Wednesday
December 17, 2014

Posts by Mariam


Total # Posts: 104

math
You do cross out the zero. To not get confuse place the decimal in the right place.
November 29, 2014

earth science
The active sections that are located along fault lines are called
November 19, 2014

Physics
a car starts rest at 2m/s at a uniform speed of 5m/s(square) what is the time interval?
November 18, 2014

Physics
AN astronaut on the Moon has a mass (including his spacesuit and equipment) of 180 kg. the acceleration due to gravity on the Moon is 1.6 m/s2 (seconds squared). a) calculate his weight on the moon. the astronaut climbs 100m to the top of the crater . b) by how much does his ...
November 17, 2014

world problem
chloe collected 4 times as many bags of cans as her friend. if her friend collected 1/6 of a bag how much did chloe collect
November 10, 2014

Science
Ms. Sue
October 29, 2014

Science
.......
October 29, 2014

Science
How is potential and kinetic energy measured?
October 29, 2014

english
So i was reading an article and the question was ¨what heroic act did malala participate in? What does the question mean when it says 'heroic act ' thank you
October 1, 2014

math
i just need you to please give me tips and examples and maybe later i might tell you my answer to see if its correctp
October 1, 2014

math
hello im having problems with my math 1 Wells College in Aurora,New York was previously an all -girls college.In 2005,the college began to allow boys to enroll. By 2012, the ratio of boys to girls was 3 to 7. if there were 200 more girls then boys in 2012, how many boys were ...
October 1, 2014

science
Thank you so much
September 29, 2014

science
So the question is write down three examples of science in your everyday life. This was my answer: sound- compression wave, Baked goods- chemical reaction, Looking at mountains or ocean- earth science Please check my answer and see if this is good thank you
September 29, 2014

science
what are examples of science in your everyday life please help
September 29, 2014

Science
A ray of light approaches a jar of honey at an angle of 30.0 degrees. If the angle of refraction is 19.5 degrees, what is the refractive index of honey?
July 17, 2014

Science
What is the index of refraction of a material if the angle of incidence in air is 50 degrees and the angle of refraction in the material is 40 degrees? Please show steps.
July 17, 2014

Science
What is one qualitative factor and one quantitative factor that affect the refraction of light as it passes from one medium to another?
July 17, 2014

Calculus
Find the following integral ? How , is it by substitution !!!!!!!!
June 16, 2014

Calculus
∫1/(x2 − 2x + 8)3/2 dx
June 16, 2014

Chemistry
A student intend to prepare 200ml of 0.3M NaCl solution . The mass in gram of NaCl needed to prepare solution is ?!
April 20, 2014

Chemistry
To remove temporary hardness we may use ?!!!
April 20, 2014

Chemistry
A water sample has TDS of 6000mg/l and the total hardness f 60mg/l , the water can be classified as ........
April 20, 2014

Chemistry
The mass of watch glass is 24.5 g , the mass of watch glass plus white crystals befor drying is 29.1g , and the mass of watch glass and white crystals after drying 27.9 , thus the mass of the white crystals is !????!
April 20, 2014

Chemistry
If we put a drop of acid in a cup of natural water , the PH will ?
April 20, 2014

Chemistry
1.2g of NaCl as used to prepare 200 ml solution , what is the molar concentration of NaCl in solution ?
April 20, 2014

Chemistry
A student mixed 40ml of 0.2m Na2co3 solution with 50 ml f 0.25M cacl2 solution , what is the except number of moles of naclkkw that I will be formed ?
April 20, 2014

Chemistry
The measured experimental volume of ascetic acid in a sample of vinegar was 7% and the manufacture claimed volume is 5.8% , what is the percentage error ?
April 20, 2014

Chemistry
What are the Salts are taken into consideration in the calculation of the total alkalinity ????
April 20, 2014

Chemistry
The separate suspended solid from a solution , we may use .......
April 20, 2014

Chemistry
In TDS experiment , the mass of the empty beaker was 25.683g , and the mass of the beaker after water evaporated 25.687 g , if the volume of the sample 50 ml , then the TDS of the water sample is ?
April 20, 2014

Chemistry
In an experiment we have 4 liters of AlAin water in contain or A , and 2 liters of dubai water in contain out B . The alkalinity of water in container A and the alkalinity of water in container B are 50 and 150mg/l as caco3 ,,respectively the alkalinity of water B is 7
April 20, 2014

Chemistry
In the. Reaction (Na2co3+CaCl2-->2NaCl+caco3) The precipitate is :
April 20, 2014

Physics
Two forces FA and FB are applied to an object whose mass is 9.53 kg. The larger force is FA. When both forces point due east, the object's acceleration has a magnitude of 1.43 m/s2. However, when FA points due east and FB points due west, the acceleration is 1.28 m/s2, due...
April 11, 2014

Uos
Two horizontal forces, and , are acting on a box, but only is shown in the drawing. can point either to the right or to the left. The box moves only along the x axis. There is no friction between the box and the surface. Suppose that = +2.6 N and the mass of the box is 4.7 kg...
April 11, 2014

math
a parabolic bridge over a road is 4 meter tall 4 meter wide and 5 meter long determain the maximum height of a 2 meter truck can drive under the bridge
February 5, 2014

Physics
Problem 3- A 10-g metal ball is moving to the left with a velocity of magnitude 0.4 m/s has a head-on, elastic collision with a larger 30-g metal ball moving to the right with a velocity of magnitude 0.2 m/s. a) Find the speed of the two balls after the collision. b) If the ...
January 12, 2014

Physics
Problem 2- A 15 kg block is attached to a very light horizontal spring of force constant 400 N/m and is resting on a smooth horizontal table as shown in the figure below. Suddenly it is struck by a 3 kg stone traveling horizontally at 8 m/s to the right, whereupon the stone ...
January 12, 2014

Physics
Problem 1- A 0.5 kg ball is moving to the right at 5 m/s when it is suddenly collide by a wall that exerts on it a horizontal force of 2.5 N for a period of 0.8 s. a) What is the impulse does the force of the wall exert on the ball? b) What is the velocity of the ball after ...
January 12, 2014

Physics
A400 N child is swing that is attached tow ropes 2m long , find the gravitational potential energy of the child-earth system relative to the red line level when ropes make an angle with the vertical .
December 4, 2013

Physics
a box initially moving with a speed of 5m/s along a rough , horizontal floor , it stopped it after 5 m the conffenict friction is 0.3 find the work done by friction .
December 4, 2013

Physics
Problem2-AFor A=-I+2j +5k and B=2j-3k,find: a) The dot productA.B b) The angle between the A and B
December 1, 2013

Physics
Problem 4: A 250 g block is dropped onto a relaxed vertical spring that has a spring constant of k= 2.5 N/cm. The block becomes attached to the spring and compresses the spring 12 cm before momentarily stopping. While the spring is being compressed, (a) what work is done on ...
December 1, 2013

Physics
Problem 3- A block of mass m1 = 4 kg moves from rest under the influence of a varying force F(x) = 4x + 38, where F is in newton and x is in meters, on a rough horizontal surface having a coefficient of kinetic friction of 0.2. The block is connected by a light cord passing ...
December 1, 2013

Physics
A roller-coaster car has a mass of 500 k when fully loaded with passengers. If at point a the forces exerted by the truck on the car is 15000 What is the acceleration at point A?
November 30, 2013

Physics
Problem 3- A 40 kg child swings in a swing supported by two ropes, each 3 m long. (a) If the tension in each rope at the lowest point is 350 N, a. find the child's speed at the lowest point. b. the force exerted by the seat on the child at the lowest point. (Neglect the ...
November 23, 2013

Physics
Thank you very much Elena
November 23, 2013

Physics
Problem 2- A 4 kg object is attached to a vertical rod by two strings, as in the Figure. The object rotates in a horizontal circle at constant speed 6 m/s. Find the tension in (a) the upper string and (b) the horizontal string.
November 23, 2013

physics PLEASE HELP ME
a rubber ball is thrown downwards off a balcony. after it travels 55m it has a speed of 46.5m/s. what is the initial velocity
October 10, 2013

physics PLEASE HELP ME
A ball rolling down a hill was displaced at 19.6m while uniformly accelerating from rest. If the final velocity was 5.00 m/s what was the rate of acceptation?
October 10, 2013

Chem
Ores are analyzed by dissolving some of the ore and then performing an analysis of a metal (expressed in grams); usually the concentration of the metal is expressed as % of the amount of the ore (in grams) dissolved. An ore containing V was dissolved and then titrated with ...
April 7, 2013

physics
I have no idea that is why i asked :/
March 20, 2013

physics
A train moves at a speed 72km/hr. When it approaches the station the driver brakes the train stops in 30 minutes. a) what is the value of deceleration? b) what is the duration it takes to stop?
March 20, 2013

chemistry
Calculate the amount of zirconium produced (in kg) if a reactor were charged with 261.0 kg ZrCl4 and 25.0 kg Na .
February 21, 2013

chemisty
What is the density of a 17.12 g object if the dimensions of the block are: length = 12.6 mm height = 9.82 cm width = 0.0140 m
February 20, 2013

chemistry
What is the density of a 28.87 g irregularly shaped object if the initial volume of water was 24.7 ml and the volume rose to 64.1 ml after the object was added?
February 20, 2013

chemisty
volume of water delivered using a buret has a mass of 2.67 g. What was the final volume reading on the buret if the inital volume reading was 0.10 ml? [assume the density of water is 1.00g/mL]
February 20, 2013

chemistry
What is the density of a block of unknown material with a mass of 13.26 g if the dimensions are: length = 2.2 cm height = 1.7 cm width = 4.1 cm
February 20, 2013

science
What is the density of a block of unknown material with a mass of 13.26 g if the dimensions are: length = 2.2 cm height = 1.7 cm width = 4.1 cm
February 20, 2013

algebra
a physical education teacher was getting ready for gym class one day . he measured the circumference of the basketball to be 9 inches when it is filled with air . he then went on to pose the following question to his classes : use 3.14 A ) how much material is needed to make ...
February 18, 2013

physical
A wheel has radius of 0.25 m rotating at 2.08 rad/s. What is the tangential speed of a particle at its edge
January 22, 2013

physics
thnx
November 10, 2012

physics
A=2i+3j-k, b=4i=2j-2k, find the vector x parallel to A but has magnitude of B
November 10, 2012

Physics
A light spiral spring is suspended from its upper end. A mass of 7.5*10^-2, hung from the lower end produces an extension of 0.15 m. The mass is pulled down to a furthur 8.0*10^-2 m and released so that it oscillates calculate the spring constant.
September 17, 2012

Physics
Sir Steve I got the ans 46 but the correct ans is 48 S=vt+1/2at^2 in 1st gear S=v*2+1/2*20*2^2 S=2v+40..........eq 1 in second gear S=vt+1/2at^2 s=v*2+1/2*40*2^2 S=v+80.........eq 2 in third gear S=vt+1/2at^2 S=v*6=1/2*60*6^2 S=6v+1080.......eq 3 substituting eq 3 in eq 2 we ...
September 14, 2012

Physics
Sir but the and which u got is the same as i got but its not given in the options. here are the options A. 12 B. 13.3 C. 40 D. 48 E. 37
September 14, 2012

Physics
14. A racing car accelerates uniformly through three gears, changes with the following average speed: 20 for 2.0 s 40 for 2.0 s 60 for 6.0 s What is the overall average speed of the car?
September 14, 2012

Physics
14. A racing car accelerates uniformly through three gears, changes with the following average speed: 20 for 2.0 s 40 for 2.0 s 60 for 6.0 s What is the overall average speed of the car?
September 14, 2012

college physics
A 2000kg van and a 1500 kg car both travelling at 40ms^-1 in opposite directions collide head on and lock together. what are their speed and direction immediately after the collision?
September 7, 2012

Science
In a tidal barrage scheme, the area of sea-water behind the barrage is 30km^2, tidal depth is 10m and the density of sea water is 1030kgm^-3. a. What energy is possible available from this scheme in one cycle of ebb and flow???
September 7, 2012

college physics
in a pinball machine, a force of 24 N is used to compress a spring a distance of 0.080m. a. What is the potential energy stored in the spring? b. What is the maximum speed tha it van produve in a ball of mass 0.15kg?
September 7, 2012

7th Grade Science
U can imagine a syringe filled with gas..... nw assume that ur appying more pressure on it by increasing the pressure on piston.... as ths is done piston moves down thus compressing the volume of gas n hence we say thay volume decreases as piston moves down
September 6, 2012

physics
Explain how a parachutist's loss of momentum on landing is consistent with the principle of conservation of momentum?
September 5, 2012

college physics
A water-skier is being pulled at a steady speed in a straight line. her mass plus the mass of the ski is 65 kg. the pull of the tow rope on her is 520 N. a...i) What is the vertical component Y of the push of the water on the ski?? ....ii) What is the horizontal component X of...
September 3, 2012

physics
A water-skier is being pulled at a steady speed in a straight line. her mass plus the mass of the ski is 65 kg. the pull of the tow rope on her is 520 N. a...i) What is the vertical component Y of the push of the water on the ski?? ....ii) What is the horizontal component X of...
September 3, 2012

Science
Explain how a parachutist's loss of momentum on landing is consistent with the principle of conservation of momentum?
September 2, 2012

Science
Thnx a lot steve
August 31, 2012

Science
A car starts from rest and moves with constant acceleration during the 5th second of its motion,it covers a distance of 36 meters. what is the acceleration
August 31, 2012

medu
RM 2000 was invested on 15march 2012. If the simple interest rate offered was 10% per annum, find the interest received on 29 August 2012 using A. Exact time and exact simple interest B. Exact time and ordinary simple interest C. Approximate time and exact simple interest D. ...
June 8, 2012

math
okay
April 15, 2012

physics
A hose ejects water at a speed of 2m/s through a hole of area 0.01m2.if the water strikes a wall normally,calculate the force on the wall in Newtons,assuming the velocity of water nomal to wall is zero after collision.
February 16, 2012

poetry
false
January 14, 2012

poetry
true or false iambic pentameter consists of five feet of two syllables,each of which is an uncaacented syllable followed by an accented one
January 14, 2012

science
I NEED HELP WITH MY HOMEWORK COULD YOU HELP ME!!!
April 7, 2011

geometry
reouignerg
March 1, 2011

biology
at the end of meiosis 2 are the chromosomes replicated?
November 22, 2010

Accounting-Journal Entry
Cash DR 97500.00 AC Receivable 552500.00 Sales 650000.00 Sales 650000.00 Cost of Sales 390000.00 Gross profit 260000.00
November 15, 2010

5th grade science/ colloids
ummmmmmmmm......... i acctually havve a question what particales are in a colloid?????? help!!!!!!!
November 9, 2010

math
a parabolic bridge over a road is 4 meter tall 4 meter wide and 5 meter long determain the maximum height of a 2 meter truck can drive under the bridge
November 5, 2010

math
Let f be he real-valued function defined by f(x)=sin^3x+sin^3|x| (a) find f'(x) for x>0 (b) find f'(x) for x<0 (c) determine whether f(x) is continuous and x=0 (d) determine whether the derivative of f(x) exists at x=0
November 4, 2010

2nd Grade
NAME THREE TYPES OF GRAIN GROWN IN PENNSYLVANIA
October 27, 2010

2nd grade
WHAT ARE THREE TYPES OF GRAIN GROWN IN PENNSYLVANIA
October 27, 2010

PRODUCT MAP
WHAT ARE THREE TYPES OF GRAIN GROWN IN PENNSYLVANIA
October 27, 2010

6th grade
what is accleration?
October 2, 2010

U.S. History
what will be the best thesis to start my paper with? my topic is segregation
May 26, 2010

Chemistry
Ethylene glycol, HOCH2CH2OH, is used as antifreeze. It is produced from ethylene oxide, C2H4O, by the following reaction. C2H4O(g) + H2O(l) → HOCH2CH2OH(l) Use Hess's law to obtain the enthalpy change for this reaction from the following enthalpy changes. 2 C2H4O(g...
December 13, 2009

Trigonometry
Yes, it is. It's the same answer I got.
December 10, 2009

biology
What are minerals? Give names of a few minerals and details of the following: 1 Iron and calcium 2 Iodine and phosphorus
November 2, 2009

university
Market demand for wheat is relatively stable over time but market supply of wheat is very much influenced by the weather. For example, a natural drought decreases the supply of wheat and pushes up its prices while a bumper crop can severely depress wheat prices. Acts of nature...
October 30, 2009

math
mj:pj (mango juice : pineapple juice) L=liters 8:56-8 (as 8L of pj taken out and 8L of mj added ) 8:48 = 1:6 (1 part of mj 6 part of pj) when 8L taken out of the new mixture this 8L will contain mj:pj = 8*(1/7):8*(6/7)= 8/7:48/7 so 8L of this taken out from original 8-8/7:48-...
September 27, 2009

calculus
find the domain and range of the function g(x)= 10+2x-x^2 (all under radical)
July 29, 2009

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