Biology; Chemistry; Physics: Post your doubts here!

[Fate0]

road tyres

i actually wrote fixing tyre over an axle as an advantage

Hey plz tell me which hydroxides and oxides (bases ) are soluble?

All hydroxide and oxides are insoluble except group 1 and Ammonium.

 

[Muhammad_Hamza]

One answer was Bridge rollers??? is it correct?

road tyres

 

[Laibaaa]

Noooo mass was 0.06 kg!

Mass was 0.50kg.
The next answer was 113400J.

 

[Lilly2318]

Mass was 0.50kg.
The next answer was 113400J.

i got 0.26 which is wrong will i get e.c.f

 

[Abdul Hanan]

advantage: opening metal lids of bottles (i saw this in past paper)
disadvantagerailway tracks)
is it okay?

 

[Fate0]

One answer was Bridge rollers??? is it correct?

Bridge rollers is a way to correct the problem by expansion so I'd say no.

 

[Lilly2318]

i actually wrote fixing tyre over an axle as an advantage


All hydroxide and oxides are insoluble except group 1 and Ammonium.

so is my tyres ans wrong?
in advantage i wrote railway lines

 

[Riding hood]

Mass was 0.50kg.
The next answer was 113400J.

Whatt!! It cant bee :/ ;(
How did u calculate it? Temperature change was 34*C (94-60)

 

[Lilly2318]

advantage: opening metal lids of bottles (i saw this in past paper)
disadvantagerailway tracks)
is it okay?

i wrote railway tracks advantage cuz it fills up gaps,gaps are left intentionally

 

[Muhammad_Hamza]

Bridge rollers is a way to correct the problem by expansion so I'd say no.

 

[DaniyalK]

Mass was 0.50kg.
The next answer was 113400J.

Second was 114307J. 4200 * 0.504 * 54

 

[Laibaaa]

I wrote expansion and damage to car dashboards (as a disadvantage of expansion)

 

[Fate0]

Whatt!! It cant bee :/ ;(
How did u calculate it? Temperature change was 34*C (94-60)

9000 x 8
-------------------
4200 x (94-60)

 

[Abdul Hanan]

i wrote railway tracks advantage cuz it fills up gaps,gaps are left intentionally

railway tracks bend due to expansion and are reason of most railway accidents

 

[Fate0]

Second was 114307J. 4200 * 0.504 * 54

It depends. I rounded off the value of mass to two sign figures and took it as 0.5
0.5 say 113 400 ata hai. Sahi hai donon

 

[Lilly2318]

railway tracks bend due to expansion and are reason of most railway accients

ok. so is the tyres ine right? in disadvantage

 

[Laibaaa]

i wrote railway tracks advantage cuz it fills up gaps,gaps are left intentionally

I did that too. To fill the gaps left. Lets hope thats correct.

 

[Riding hood]

9000 x 8
-------------------
4200 x (94-60)

Omg! Time bhi tha!

 

[FLRNAB]

x meter to nae tha
more than 1, less than 1 tha

Wohi. I couldn't remember the lengths.
Care to answer anyone?

 

[DaniyalK]

It depends. I rounded off the value of mass to two sign figures and took it as 0.5
0.5 say 113 400 ata hai. Sahi hai donon

oh, ok. I didn't know the extra .004 could make a difference of almost 1000J