Biology; Chemistry; Physics: Post your doubts here!

[ashiqbal]

How to convert Km/h to m/h ?
How to convert N/kg to N/g ?

its metres per second not metres per hour
easy:
numerator--->km to m = multiply by thousand.
denominator--->hours to second = multiply by 3600
overall = multiply by 1000/3600

denominator---> kg to g = multiply by 1000
overall ---> multiply by 1/1000

 

[Raikko]

its metres per second not metres per hour
easy:
numerator--->km to m = multiply by thousand.
denominator--->hours to second = multiply by 3600
overall = multiply by 1000/3600

denominator---> kg to g = multiply by 1000
overall ---> multiply by 1/1000

thanks!

can u answer this 2 questions ....show workings......plx.....
5- A motor car is uniformly decelerates from 90km/h to 18km/h in a time of 10sec. What is its acceleration?
6- Calculate the weight of an object having a mass of 250g.Take gravity g=10N/kg?

 

[Raikko]

Assalam-o-Allaikum and Hi everyone ,
hope u all are doin great !

Well as the topic says help for chemistry biology and Physics is available here that means that u can ask any mind blowing question or ask any question regarding a particular topic or ask abt any questions from Past paper or any of your text books.

I made this topic so that people dont make many posts asking abt bio,physics or chemistry individually but they can post their reply here where it can be answered with ease and the members wont have to go searching for topics to help! !

So what are u waiting for now write ur questions here !
THANKS and Bye or Allah Hafiz ! :wink: :good:

can someone answer this 2 questions ....show workings......plx.....
5- A motor car is uniformly decelerates from 90km/h to 18km/h in a time of 10sec. What is its acceleration?
6- Calculate the weight of an object having a mass of 250g.Take gravity g=10N/kg?

 

[Raikko]

Assalam-o-Allaikum and Hi everyone ,
hope u all are doin great !

Well as the topic says help for chemistry biology and Physics is available here that means that u can ask any mind blowing question or ask any question regarding a particular topic or ask abt any questions from Past paper or any of your text books.

I made this topic so that people dont make many posts asking abt bio,physics or chemistry individually but they can post their reply here where it can be answered with ease and the members wont have to go searching for topics to help! !

So what are u waiting for now write ur questions here !
THANKS and Bye or Allah Hafiz ! :wink: :good:

can some one answer this question?
which of the following depends only on the amount of matter in a body?
A.Density B.Mass C.Volume D.Weight

 

[SilverCrest]

Can anyone post guess papers for bio ,chem and physics..???please!!!really need them!

 

[xcherriesx]

I think this question has been asked many times before but here goes.
should we only learn the Learning Outcomes given in syllabus ? forexaple in Physics syllabis it says students should be able to state newtons 3rd law. so no need to learn the first and second laws?
thanks

please answer this question anyone!!

 

[SilverCrest]

can someone answer this 2 questions ....show workings......plx.....
5- A motor car is uniformly decelerates from 90km/h to 18km/h in a time of 10sec. What is its acceleration?
6- Calculate the weight of an object having a mass of 250g.Take gravity g=10N/kg?

6- first convert grams to kilograms
250/1000
=.25kg
Weight=m x g so
weight=.25 x 10
25N

5-
convert speed in m/s
90km/h=25m/s
18km/h=5m/s
acc=change in velocity/time

acc=25-5/10
=2m/s^2

 

[ashiqbal]

6- first convert grams to kilograms
250/1000
=.25kg
Weight=m x g so
weight=.25 x 10
25N

5-
convert speed in m/s
90km/h=25m/s
18km/h=5m/s
acc=change in velocity/time

acc=25-5/10
=2m/s^2

but souldnt we FIND ANSWER of acc. in kilometres per hour^2?

 

[Raikko]

please answer this question anyone!!

No many times it used to come newtons 1st and 2nd law...i think its better to Learn......

 

[Raikko]

6- first convert grams to kilograms
250/1000
=.25kg
Weight=m x g so
weight=.25 x 10
25N

5-
convert speed in m/s
90km/h=25m/s
18km/h=5m/s
acc=change in velocity/time

acc=25-5/10
=2m/s^2

Thanks u so much

 

[ashiqbal]

xcherriesx said: ↑

I think this question has been asked many times before but here goes.
should we only learn the Learning Outcomes given in syllabus ? forexaple in Physics syllabis it says students should be able to state newtons 3rd law. so no need to learn the first and second laws?
thanks​

newtons first law and second law will never come by definition,
you just have to know fact of first law that for an object to be in equilibrium, there is no resultant force acting on it and for second law, you must know that F=ma

 

[Raikko]

but souldnt we FIND ANSWER of acc. in kilometres per hour^2?

can u tell me ...how u converted km/h to m/s ? exactly i dont know dude....im kinda new to physics...

 

[Raikko]

6- first convert grams to kilograms
250/1000
=.25kg
Weight=m x g so
weight=.25 x 10
25N

5-
convert speed in m/s
90km/h=25m/s
18km/h=5m/s
acc=change in velocity/time

acc=25-5/10
=2m/s^2

thanks

can u tell me ...how u converted km/h to m/s ? exactly i dont know dude....im kinda new to physics...

 

[ashiqbal]

can u tell me ...how u converted km/h to m/s ? exactly i dont know dude....im kinda new to physics...

multiply by (1000/3600)

 

[Raikko]

Can anyone post guess papers for bio ,chem and physics..???please!!!really need them!

guess pastpapers or exact past papers...... just click this link sis...
http://www.xtremepapers.com/papers/

u got it?sis?

 

[Raikko]

multiply by (1000/3600)

WOW THANKS DUDE


now can u tell me how to convert N/kg to N/g ?

 

[luckywang]

WOW THANKS DUDE


now can u tell me how to convert N/kg to N/g ?

already answered?
denominator---> kg to g = multiply by 1000
overall ---> multiply by 1/1000

 

[Dukeofwin]

40 Two heterozygotes are crossed. Some of the offspring show the recessive characteristic.

What is the probability that one of these offspring that shows the recessive characteristic is
homozygous?
A 0.00 B 0.25 C 0.50 D 1.00

Please anwer this with expalnation

 

[ashiqbal]

40 Two heterozygotes are crossed. Some of the offspring show the recessive characteristic.

What is the probability that one of these offspring that shows the recessive characteristic is
homozygous?
A 0.00 B 0.25 C 0.50 D 1.00

Please anwer this with expalnation

C 0.50
draw genetic diagram
Aa * Aa
A---a__*__A---a
AA---Aa---Aa---aa
AA and aa are homozygous.
prabability = 2/4 =0.5

 

[Dukeofwin]

C 0.50
draw genetic diagram
Aa * Aa
A---a__*__A---a
AA---Aa---Aa---aa
AA and aa are homozygous.
prabability = 2/4 =0.5

Firstly it asks for recessive so it should be 0.25(becuase its 1 in 4)
However the correct answer from Marking scheme is D)1