed forward and one aimed backward, and you fire them at the same time. According to an observer in the ground, 1. the backward bullet appears to move faster. 2. they both ...

*October 27, 2011*

**Chemistry**

Rank the following solutions in order of increasing acidity. 1 M phenol 1 M boric acid 1 M cyanic acid 1 M formic acid 1 M hydrochloric acid 2. Rank the following solutions in order of increasing basicity. 1 M C3H5O3Na 1 M KF 1 M KOCN 1 M KOCl All I know is that HCl is the ...

*October 23, 2011*

**Physics**

A high diver of mass 69.4 kg jumps off a board 9.6 m above the water. The acceleration of gravity is 9.8 m/s2.If his downward motion is stopped 2.21 s after he enters the water, what average upward force did the water exert on him? Answer in units of N

*October 15, 2011*

**Physics**

that's what i did before, and it's still wrong

*October 13, 2011*

**Physics**

i redid it and got 1.205 which is wrong. can someone please help me?

*October 13, 2011*

**Physics**

I know that coefficients generally don't exceed 1, so I have no idea what to do

*October 13, 2011*

**Physics**

i got 26.95...seems high

*October 13, 2011*

**Physics**

oh wait nvm it can be N b/c force of gravity = weight

*October 13, 2011*

**Physics**

Sorry where it says ik it should be the microsign and then k

*October 13, 2011*

**Physics**

A box of books weighing 303 N moves with a constant velocity across the floor when it is pushed with a force of 400 N exerted down-ward at an angle of 38.6 degrees below the horizontal. Find ìk between the box and the floor. Well I know that I have to use netF = ma, so ...

*October 13, 2011*

**physics**

so Fg = 75*9.81 = 735.75 N Fnet = ma Fair - Fg = ma 96 - 735.75 = 75 * a a = -8.53 m/s2 Vf2 = Vo2 +2ax Vf2 = 0 + 2(-8.53)(-30) Vf2 = 511.8 Vf = -22.63 m/s //neg b/c downward direction

*October 11, 2011*

**physics**

A 100g golf ball moving with a velocity of 20 m/s, collides with an 8 kg steel ball at rest,if the collision is elastic,compute the velocities of both balls after the collision.???

*September 13, 2011*

**physics**

A 100g golf ball moving with a velocity of 20 m/s, collides with an 8 kg steel ball at rest,if the collision is elastic,compute the velocities of both balls after the collision.

*September 13, 2011*

**numericals**

A 100g bullet is firred from a 10 kg gun with a speed of 1000 m/s.What is the speed of recoil of the gun.

*September 12, 2011*

**Physics**

1. Question: Consider two planets with uniform mass distributions. The mass density and the radius of planet 1 are p1 and R1, respectively, and those of planet 2 are p2 and R2. What is the ratio of their masses? Ans: M1/M2 = (p1/p2)(R1/R2)^3...I got this answer correct. I need...

*August 28, 2011*

**Chemistry**

But I thought that CO2 could be like O=C=O, O-C=-O, and O=-C-O. Thank you though, for your input. :) I'm sorry about just posting the questions again.

*August 11, 2011*

**Chemistry**

Sorry. Well, I know that CO2 has resonance forms, but SO3 and HCO2 have resonance forms too. So that's why I don't get which one is the answer because all of them have resonance forms. I guess I just don't understand the "hybrid" part of the question, ...

*August 11, 2011*

**Chemistry**

Which of the following substances exist(s) as a resonance hybrid? CO2 (g) SO3 (g) HCO2- (aq) A. I only B. II only C. III only D. I and II only E. II and III only Ans w/i 12 hrs please!!

*August 11, 2011*

**Chemistry**

I got 2.67 and 5.33 (b/c I did 3x = 8 atm (2x for NH3 and x for N2). Is that on the right track?

*August 10, 2011*

**Chemistry**

Thanks for question 1. So what would the partial pressure be for the gases?

*August 10, 2011*

**Chemistry**

Nitrogen and hydrogen, with volumes of 12.0 L each, are injected into a sealed rigid reaction chamber containing a catalyst. The pressure of the chamber is 8.00 atmospheres and at a known temperature. The reaction is allowed to proceed to completion while being maintained at a...

*August 10, 2011*

**Chemistry**

92.01 grams of N2O4 (g) is placed in a container and allowed to dissociate. N2O4 (g) --> 2NO2 (g) The mixture of N2O4 and NO2 resulting from the reaction occupies 36.0 liters at a total pressure of 773 mmHg and 45 °C. A. Let x equal the moles of N2O4 that dissociate. ...

*August 4, 2011*

**Chemistry**

For each compound, draw a line structural diagram of all isomers. Identify the kind(s) of isomers illustrated. A. CH3CH=CHCH3 B. C3H7OH C. CHIFCl

*July 27, 2011*

**Chemistry**

What type of isomers are [Pt(NH3)2Br2]Cl2 and [Pt(NH3)2BrCl]BrCl? A. Structural B. Geometric C. Linkage D. Coordination E. Optical

*July 27, 2011*

**Chemistry**

Ok. Thanks once again!

*July 14, 2011*

**Chemistry**

But one of these has to be the answer.

*July 14, 2011*

**Chemistry**

You want to determine the molar heat of solution of sodium chloride using a 10.0 g sample of NaCl(aq) and 50.0 mL of water in a coffee cup calorimeter. Which of the following equations would you use? Assume the specific heat of the solution is the same as the specific heat of ...

*July 14, 2011*

**Chemistry**

Thanks!

*July 10, 2011*

**Chemistry**

In regards to DrBob222, there were 3 parts to this question; the first part said there were .1952 g and the mols were 2.504 * 10^-3 mol. But I don't know if this part refers to the first part because it doesn't sound like it does.

*July 10, 2011*

**Chemistry**

2NaF + CaCl2 ¨ CaF2 + 2NaCl An excess of 0.20 M NaF is used to precipitate the calcium ions from a 50.0 mL sample of a calcium chloride solution. What is the concentration of the original calcium chloride solution?

*July 10, 2011*

**chemistry 101**

8.75/34.02 (molar mass of H2O2) = .257 mol H2O2 Since the mol ratio b/t H2O2 and O2 is 1:1, there is also .257 mol O2 .257 mol * 6.02 * 10^23 = 1.55 * 10^24 molecules so the 3rd option.

*July 8, 2011*

**AP Chemistry**

2 Al + 3 Cu(NO3)2 --> 2 Al(NO3)3 + 3 Cu 1. Write balanced equations for the oxidation and reduction half-reactions. Identify each half-reaction as oxidation or reduction. 2. In the balanced overall reaction, determine which is the oxidation and reduction agent. 3. Which ...

*June 24, 2011*

**Science**

SORRY # 3 DOESN'T COUNT!!!

*January 17, 2011*

**Science**

1. I got a list of solutions. We did a test in the lab to figure out what was there pH. How do you figure out which one is the most acidic and the most basic? 2.When might you need to know whether a solution is acidic or basic? 3. Dishwasher detergent, oven cleaner, and drai

*January 17, 2011*

**PreCalc**

A contractor plans to build an artist's studio with a roof that slopes differently on the 2 sides. On one side, the roof makes an angle of 33 degrees with the horizontal. On the other side, which has a window, the roof makes an angle of 65 degrees with the horizontal. The ...

*January 3, 2011*

**chemistry**

The right answer is b. OH- and SO32-

*April 23, 2010*

**maths**

The mean of 10 observations is 21. If each score is divided by 3, find the new mean.

*March 17, 2010*

**chemistry**

A 1.994 g sample of gypsum, a hydrated salt of calcium sulfate, CaSO4, is heated at a temp. above 170 C in a crucible until a constant mass is reached. The mass of anhydrous CaSO4 is 1.577g. what is percent by mas of water in the hydrated calcium sulfate salt

*February 9, 2010*

**social studies**

Between 1935 and 1957, a period that included World War II, the birth rate rose from 16.9 to 25 per 1000 people. What was the most likely cause of this "baby boom?"

*January 6, 2010*

**7th grade**

ex; 6o/10 = 30/5 20/40=10/20

*October 13, 2009*

**college physics**

the question is that what happened when the ozone layer becomes destroyed?

*September 18, 2009*