# Posts by shreya

Total # Posts: 270

**Science, Maths**

A block and tackle of 5 pulleys is used to raise a load of 5o kgf steadily through a height of 20m. The work against friction is 2000J.Calculate the work done by effort, efficiency and mechanical advantage.

**Physics**

The length of wire is 25.5cm and it's radius is 1.02mm. Calculate the percentage error in mesurement of its volume

**Maths**

Devide the sum of 5/21 and 4/7 by their difference

**Physics **

A child leaves her book bag on a slide. The bag, which is at the top of the slide, starts from rest and reaches the bottom in 1.63 s. The mass of the book bag is 2.55 kg, the length of the slide is 2.90 m and the angle of incline is 35.0°. (Assume the +x-axis to be ...

**Science**

Why the ball of ventrical is thicker than the ball of atrium

**Maths**

Why the ball of ventrical is thicker than the ball of atrium

**physics**

a uniform meter rule is pivoted at 20cm mark . It is balanced when mass of 100gm on 10cm mark and mass of 50 gm on 30 cm mark are suspended. Find d mass of meter rule

**Maths**

A circular park of 28 m diameter has been constructed. A 3.5m circular track outside has been developed along the park. Using algebric formulae, find the area of the track around the park.

**math**

I bought 12 dozens of eggs at Rs 7.20 per dozen .Eighteen eggs were broken .I sold the remaining eggs at the rate of Rs 7.50 per dozen .find my gain or loss.answer is Rs 7.65

**Science**

How many electrons are present in 0.01 moles of sulphate ion

**English**

I sing a song Ramu went abroad Remove the furniture from here One of the boys is tall

**maths**

ABCD is a parallelogram in which the adjacent angles are (4x – 15)and (5x – 3). Find the measure of all the angles of the parallelogram.

**math**

Two 5-digit numbers have the same sum of digits: 2. The largest possible difference between two such numbers has the sum of digits: A 1 B 9 C 18 D 27 E 36

**Physics**

A bullet is moving with velocity u after emerging from a plank its velocity reduces by u/20 then find the total number of planks required to stop this bullet?

**math**

we know that perimeter of rhombus=area / altitude =139.2/9.6 =14.5 perimeter = 4a =4(14.5) =58cm

**Biology (High school science)**

If non-nucleated cells of meristematic tissue are used for tissue culture, then growth rate will be : a) High b) Average c) Very low d) Growth may not take place. Please help!

**English grammar**

In question 1, am I allowed to write "took" in the last blank? Why/ Why not?

**English grammar**

If yes, why?

**English grammar**

What if one of the options was "the one most expensive" then which one would be correct?

**English grammar**

Then is option b) correct?

**English grammar**

Fill in the blanks with appropriate form of verb (past tense) The jewellery _____(be give)to her by her husband, who _____ died some years before. Since his death, she did not have the heart to wear it, yet she did not want to sell it. Now it seemed that fate ____ (Take) the ...

**English grammar**

Punctuate: My orchard was often robbed by schoolboys and my wife's custards plundered by cats. I think the answer would be: My orchard was often robbed by schoolboys; and my wife's custards, plundered by cats. Am I correct? Why/ Why not?

**English Grammar**

Please explain adverb phrases, prepositional phrases, verb phrases, noun phrases and adjective phrases along with examples. 2) "How is the weather today, Sam?" said Jonh. Why isn't a comma required before "said John?"

**English grammar**

1) Observe the relation and fill in the blanks. food:crude:: should: ____ (I think the answer could be prude but it could also be would, could etc. I considered these answers because all of them rhyme with should just like crude rhymes with food. But there might be some other ...

**English grammar**

1) If it rained heavily, the reservoirs______ full. Use the right form of verb to fill in the blanks. a) will be b)would be c)would have been d) will have been (I think the answer is option b). Am I correct?)

**English grammar**

But why isn't a comma required before "said John?"

**English grammar**

Is there any particular rule for why there is a comma after today?

**English grammar**

Then is it "How is the weather today, Sam?" said John.

**English grammar**

Punctuate the following sentence: How is the weather today Sam said John. I think the punctuated sentence would be: "How is the weather today Sam?" said John. I am not sure if there is a comma before Sam and said. Am I correct? Please help!

**English grammar**

Thank you!

**English grammar**

"Fame shall sound thy praise from sea to sea". Can this be considered an example of personification?

**English grammar**

Then the answer is definitely option c). Thank you so much!

**English grammar**

Then it must be option c) because option a) has "he ran" and "he failed" option b) also has "he ran" and "he failed" (2 subjects and 2 verbs) Can you please tell me how to identify and differentiate between complex and compound sentences...

**English grammar**

How can the answer be option a) b) C) because I checked the definition of simple/complex/compound sentence elsewhere and noticed that compound sentences have an ordinating conjunction and complex sentences have a subordinating conjunction. In that case, wouldn't option a) ...

**To Reed**

Is it option d) then?

**English grammar**

Which of the following is a simple sentence? a) He ran fast but he failed to win the prize. b) Although he ran fast he failed to win the prize. c) In spite of running past, he failed to win the prize. d) He failed to win the prize because he did not run fast. Give reasons also.

**English grammar**

Then is the answer "are"?

**English grammar**

I think the subject is singular but I am not sure. What I want to know is Honour and reputation considered as one object or different objects?

**English grammar**

Honour and reputation (is/are) dearer than life. Suitable form of verb is:

**Math**

(3-4sin^2A)(1-3tan^2A) =(3-tan^2A)(4cos^A-3)

**rd. math**

Sol: HCF of 180, 252 and 324: 324 = 1 x 180 + 144 180 = 1 x 144 + 36 144 = 4 x 36 + 0 So, HCF of 324 and 180 = 36 HCF of 252 and 36: 252 = 7 x 36 + 0 So, HCF of 252 and 36 is 36. Hence, the HCF of 180, 252 and 324 is 36.

**Maths**

theo invests £800 in an account that pays 2% simple interest each year how much interest is earned in a year how much there will be in the account after 5 years how much will there be in 10 years

**physics**

A river is flowing along the east direction with a velocity of 10km/hr. A person heads towards north with a velocity of 2km/hr. what is the velocity of the person with respect to ground?

**phy111**

1.5 m

**chemistry**

What must be the velocity of a beam of electron if they are to display a de broglie wavelength of 1A°?

**math**

oo hanks i am doing this sum form hours to hours .ur great

**Ms sue please help**

Thanks a lot Writeacher :)

**Ms sue please help**

Hey ms sue can you please help me to simplify this paragraph? Raynaud's disease occurs when the small arteries (arterioles) that serve the fingers, toes, ears, or nose go into spasm. When arterioles go into spasm, they cut off blood supply and cause digits (fingers and ...

**Raynaud's**

I want to know what Raynaud's basically is. I know that blood flow is stopped to the fingers and toes, because blood vessels tighten or something when they are exposed to cold, and there are other factors as well.

**Raynaud's**

Hey I want to shorten this paragraph out which tells what Raynaud's is, can anyone please simplify it and make it shorter thanks? Raynaud's disease occurs when the small arteries (arterioles) that serve the fingers, toes, ears, or nose go into spasm. When arterioles go...

**Biology Raynaud's Disease**

Hey im doing a powerpoint presentation on this raynaud's disease, and could someone please give me some good sites to go through to get info abt this and please mention anything you know about the raynaud's disease as well, thanks.

**Biology - URGENT Enzyme Lab**

Did a catalase producing hydrogen peroxide lab, used manganese dioxide, fresh frozen liver, potato, ice, fine clean sand, etc. Basically just added hydrogen peroxide to the catalysts under diff conditions and stuff. Just don't get this question which is : how do you ...

**Biology Difference b/w Heat Exhaustion/Heat Stroke**

I want to know the causes of heat stroke and heat exhaustion. I cant seem to find separate causes for the two, finding very different answers online :|

**Biology**

Hey I am doing a lab, the link is down h t t p : //w w w . sd67 . bc . ca/schools/salc/biology%2012/module%20c%20-%20human%20biology/unit%2010%20-%20respiratory%20system/Homeostasis%20Lab .pdf And I really would like help with #1 My data is right here Pre exercise 0 min - Temp...

**Chemistry 12**

which of the following 0.10M solutions is basic? A LiCl B K3Po4 C NaCLO4 D NH4NO3 Is it C?

**Chemistry 12**

Thank you soo much :) I can totally see you as a smart Chemist in the future :)

**Chemistry 12**

Thank you soo much, that makes so much sense :)

**Chemistry 12**

define the term strong bronsted lowry acid it is 100% ionized in solution? is that it?

**Chemistry 12**

name a compound that acts as a weak base? methanol? define the term weak bronsted-lowry base im not sure how to put this in words, but a weak base is found when you got a strong acid, when your ka is high, kb will be low.

**Pre Calculus 12**

Oh but this is a multiple choice question and the only answers that it can be are A 144 B 72 C 24 D 1728

**Pre Calculus 12**

permuations an orchestra has 2 violinsts, 2 cellisst, and 4 harpists. Assume that the players of each instrument have to sit together, but they can sit in their own group. In how many ways can the conductor seat the members of the orchestra in a line? I just went 4*3*2 and got...

**Chemistry 12**

Thanks soo much to both of you :)

**Chemistry 12**

Thanks so much :) So if we were to find the Ka, then we would use the ka on the acid side of the chart?

**Chemistry 12**

How do you know which ka to use? There is one on the base side of the chart, and one of the acid side of the chart. For the one of the acid side of the chart, the Ka is 2.2*10^-13 And for the one on the base side of the chart, it is 6.2*10^-8.

**Chemistry 12**

The value of Kb for HPO₄²- is? A. 2.2*10^-13 B. 6.2*10^-8 C. 1.6*10^-7 D. 4.5*10^-2 I don't get how to solve this.

**Chemistry 12**

Aww thanks soo much buddy :)

**Chemistry 12**

The [OH-] of a solution with a PH 5.75 is is it 5.6*10-9M?

**Pre Calculus 12**

Oh that makes sense, thank you :)

**Pre Calculus 12**

Identify the point on the unite circle coressponding to an angle of 300 degrees in standard position A (-√3, -√3/2) B (-√3/2, 1/2) C (1/2, -√3/2) D (1/2, -√3 ) I don't get how to figure this out :|

**Pre Calculus 12**

Another sine/cosine question i don't get in vancouver on certain day, high tide is 20m at 2am, the next low tide is 8m at 6am, what an equation that represents height (h)of water at any time (t)since midnight) what is the height of water at 8:45AM? What is height of water ...

**Pre Calculus 12**

Modelling with sine/cosine A Ferris wheel has a diameter of 30m. The bottom of the wheel is 1.5m off the ground it takes 3.5min to make one complete revolution. a person gets on ferris wheel at its lowest point at time = 0. write an equation that represents persons height ...

**Pre Calculus 12**

The height h, in metres, above the ground of a car as a ferris wheel rotates can be modelled by the function h(t) = 18cos(πt/80) +19 what is the minimum height of a car? do i like subtract 19 from 18 ? what is the maximum height of a car? do i add the 19 to 18? how long ...

**Pre Calculus 12**

so you added 10 and 2 to get 12, and amplitude is the middle of max and min? how did you get the axis 4 units? a period is always twice of something? the phase shift is sort of confusing me, because isnt that just between the x values? 2, and 5? is there some other way to ...

**Pre Calculus 12**

Graphing trigonometric functions A sinusoidal function has a maximum at (2,10) and its next minimum (5,-2) find an equation that represents this situation A sinuosoidal function has a zero at (5,0) and its next minimum is (7,-4). find an equation that represents this situation...

**Pre Calculus 12**

Thanks very much Reiny :)

**Pre Calculus 12**

Laws of logarithms evualuat using change of base rule log(√8)16 ^the square root 8 is supposed to be subscript. the answer i got was 8/3, not sure if that is right

**Pre Calculus 12**

thanks soo much Reiny :) You are such a great math helper on here! :D

**Pre Calculus 12**

how do i log both sides? divide by 2000 on both sides?

**Pre Calculus 12**

Solving problems that involve logarithms the sound at a rock concert decreases by 10% for every 5m travvelled. how far does it take for a volume of 2000 decibels to decrease to 20 decibels? i don't know what to do for this one the growth decay formula i got is A = P(X)^t/n...

**Pre Calculus 12**

Thanks very much Reiny :)

**Pre Calculus 12**

Laws of Logarithms Evaluate: without using a calculator, except for the first one. The 5.6 is supposed to be subscript, but i don't know how to make it small. 4log(5.6)84 log84/log5.6 Do I multiply this by four or something? both of the logs?

**Pre Calculus 12**

How is 5y-3 is a common denominator?

**Pre Calculus 12**

Could you explain why it wouldnt be 1/5x again? Because isnt there an invisible 1 beside the x, and so when we divide the 5 doesnt it become 1/5x? For the second equation to get rid of 5y-3 on the bottom you multiply it on the other side? Could you explain step by step the ...

**Pre Calculus 12**

Oh okay that makes sense, Im just sort of still confused with how the answer to the first one needs to be layed out I got y = ³√(1/5x) +3 And yes that is a new equation on my second post, and yeah I meant that, sorry will remember to put brackets next time.

**Pre Calculus 12**

And I do not get this one y = x-2/5x-3 x = y-2/5y-3 ?

**Pre Calculus 12**

Where did you get 4 from? For the first one? Where you wrote in original let x = 4?

**Pre Calculus 12**

I also do not get these inverses questions y = 5(x-3)^3 x = 5(y-33)^3 I divided 5 on both sides and got 1/5x = (y-3)^3 Then do I cube root the 1/5x or something to get rid of of the cubed on (y-3)? Also y = x-2/5x-3

**Pre Calculus 12**

Thanks Reiny that makes soo much more sense :)

**Pre Calculus 12**

For the second step, to get rid of a fraction on the bottom, we always multiply it with every term? And if we are dividing something, then we divide it by every term? K i get how you got 6, but I still don't get how to get the x+4 ?

**Pre Calculus 12**

thanks Reiny but the answer says y=3/2(x+4) is it supposed to be 6?

**Pre Calculus 12**

Im trying to find the inverse of this: y = 2/3x-4 I got to this step x+4 = 2/3y I need to divide by 2/3 to get rid of 2/3 beside the y, but i don't know how to divide x+4/2/3 that looks complicated :\

**Pre Calculus 12**

Im going over my pre calculus 12 exam, and I need help with one question from the chapter Transformations of graphs and stuff. Combining Transformations 2y = f(5x-10)+8 The original points are (4,6) and the new points I got by translating it and stuff are : (14/5,20) But in ...

**maths**

U+2085

**Pre Calculus 12 urgent**

andrew is working on a binomial problem (1/2x-y)^7. He asks u to : i) what the coefficient of the 6th term ii) find the term that has the variabes x^47^3 (ex. 34x^4y^3) iii) find the first three terms of the expansion I really need help with that ^ . I know the powers of A ...

**Pre Calculus 12**

Im on the chapter of permutations/combinations/fundamental counting principle need help with 2 questions 1. emma is arranging her books in piles on her desk. she has 5 math books, 3 english books, and 4 science books. how many ways can she arrange them if she wants to keep the...

**Pre-Calculus**

Same problem with this question The angle θ is in the fourth quadrant, and tan θ = -3/7. Point P is on the terminal arm of angle θ. Which is a possible coordinate for P? A) -21,9 B) 9,-21 C) -9,21 D) 21,-9

**Pre-Calculus**

The angle θ is in the second quadrant and tan θ = -3/5. Point P is on the terminal arm of angle θ/ Which is a possible coordinate for P? A) (-5,√29) B) (-3,√29) C) (-10,6) D) (-6,10) I drew the triangle, and aren't the coordinates supposed to be...

**Pre-Calculus**

Thanks so much :)

**Pre-Calculus**

Trigonometric Functions, Radian Measure ∏ <-- will be using this for pi Using exact values, convert to radians ( hint use fraction of ∏) 90° = 90°*∏/180° = 1∏/2 ^^would it be right to also call it 2∏ radians? Determine the angle at ...

**Pre-Calculus**

Applications of Logarithms I really need help with this log stuff please. If the PH of acetic acid is 5, what is the PH of hydrochloric acid if it is 200 times more acidic? the formula is right here: P=P0*10^PH2-PH1 200=10^5-PH1 log200=(5-PH1)log10 And I don't know where ...