Physics, Chemistry and Biology: Post your doubts here!

[xlnc123]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w13_qp_61.pdf
question 3 part f- 3

 

[Stephanie Hyacinth]

but how is 61.9 double of 0.29

It is probably 29.0cm and she may have measured it wrong cause the printing scale of the printer could have been wrong

 

[Awesome12]

Howzzit dunn?

The answer is D
A greater force is being exerted on the left side of the block. This will cause it to move to the right. Since the forces acting on the body are not equal, it cannot move with constant speed and that leaves us with constant acceleration

To create cathode rays in a vacuum, what might be a suitable p.d to connect bw the cathode and anode? It'll be a.c or d.c?

You can use both, but that does not create a vacuum. A vacuum is created by actually sucking all the air from the CRO

 

[xlnc123]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w13_qp_61.pdf
question 3 part f- 3

please explain the working

 

[xlnc123]

c

please explain the working

chem doubt paper 6 2013 practical

 

[qazmed]

It is probably 29.0cm and she may have measured it wrong cause the printing scale of the printer could have been wrong

thanks alot for ur help but one last qs?
in a histogram do i have to start the x-axis from zero?
and
i use frequency in biology histograms not frequency density right?

 

[saif mahmoud]

It is probably 29.0cm and she may have measured it wrong cause the printing scale of the printer could have been wrong

thanks alot

 

[Stephanie Hyacinth]

thanks alot for ur help but one last qs?
in a histogram do i have to start the x-axis from zero?
and
i use frequency in biology histograms not frequency density right?

welcome, no you don't, you start it from the first values on the table and you use frequency yes because all your columns need to be of equal width

 

[Awesome12]

Please open this in Paint and edit it. thankx

 

[shoaib672002]

View attachment 41007

AWESOME!

 

[Ameena Eesa]

The answer is D
A greater force is being exerted on the left side of the block. This will cause it to move to the right. Since the forces acting on the body are not equal, it cannot move with constant speed and that leaves us with constant acceleration


You can use both, but that does not create a vacuum. A vacuum is created by actually sucking all the air from the CRO

so what p.d shall i apply? 6Va.c /600V a.c /6000a.c/6Vd.c /600V d.c /6000d.c ??? It's an MCQ

 

[Ameena Eesa]

The answer is D
A greater force is being exerted on the left side of the block. This will cause it to move to the right. Since the forces acting on the body are not equal, it cannot move with constant speed and that leaves us with constant acceleration


You can use both, but that does not create a vacuum. A vacuum is created by actually sucking all the air from the CRO

so what p.d shall i apply? 6Va.c /600V a.c /6000a.c/6Vd.c /600V d.c /6000d.c ??? It's an MCQ

 

[Mai(M4!)]

Mai(M4!)
okay i will tell u the ans but not 100% sure

see, when humans consume green plants as there food they are acting as primary consumer while
when animals are fed on the crop plants then we consume the animals then we are secondary consumer
so it is more efficient to be at primary consumer level as we will have more energy gained due to less number of trophic levels and when animals consume the plants first they lose alot of energy in respiration, movement and excretion even fighting diseases so eating plants directly gives more energy so more efficient due to less energy loss by animals because as the trophic level increases the energy available decreases .

Hope this was the right answer

Thanks that was helpful

 

[Muhammad_Hamza]

View attachment 41007

Thanks..

 

[Mavilda Bucket]

label the ligament, shell, muscle attachment, exoskeleton, hinge , joint

 

[DDanielAWE@]

Guys can you please help me
Question 1
SOurce: http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_31.pdf
Fast

 

[princess sofia]

Guys can you please help me
Question 1
SOurce: http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_31.pdf
Fast

make a scale diagram using the scale given , make it a parallelogram
the diagonal is shown by dotted line , extend it to meet the other edge , measure it and multiply by the scale to get the resultant force

 

[princess sofia]

can someone plz check my thx ans is thx rite n if nt so wt shd i write

 

[saif mahmoud]

can someone plz check my thx ans is thx rite n if nt so wt shd i write View attachment 41054

its ok add a point to place glue around the tip of tube to make sure nothing enters byt its ok (Y)

 

[Mavilda Bucket]

Label
: from
rachis / calamus / after feathers / vane / shaft / quill /
umbilicus / barb;


where to label these?