# Posts by cylinder

Total # Posts: 95

You said: "tap water" but more likely, what are the units for the accepted and the measured? I said: I dont know it doesnt say but those are the 2 values for a single silver atom if that helps you figure out the units. you said: No, I know the units, the point is you...

Silver plating: A student attempts the process of silver plating to determine the mass of a silver atom. a series of objects are measured, then electroplated for a measure period of time, while maintaining a steady current through a solution of silver nitrate in tap water. ...
3. ### physics as

no its 10-7 as in it equals to 3 AND you minus it, its not a power. Please post hrelp with this in mind
4. ### physics as

the figure below shows the graph of force,F (y axis)acting on a trolley of 0.4kg against time,t (x axis) 20--------- ........._-- ........._...-- ........._....--- ........._......--- ........._.......----- 0........5............9 The velocity of the trolley is constant ...
5. ### As physics

Thank you so much both of you really helpful!! :)
6. ### As physics

Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge Calculate the number of free electrons per metre length of ...
7. ### As physics

i figured out that f x change in t =change in p is the equations used and nowi understand that bit so it became: change in momentum= 20 x 5=100 change in momentum= 1/2(20x4)=40 i just dont get the 10-3 bit
8. ### As physics

The "10-3" bit especially confuses me as i dont know where those number came from and wat it is for/ wat equation
9. ### As physics

the figure below shows the graph of force,F (y axis)acting on a trolley of 0.4kg against time,t (x axis) 20--------- ........._-- ........._...-- ........._....--- ........._......--- ........._.......----- 0........5............9 The velocity of the trolley is constant ...
10. ### Physics

and one of the options is right so do that working out to find out which one
11. ### Physics

54(9.8*sin15+1.2) will show you the option it is
12. ### Physics

Choose from the options below:( to get you thinking) A 202 N B 222 N C 242 N D 262 N
13. ### As physics

So is all this what i should right? i dunt know which bit is relevant as so much stuff comes up and i dont know what to link and what is required of me to write, now that i have given it a go could you please help

15. ### As physics

Lead pipes. For many centuries, water pipes were made of lead, because of its ease of processing and durability. ... Most of the lead pipes that exist today are being removed and replaced with the more common material, copper or some type of plastic.
16. ### As physics

nothing comes up useful when i write:why is the mass of a silver atom higher than expected and im not sure what to write please help me more
17. ### As physics

1) Tap water is water supplied to a tap. Its uses include drinking, washing, cooking, and the flushing of toilets. 2) Today, most plumbing supply pipe is made out of steel, copper, and plastic; most waste (also known as "soil") out of steel, copper, plastic, and cast...
18. ### As physics

I dont know it doesnt say but those are the 2 values for a single silver atom if that helps you figure out the units.
19. ### As physics

Silver plating: A student attempts the process of silver plating to determine the mass of a silver atom. a series of objects are measured, then electroplated for a measure period of time, while maintaining a steady current through a solution of silver nitrate in tap water. ...
20. ### math

Given, Diameter = 21m, cost of the rope = Rs 4 per meter, length of the rope required to fence the garden two round=?, Cost of the rope = ? The length of rope required = 2 × circumference. Circumference = 2 ? r = ? D = (22/7) × 21 = 66 m Therefore, length of rope ...
21. ### As Physics

in which wire will the electrons move faster and why?
22. ### As Physics

Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge Two copper wires of diameter 1 mm and 2 mm are joined end to...

24. ### As Physics

i cant find the numbers for the equation yo gave me "NUMBER electrons per lenth=electron dinsity)*area"
25. ### As Physics

is there a way to work this out?
26. ### As Physics

Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge Calculate the number of free electrons per metre length of ...
27. ### chemistry

Iodide and diamond crystals both contain covalent bonds and yet the physical properties of their crystals are very different. Their melting points are 387K and 3827K respectively. State this type of structure present in each case and explain why the melting point of diamond is...
28. ### chemistry

Carbon tetrachloride, CCl4 is used as a solvent and a coolant. Its boiling point I s-22.9 degrees. By considering the intermolecular forces involved discuss whether you expect the boiling point of CHCL3 to be greater or lower than tis value. [6] Please help
29. ### Science

dGorxn = (n*dGo products) - (n*dGo reactants
30. ### physics As

Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge A piece of fuse wire has a diameter of 0.22mm and carries a ...
31. ### physics As

The current carriers in a piece of semiconducting material have a charge of 1.6 x 10^-19C. Calculate the number of charge carriers entering the material per second when the current is 3 microamps so 3 x 10^-6 amps. ? Please help and do it step by step all parts of questions ...
32. ### trigonometry

? = s/r = (6 m)/(5/2 m) = 12/5 radians = 2.4 radians r = s/? = (60 ft)/(3?/2) = 40/? ft ? 12.732 ft
33. ### As physics

Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge Two copper wires of diameter 1 mm and 2 mm are joined end to...
34. ### As physics

Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge Calculate the number of free electrons per metre length of ...
35. ### As physics

Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge A piece of fuse wire has a diameter of 0.22mm and carries a ...

37. ### As physics

The current carriers in a piece of semiconducting material have a charge of 1.6 x 10^-19C. Calculate the number of charge carriers entering the material per second when the current is 3 microamps so 3 x 10^-6 amps. ? Please help and do it step by step all parts of questions ...
38. ### Science

How old the object containing the element is.
39. ### As physics

change in mass___total charge_____no of elect for each of______delivered by_______rons pass objects_________circuit(eachtest)_(thrcathod) _____________________________________________0.14____________144__________9 x 10^20___ 0.57_____________132__________8.25 x 10^20_ 0....
40. ### Damon/BobPursley/Physicstutor/whichoneisright

This is the clearest explanation given for this thread thank you. But may I ask what equation you used at the beginning as I can’t seem to find it when I searched it online but at first I thought it was d=vt but b=velocity isn’t squared in this equation. Also, what ...
41. ### Damon/BobPursley/Physicstutor/whichoneisright

Q11.The table below shows how the braking distance x for a car depends on its initial speed u. | u / ms-1 | 5 | 10 | 20 | 40 | | X / M | 2 | 8 | 32 | 128 | The relationship between x and u is: doubling speed increases distance by a factor of 4. i)The reaction time of a driver ...
42. ### physics

Please just tell me if I AM right or wrong because the website wont do that. I think I: -add percentage uncertainty of stress and strain together (i think this is the total percentage uncertainty so the young modlus unceratinty??) -then i use this percentage to find no% of ...
43. ### physics

To calculate the young modulus uncertainty do you add together the percentage uncertainty of strain and stress and if not then what do u do. Please dont send websites just tell and help me out.

45. ### Physics

i also dont get how to work out damons last line if his is right
46. ### Physics

Damon said: v = Vi + a t where t is AFTER 0.6 s v = 30 + a t so x = Xi + Vi t + (1/2) a t^2 a will be negative of course Xi is 18 when t = 0 x = 18 + 30 t + (1/2) a t^2 -i dont know what xi means -if this wiill result in yuor answer or the mark scheme answer but just sent it ...
47. ### Physics

Please tell me what you think of the mark scheme answer what they did and if now looking at this mark schee answer you stillthink that it is wrong and your answer is right? just as i want to make sure my notes are right.
48. ### Physics

Thank you, finally someone who answered, I have been waiting ages for this questions answer. So you saying that your 100 percent sure that is the answer and the mark scheme which the examiner made is wrong?? This is what the mark scheme said for braking distance: BRAKING ...
49. ### Physics

Q11.The table below shows how the braking distance x for a car depends on its initial speed u. | u / ms-1 | 5 | 10 | 20 | 40 | | X / M | 2 | 8 | 32 | 128 | The relationship between x and u is: doubling speed increases distance by a factor of 4. i)The reaction time of a driver ...

not 0

60
52. ### math/science

the cars acceleration is zero
53. ### Damon As physics

I reposted like you asked and i included the full question and my working out and what i need help with so pplease help
54. ### As physics

Q11.The table below shows how the braking distance x for a car depends on its initial speed u. | u / ms-1 | 5 | 10 | 20 | 40 | | X / M | 2 | 8 | 32 | 128 | The relationship between x and u is: doubling speed increases distance by a factor of 4. i)The reaction time of a driver ...
55. ### physics As

by the wa for the table 5 is above 2 10 is above 8 andso on the space i leftr arent posted/shown
56. ### physics As

Q11.The table below shows how the braking distance x for a car depends on its initial speed u. | u / ms-1 | 5 | 10 | 20 | 40 | | X / M | 2 | 8 | 32 | 128 | The relationship between x and u is: doubling speed increases distance by a factor of 4. i)The reaction time of a driver ...

58. ### physics As

What i think s dunno u 30 v dunno a 9.81 t dunno someone used the equation v=u+at and s=ut+1/2at^2 if t is zero then i think v is 30 after putting the numbers in. then.. oim confused using suvat and where the numbers came from please help
59. ### physics As

The table below shows how the braking distance x for a car depends on its initial speed u u / ms-1 5.0 10 20 4 x / m 2.0 8.0 32 128 the reaction time of a driver is 0.60s. Calculate the sopping distance of the car when u= 30ms-1. The mark scheme says: Thinking distance= 30 X 0...
60. ### As physics

There is a right angle triangle: -.- -...- -......- -.........- T (wire) -............- -...............- ------------------ 30 degrees ....--.....--.....rod...
61. ### physics

do the same positive power 2 on both sides cancel out or the opposite - and + powers
62. ### physics

do these cancel out and why/why not? S^2 = S^2 S^-2 = S^2
63. ### As physics

I know 1 is in equilibrium. 2 is not. 3 I'm not too sure about.
64. ### As physics

A 2.0 rigid rod with negligible weight is subject to forces in three different ways as shown in diagrams 1-3 below. diagrams: 1- middle point: 2.0 N distance on both sides: 1.0 m apart forces below at the end of each side: 1.0 N 2- distance on both sides: 1.0 m apart force ...
65. ### As physics

I'm am very stuck on this one so I dont have working out and need all steps.
66. ### As physics

(As physics working out please) (SI UNITS) Which physical quantity has the same base units as energy? SHOW ALL WORKING OUT! A:Moment B:Momentum C:force D:pressure
67. ### As physics

I think magnitude means how much of something or how long the sides are or the angle.
68. ### As physics

What does decreased in MAGNITUDE mean?
69. ### As physics

...........---y---- .........----------- ......------------------- ...-------------------------- . x----------------------------z is the picture
70. ### As physics

and equal on both side
71. ### As physics

It looks kinda like the last image i posted but its a curve
72. ### As physics

...........---y---- .........----------- ......------------------- ...-------------------------- . x----------------------------z
73. ### As physics

Y -- - -- --- - - ----- -- - -------------- - - ----------------- - X Z
74. ### As physics

Y - - - - - - - - - - X Z
75. ### As physics

Here I've already written what I thought of the question in caps lock and the thing I dont know at the bottom.
76. ### As physics

Describe how the vertical component of the velocity of the water varies form point X to point Z? Image with a flat horizontal line with a curve on top (beg curve: X, top middle curve: Y, End bottom curve: Z) Mark scheme Answer: decreases from x to y DON’T GET I thought it...
77. ### As physics

I think this is because of no movement...??
78. ### As physics

How is kinetic energy lost on impact to the ground?
79. ### As physics

I am in as and we dont use those symbols so im confused
80. ### As physics

I wrote what I do know and the caps lock is what I dont know, and that is the working out for braking distance shown above is confusing to me.
81. ### As physics

The table below shows how the braking distance x for a car depends on its initial speed u u / ms-1 5.0 10 20 4 x / m 2.0 8.0 32 128 the reaction time of a driver is 0.60s. Calculate the sopping distance of the car when u= 30ms-1. The mark scheme says: Thinking distance= 30 X 0...
82. ### As physics

The drag force acting on a car travelling at a speed v is given by the equation F=kAv^2 Where A is the area of the front of the car. Show that a suitable unit for the quantity k is kgm-3. Mark scheme answer: F= kgms-2 or A=m2 V=ms-1 Which is K=kgm-3 I am confused could someone...
83. ### As physics

In a hockey match a hockey ball is hit 18m from the front of the goal. The ball leaves the hockey stick with initial velocity v at angle theta to the horizontal ground. The ball passes over the goal at a maximum height of 2.0m. The initial vertical component of the velocity of...

85. ### As physics

In a hockey match a hockey ball is hit 18m from the front of the goal. The ball leaves the hockey stick with initial velocity v at angle theta to the horizontal ground. The ball passes over the goal at a maximum height of 2.0m. The initial vertical component of the velocity of...
86. ### As physics

The drag force acting on a car travelling at a speed v is given by the equation F=kAv^2 Where A is the area of the front of the car. Show that a suitable unit for the quantity k is kgm-3. Mark scheme answer: F= kgms-2 or A=m2 V=ms-1 Which is K=kgm-3 I am confused could someone...
87. ### As physics

The table below shows how the braking distance x for a car depends on its initial speed u u / ms-1 5.0 10 20 4 x / m 2.0 8.0 32 128 the reaction time of a driver is 0.60s. Calculate the sopping distance of the car when u= 30ms-1. The mark scheme says: Thinking distance= 30 X 0...
88. ### As physics

How is kinetic energy lost on impact to the ground?
89. ### As physics

So would collision is ELASTIC mean: the two objects don't stick together and move with different velocities? ?????
90. ### As physics

What does collision is INELASTIC mean?
91. ### As physics

Image with a flat horizontal line with a curve on top (beg curve: X, top middle curve: Y, End bottom curve: Z) Describe how the vertical component of the velocity of the water varies form point X to point Z? Mark scheme Answer: decreases from x to y DON’T GET I thought it...
92. ### As physics

What does decreased in MAGNITUDE mean?
93. ### As physics

(As physics working out please) Which physical quantity has the same base units as energy? SHOW ALL WORKING OUT! A:Moment B:Momentum C:force D:pressure
94. ### physics

A 2.0 rigid rod with negligible weight is subject to forces in three different ways as shown in diagrams 1-3 below. diagrams: 1- middle point: 2.0 N distance on both sides: 1.0 m apart forces below at the end of each side: 1.0 N 2- distance on both sides: 1.0 m apart force ...
95. ### physics

an ostrich can run a maximum speed of 70km per hour. You have to convert the 70km to 70000m. you have to convert the per hour part too and 1hr =60 min. Somehow the time becomes 3600, could someone please tell me how?