# Posts by maryam

Total # Posts: 188

**Chemistry**

1.33dm3 of water at 70°C = 2.25moles of Pb(NO3)2 and 4.5dm3 of water contains x moles of the salt, by calculation, x=7.62 moles..likewise at 18°C, 1.33dm3 of water contains 0.53 moles of the same salt and at 4.5dm3 of water, it contains x..x is 4.5x0.53/1.33=1.79moles...

*March 20, 2017*

**help**

write about Smart hairbrush listens for breaking hair?

*March 6, 2017*

**maths**

show that 0.227272727272727 can written as a 3/11?

*February 25, 2017*

**Maths **

An arithmetic progression start 3+2a, 3+4a,3+6a if the fifth term is 73 work out value a?

*February 7, 2017*

**Maths**

Thanks

*February 7, 2017*

**Maths**

Solve 1/x +1/x+1=1 ?

*February 7, 2017*

**Maths **

You can buy x pencils for 80p How much will it cost to buy y pencils?

*February 7, 2017*

**maths**

find the average speed of 300km in 4 hours?

*January 9, 2017*

**math**

Can I double check this I'm not entirely sure if my answer is correct. What is the smallest perfect square that has a factor of 90. 8100?

*November 24, 2016*

**math-factors and multiples**

GCF of 40a^3 and 32a^2

*November 24, 2016*

**math**

Thank you so much. It's making more sense now

*November 24, 2016*

**math**

Wait. LCM= 2•3•5•a^2= 30a^2?

*November 24, 2016*

**math**

LCM of 10a and 15a^2 Factors of 10a are 10,a,2,5 but the prime factors are 2,5,a Factors of 15a^2 are 15,a^2, 3,5,a,a Prime factors are 3,5,a,a Common between two are 5 and a So is the LCM of 10a and 15^2 5a?

*November 24, 2016*

**I showed my work. and now I don't know what to do.**

My total surface area I found is 6833.458965cm2 But I need to subtract the overlapping or hidden sides. I need help on that

*October 27, 2016*

**math**

And since the circle of the cone is placed on top of the cylinder, do I do 2πr^2 since it covers 2 surfaces? Also for the hemisphere, I'm not understanding what formula to use since it is at the bottom of the rectabgular prism. They're connected.do I still use 3&#...

*October 27, 2016*

**math**

Now I have to find the overlap. So: Cone πr2= 50.26548246 And I don't get how to subtract the overlap of tye hemisphere

*October 27, 2016*

**math**

Rectangular prism: Sa= 2lw+2wh+2lh 2 (41)(20)+ 2 (20)(40)+ 2(41)(40) 1640+1600+3280 SA= 6520cm2 There's no overlaps for rectangular prism so it stays the same. Cone: SA= πrs+πr^2 π4×8.94427191+π4^2 112.3970357+50.26548246= 162.6625182cm2 ...

*October 27, 2016*

**math**

Surface area of a composite object. A cone with a slant height of 8.9cm and a radius of 4cm. The cones base is attached on top of a rectangular prism whose length is 41cm, width is 20cm and height is 40cm. It is attached with a hemisphere whose radius is 4cm. Find the surface ...

*October 27, 2016*

**biomechanics**

an orienteer runs 300m north and then 400m to the southeast (at a 45 degree angle to north). if he runs at a constant speed, how far away is he from the starting position?

*August 20, 2016*

**Waves and optics**

Find the binding energy per nucleon in J and eV for the three following isotopes, given their atomic masses in u: 22(A) 6(Z) of carbon 22.0572097 u

*May 20, 2016*

**maths**

how many 2/3L bottles can i completely fill from a 40L tank of water?

*March 28, 2016*

**maths**

point A(4,6) and point B(7,9) are connected by straight line .what is the length of the line?(Pythagoras)

*March 28, 2016*

**Physics**

The observed frequency of a train whistle is 513Hz as it approaches a stationary observer and is 432Hz as it recedes. Find the speed of the train

*March 16, 2016*

**Physics**

The 2nd harmonic of a string of length 60cm and linear mass density 1.7g/m has the same frequency as the 5th possible harmonic of a closed pipe of length 1.2m. Find the tension in the string.

*March 16, 2016*

**physics**

A police car moving at 75m/s is initially behind a truck moving in the same direction at 14m/s. The natural frequency of the car's siren is 1000Hz. What is the change in frequency observed by the truck driver as the car overtakes him?

*March 16, 2016*

**maths**

can anyone help me ,how i can find maths higher past paper of 4 November 2015 by Mr barton?

*March 16, 2016*

**Physics**

A police car approaches a large wall at 51m/s. Its siren emits a 980 Hz signal. What is the frequency of the reflected sound observed by the officer?

*March 10, 2016*

**maths**

show that 0.27 (both recurring) can be written as 3/11?

*March 7, 2016*

**math**

show that 0.27 (both recurring) can be written as 3/11?

*March 7, 2016*

**maths**

give tow angle rules that can only be used when we have parallel line and an intersecting line ?

*March 7, 2016*

**maths**

thanks

*March 2, 2016*

**maths**

anyone know which topics is on non calculator?

*March 2, 2016*

**English**

thanks

*February 29, 2016*

**English**

please help me , its level 2 trinity / esol skills for life level 2 i have reading and writing exam ,do you guys know Any good websites I can use to improve it? its will be descriptive text,explanatory text,persuasive text for writing ,formal litter,compiling litter , email ?

*February 29, 2016*

**English**

its level 2 trinity / esol skills for life level 2 no we not using any specific book its will be descriptive text,explanatory text,persuasive text for writing ,formal litter,compiling litter , email

*February 29, 2016*

**English**

please help me ,i am doing level 2 English and i have reading and writing exam ,do you guys know Any good websites I can use to improve it ?

*February 29, 2016*

**maths**

using the information that 3.19 x 78.3 = 217.871 calculate 0.319 x 7.83

*February 29, 2016*

**maths**

the diagram below shows a fair spinner with 6 equally sized sections .mike did an experiment and carried out n spins , the spinner landed on the number 5 a total of 37 times .estimate the value of n?

*February 22, 2016*

**maths**

thanks

*February 22, 2016*

**maths**

Kelly drives from town A to town B WITH an average speed of 30mph the journey takes her 2 hours 15 minus to get from town A to B .whats is the distance between the tow towns ?

*February 22, 2016*

**maths**

john thinks of 2 different numbers .they have a sum of 12 and a difference of 2 .what are tow numbers?

*February 22, 2016*

**maths**

Steve is trying to make the weight for a Boxing match. Steve needs to be 72kg or less for fight night. He is currently 79kg. His trainer tells him he can lose 4lbs a week comfortably. Given 1kg = 2.2lbs find how many weeks it will take Steve to reach his target weight of 72kg...

*February 8, 2016*

**maths**

thanks Damon 1 THING HOW COME 0.90?

*February 8, 2016*

**maths**

a car depreciates at rate of 10%per year. the car cost £20000 new. (a) explain why the car wont be worth £16000 after 2 years (b) show that the car will be worth £16200 after 2 years and find the value of the car after 3 years (c) describe the type of ...

*February 8, 2016*

**physics**

A particle moving in simple harmonic motion passes through the equilibrium point x=0, 3 times per second. At t=0 its velocity at x=−0.0325m is negative. It travels 0.5m in a complete cycle. a) what is the phase constant in cm. i found the equation: x(t)=12.5sin(3pi t +x...

*January 31, 2016*

**Math**

1.if 40% of pupils in a school are boys,what percentage of the pupils are girls? 2.increase 448 by 25% 3.decrease 20.00 by 5%

*January 18, 2016*

**Physics**

A police car approaches a large wall at 51m/s. Its siren emits a 980 Hz signal. What is the frequency of the reflected sound observed by the officer

*January 12, 2016*

**physics**

A block of mass m1=3.70kg on a frictionless plane inclined at angle 30 deg is connected by a cord over a massless, frictionless pulley to a second block mass m2= 2.30kg. What is... a) The magnitude of the acceleration of each block? b) The direction of the acceleration of the ...

*January 12, 2016*

**math**

Many people are trying to reduce their carbon footprint. Amrita’s carbon footprint this year was 85% of last year’s footprint. If her carbon footprint this year is 34 tonnes, what was her carbon footprint last year? please help!!!!

*November 30, 2015*

**math**

store that sells posters charges $ 7 a poster plus a fixed $ 1.50 for shipping and handling. *1*Write a rule c (p) that describes the relationship between the number of posters p and the total cost for the posters (c)? *2*What is the charge for four posters? *3* If the cost is...

*November 22, 2015*

**mba**

identify several ways you current use accounting information in student life

*November 6, 2015*

**grammar**

Last night, my brother Answer me a secret.

*February 20, 2015*

**math problem solving**

Rachel jogged alone a trail that was 1/4 of a mile long. She jogged along that trail 8 times. How many miles did rachel jog in all?

*January 22, 2015*

**math**

I. Need help in math

*January 19, 2015*

**math**

Fhjuydhrdtftddtdgt

*September 17, 2014*

**Trigonometry**

sin2A= 2sinAcosA now we know that cosA=-3/4, and theta is in the second quadrant so you sketch a triangle in the second quadrant, remember the bowtie method -3 is a leg and 4 is the hypotenuse based on sohcahtoa plug these two into the pythagorean theorem to find the missing ...

*April 18, 2014*

**physics**

an aluminium of mass 2.1 kg rests on a steel platform. A horizontal force of 15N is applied to block(a) given the coefficient of limiting friction is 0.61 will the block move? (b)if it moves what will be its acceleration?

*January 21, 2014*

**Physics**

Problem 1- A 4 kg puck can slide with negligible friction over a horizontal surface, taken as the xy plane. ˆ The puck has a velocity of 3i m / s at one instant ti = 0 . Eight seconds later, its velocity is to be ˆˆ 8i + 10 j m / s . Find the magnitude and ...

*November 18, 2013*

**Physics**

Problem 3- Blocks A, B, and C are connected by ropes and placed as in the figure. Both A and B weigh 22.6 N each, and the coefficient of kinetic friction between each block and the surface is 0.40. Block C descends with constant velocity. a) Draw free-body diagram of objects A...

*November 18, 2013*

**Physics**

A 4 kg puck can slide with negligible friction over a horizontal surface, taken as the xy plane. ˆ The puck has a velocity of 3i m / s at one instant ti = 0 . Eight seconds later, its velocity is to be ˆˆ 8i+10 j m / s . Find the magnitude and direction of the ...

*November 16, 2013*

**Physics**

The maximum possible value for the coefficient of static friction ?

*November 16, 2013*

**Physics**

An 100kg box is placed on the ramp. As one end on the ramp is raised the box begin to move down ward just as the angle of inclination reaches 15 degree . What the coeffenict of static friction between box and ramp .. ?

*November 16, 2013*

**Physics**

A500 man stands at the center of the rope such that each half of the ropes makes an angle of 10 with the horizentle . What is the tension of the rope ???

*November 16, 2013*

**Physics**

A15N crate rests on an ramp , the maximum angle just before it slips is 25 degree with the horizantle , what the coefficient of static friction between the crate and ramp surfaces ?

*November 16, 2013*

**Physics**

Thank you

*November 16, 2013*

**Physics**

Acceleration due to gravity on the moon's surface is 1/6th that on the earth . An object weight 900N on the earth . What does it weight on the moon ?

*November 16, 2013*

**Physics**

At t=0, a particle leaves the origin with a velocity 6m/s in the positive x direction and moves in the x-y plane with a constant acceleration (-2i-4j)m/s2 How far the particle from the origin at t=1 ?

*October 31, 2013*

**math**

two parallel chords lie on opposite sides of the centre of a circle of radius 13cm.their lengths are 10cm and 24cm. what is the distance between the chords

*October 26, 2013*

**Physics**

Problem 2- 1. As a ship is approaching the dock at 45 cm/s, an important piece of landing equipment needs to be thrown to it before it can dock. This equipment is thrown at 15.0 m/s at 60∘ above the horizontal from the top of a tower at the edge of the water, 8.75 m ...

*October 26, 2013*

**Physics**

Problem 2- A boat has a velocity of 0.54 m/s southeast relative to the earth. The boat is on a river that is flowing 0.60 m/s east relative to the earth

*October 25, 2013*

**Physics**

Help

*October 24, 2013*

**Physics**

Problem 1- A dog running in an open field has components of velocity vx = 2.2m/s and vy = -2.5m/s at time t1 = 12 s. For the time interval from t1 = 12 s to t2 = 24 s , the average acceleration of the dog has magnitude 0.55 m/s2 and direction 25.5∘ measured from the +x&#...

*October 24, 2013*

**Physics**

A students adds two vectors with magnitude of 200 and 40 , what is the resultant ?!

*October 17, 2013*

**Physics**

Ahmad throws a ball straight up. For which situation is the vertical velocity zero? [Note: Neglect the air resistance] Answer at the top on the way up none of the above on the way down

*October 3, 2013*

**Physics**

1)The speedometer on a car’s dashboard measure average speed average velocity instantaneous acceleration instantaneous speed 2)A car moving on a straight road increases its speed from 30 m/s to 50 m/s in a distance of 180 m. If the acceleration is constant, how ...

*October 2, 2013*

**Physics**

A rocket, initially at rest, is fired vertically with an upward acceleration of 10 m/s2. At an altitude of 500 m, find its velocity. 1000 m/s 500 m/s 100 m/s 10 m/s

*October 2, 2013*

**Physics**

Problem 4- Speedy car, driving at 30 m/s. The driver suddenly observes a slow-moving van 155 m ahead traveling at 5 m/s in the same direction. The driver of the car immediately applies the brakes causing a constant acceleration of 2 m/s2 in a direction opposite to the cars ...

*September 29, 2013*

**Physics**

Can I solve it in the equation of motion in one dimension ????

*September 29, 2013*

**Physics**

Problem 3- If a bug can jump straight up to a height of 0.5 m. a) what is its initial speed as it leaves the ground? b) How long is it in the air?

*September 29, 2013*

**Physics**

Thank you

*September 29, 2013*

**Physics**

Problem 2- A car is stopped at a traffic light. It then travels along a straight road so that its position from the light is given by x(t) 2.5t - 0.13t^2 in meters. c. What is the position of the particle when it reverses its motion?

*September 29, 2013*

**Physics plz**

Do any teacher here have an email plz becouse I want to send some pictures for question ,,, physics plz or how can I attach picture here ????

*June 12, 2013*

**Grammar**

1)answer : alternative and solution

*June 7, 2013*

**Grammar**

Solution-dependence-alternative (find) Answer:alternative and dependence Resources-technology-stocks(deplete) Answer:Resources and stocks Now is it correct ??

*June 7, 2013*

**Grammar**

Development-environment-figures. (Recent) Answer:development and environment Now ?

*June 7, 2013*

**Grammar**

Development-environment-figures. (Recent) Answer:environment and figures Situation-quantity-interest. (Sufficient ) Answer:quantity and interest Now is it correct ??

*June 7, 2013*

**Grammar**

Thanks a lot sir

*June 7, 2013*

**Grammar**

1)better 2)important 3)distinct (Advantages) Important and distinct Last choice

*June 7, 2013*

**Grammar**

Hhhhh yes becouse I don't know the rule

*June 7, 2013*

**Grammar**

1)affordable 2)rising 3)rapid. (Prices) Rising and affordable 1)better 2)important 3)distinct (Advantages) Better and distinct Now ?

*June 7, 2013*

**Grammar**

1)upward 2)growing 3)recent (Problem) Recent and growing 1)steady 2)severe 3)reliable. (Supply) Steady and reliable 1)available 2)increasing 3)public. (Concern) Public and increasing 1)immediate 2)effective 3)sufficient. (Solution) Immediate and effective 1)affordable 2)...

*June 7, 2013*

**Grammar**

1)upward 2)growing 3)recent (Problem) Recent and growing 1)steady 2)severe 3)reliable. (Supply) Steady and reliable 1)available 2)increasing 3)public. (Concern) Public and increasing 1)immediate 2)effective 3)sufficient. (Solution) Immediate and effective 1)affordable 2)...

*June 6, 2013*

**Grammar**

Can you tell me what's correct ?

*June 6, 2013*

**Grammar**

Circle the adjectives that can be used with the nouns on the right . 1)upward 2)growing 3)recent (Problem) Upward and growing 1)steady 2)severe 3)reliable. (Supply) Sever and reliable 1)available 2)increasing 3)public. (Concern) Available and increasing 1)immediate 2)effective...

*June 6, 2013*

**Grammar**

Development-environment-figures. (Recent) Answer:environment and figures Situation-quantity-interest. (Sufficient ) Answer:quantity and interest Now is it correct ??

*June 6, 2013*

**Grammar**

Circle the nouns that can be used with the adjectives on the right , Development-environment-figures. (Recent) Answer:development and environment Crisis-supply-estimates. (Reliable) Answer:supply and estimates Awareness-theory-concern. (Public) Answer:Awareness and concern ...

*June 6, 2013*

**Grammar**

Solution-dependence-alternative (find) Answer:alternative and dependence Resources-technology-stocks(deplete) Answer:Resources and stocks Now is it correct ??

*June 6, 2013*

**Grammar**

Thank you

*June 6, 2013*

**Grammar**

Circle the nouns that can be used with the verbs on the right . Engine-consumption-dependence (reduce) Answer : consumption and dependence Solution-dependence-alternative (find) Answer:solution and dependence Resources-technology-stocks(deplete) Answer:Resources and technology...

*June 6, 2013*

**Calculus**

(c) theline x=2 (d) the line y = −2

*June 5, 2013*