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Mariam
Questions (144)
To remove temporary hardness we may use ?!!!
2 answers
447 views
A water sample has TDS of 6000mg/l and the total hardness f 60mg/l , the water can be classified as ........
1 answer
566 views
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
2 answers
965 views
If we put a drop of acid in a cup of natural water , the PH will ?
1 answer
399 views
1.2g of NaCl as used to prepare 200 ml solution , what is the molar concentration of NaCl in solution ?
3 answers
571 views
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
1 answer
519 views
The measured experimental volume of ascetic acid in a sample of vinegar was 7% and the manufacture claimed volume is 5.8% , what
3 answers
471 views
What are the Salts are taken into consideration in the calculation of the total alkalinity ????
1 answer
367 views
The separate suspended solid from a solution , we may use .......
1 answer
359 views
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
1 answer
556 views
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
1 answer
602 views
In the. Reaction (Na2co3+CaCl2-->2NaCl+caco3)
The precipitate is :
1 answer
856 views
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,
1 answer
757 views
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
0 answers
891 views
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
1 answer
595 views
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
1 answer
6,381 views
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
1 answer
609 views
A400 N child is swing that is attached tow ropes 2m long , find the gravitational potential energy of the child-earth system
0 answers
722 views
a box initially moving with a speed of 5m/s along a rough , horizontal floor , it stopped it after 5 m the conffenict friction
0 answers
366 views
Problem2-AFor A=-I+2j +5k and B=2j-3k,find:
a) The dot productA.B b) The angle between the A and B
0 answers
302 views
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
1 answer
2,258 views
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
0 answers
505 views
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
1 answer
769 views
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
3 answers
1,792 views
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
4 answers
2,858 views
Ores are analyzed by dissolving some of the ore and then performing an analysis of a metal (expressed in grams); usually the
0 answers
561 views
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
2 answers
449 views
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 answers
606 views
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
5 answers
2,666 views
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
2 answers
442 views
A 2000kg van and a 1500 kg car both travelling at 40ms^-1 in opposite directions collide head on and lock together. what are
0 answers
923 views
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
0 answers
922 views
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
1 answer
1,137 views
Explain how a parachutist's loss of momentum on landing is consistent with the principle of conservation of momentum?
0 answers
496 views
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
1 answer
666 views
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
1 answer
1,029 views
Explain how a parachutist's loss of momentum on landing is consistent with the principle of conservation of momentum?
0 answers
457 views
A car starts from rest and moves with constant acceleration during the 5th second of its motion,it covers a distance of 36
5 answers
7,278 views
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
0 answers
894 views
what will be the best thesis to start my paper with? my topic is segregation
1 answer
372 views
Ethylene glycol, HOCH2CH2OH, is used as antifreeze. It is produced from ethylene oxide, C2H4O, by the following reaction.
C2H4O(g
0 answers
710 views
What are minerals? Give names of a few minerals and details of the following:
1 Iron and calcium 2 Iodine and phosphorus
0 answers
432 views
Market demand for wheat is relatively stable over time but market supply of wheat is very much influenced by the weather. For
3 answers
579 views
find the domain and range of the function g(x)= 10+2x-x^2 (all under radical)
1 answer
415 views
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