Tuesday
May 24, 2016

Posts by Maryam

Total # Posts: 166

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

grammer
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
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

Calculus
5. Find the volume of the solid generated by revolving the region bounded by y = x2, y = 0 and x = 1 about (a) the x-axis (b) the y-axis
June 5, 2013

Calculus
4. Find the volume of a pyramid of height 160 feet that has a square base of side 300 feet
June 5, 2013

Calculus
3. Find the volume of the solid with cross-sectional area A(x) = 10 e^0.01x, 0 ≤ x ≤ 10.
June 5, 2013

Calculus
Any answer
June 5, 2013

Calculus
(c) y=x2,y=2−x,and the vertical linex=2
June 5, 2013

Calculus
Find the integral of sin(x) cos(x)/sin^2(x)-4 dx
June 5, 2013

Calculus
(c) find the integral of 1/squrt (x^2+2x+10) dx
June 5, 2013

Calculus
(c) find the integral of e^x/ e^3x + e^x dx
June 5, 2013

calculus
(c) find the integral of e3x + ex dx
June 5, 2013

English
How ?
June 4, 2013

English
Circle the nouns that can be used with the adjectives on the right , Development-environment-figures. (Recent) Crisis-supply-estimates. (Reliable) Awareness-theory-concern. (Public) Region-prices-solution. (Affordable) Protection-needs-sanitation. (Adequate ) Situation-...
June 4, 2013

Grammar
Circle the nouns that can be used with the verbs on the right . Engine-consumption-dependence (reduce) Solution-dependence-alternative (find) Resources-technology-stocks(deplete) Quantity-problems-question(solve) Energy-crisis-shortage (face) Possibility-problems-century(...
June 3, 2013

Grammar
Circle the nouns that can be used with the adjectives on the right , Development-environment-figures. (Recent) Crisis-supply-estimates. (Reliable) Awareness-theory-concern. (Public) Region-prices-solution. (Affordable) Protection-needs-sanitation. (Adequate ) Situation-...
June 3, 2013

Grammar
From we're ?
June 3, 2013

Grammar
Circle the adjectives that can be used with the nouns on the right . 1)upward 2)growing 3)recent (Problem) 1)steady 2)severe 3)reliable. (Supply) 1)available 2)increasing 3)public. (Concern) 1)immediate 2)effective 3)sufficient. (Solution) 1)affordable 2)rising 3)rapid. (...
June 3, 2013

Physics
2-A 10.0 Kg block is released from point A in the figure below. The block travels along a smooth frictionless track except for the rough 1 m long portion between points B and C. It makes a collision with stationary 10 kg ball after passing point C. The ball moves forward with ...
June 2, 2013

Physics
1- A 5.0 kg block moving east with speed of 6 m/s collides head on with another 8.0 kg block moving west with speed of 4 m/s. After the collision the 5.0 kg block was moving west with speed of 5 m/s while the 8.0 kg block was moving east. a) What is the speed of the 8.0 kg ...
June 2, 2013

Calculus
1. Evaluate the following integrals (a) 􏰀 4x2 +6x−12 / x3 − 4x dx
May 26, 2013

Physics
3- A 5.0 Kg block is released from point A in the figure below. It travels along the smooth surface A  E except for the part B  C where the surface is rough. Point A is 3 m above the lowest point C. The block continues in its motion up the surface until reaches...
May 25, 2013

Physics
Please I need the answer
May 25, 2013

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