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Physics: Post your doubts here!

J

Jinosupreme

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Dashexdan said:
Q9 anyone btw ans D.
Click to expand...

speed 33 m s^–1
density of the air is 1.2 kg m^–3.
The wall has an area of 12 m^2
What is the force?
First u relate with ur data givien,
So to relate
Density = mass/volume
How u get volume from data?
The only way is to to relate speed and area.
Speed multiply with area
33 X 12 = 396m^3 s^-1

Relate density with this data
1.2 kg m^-3 X 396m^3 s^-1 = 475.2 kg s^-1
Now how to relate to force?
F=ma
F=m(v-u)/t

Since u found m/t = 475.2
Sub ur values
Force = 475.2 (33 - 0)
Force = 15681
= 16000N
 
J

Jinosupreme

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P1_zps72f867db.png

Answer is C. Always see this question, but never really understands it.


P2_zps4a48b2a9.png


Anyone explain? Answer B
 
J

Jinosupreme

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Can anyone explain

P5_zpsa7f60e5e.png

Answer is 2 and 3. Why?

And

P6_zps7854e27c.png

Answer is D. Is it because it is impossible to be 0A current when there is max PD?
 
periyasamy

periyasamy

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Hai guys,anyone can explain why is z compression?I think i know why point x n y is tension as it is against weight.
 

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periyasamy

periyasamy

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Jinosupreme said:
speed 33 m s^–1
density of the air is 1.2 kg m^–3.
The wall has an area of 12 m^2
What is the force?
First u relate with ur data givien,
So to relate
Density = mass/volume
How u get volume from data?
The only way is to to relate speed and area.
Speed multiply with area
33 X 12 = 396m^3 s^-1

Relate density with this data
1.2 kg m^-3 X 396m^3 s^-1 = 475.2 kg s^-1
Now how to relate to force?
F=ma
F=m(v-u)/t

Since u found m/t = 475.2
Sub ur values
Force = 475.2 (33 - 0)
Force = 15681
= 16000N
Click to expand...
Good job buddy.Nice explanation.Exeptional........
 
periyasamy

periyasamy

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Jinosupreme said:
P1_zps72f867db.png

Answer is C. Always see this question, but never really understands it.


P2_zps4a48b2a9.png


Anyone explain? Answer B
Click to expand...
Boss ,1st question option a and d cannot as the emf never changes in whatever situation.It is the p.d that differs.How can it be work overcome against resistor??.It must be internal resistance because it is not the overall voltage that is significant here but it is the p.d across dry cell(overcome internal resistance..

For the 2nd question current increases as current will have an option to flow between the two junctions shown.Instead of flowing through resistor,it would follow the bottom path tthat is without any resistor.So lesser resistance,higher current.
The voltage decreases to zero because no current will flow to the upper part of junction.
Sorry man,if i confuse u .I hope it helps.
 
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