Physics: Post your doubts here!

[Zaki ali asghar]

E=f/q 0.50*9.81/1000*1000/1.0^10-12

 

[amina1300]

que 30 anyone ?

E=F/q= mass(kg)*9.81/1x10^-12

 

[Minsa Fatima]

I still dont get this one.. :/ why divide by 2 ?

its mean power and for average we divide by 2

 

[Shimmery woods]

E=F/q= mass(kg)*9.81/1x10^-12

thankyou!

 

[Minsa Fatima]

 

[Holmes]

The wavelength is 0.165m. After 0.165 further away, the same wave pattern will be repeated. Hence D is the appropriate option.

Thanks.

 

[amina1300]

its mean power and for average we divide by 2[/QUOT
For avg we divide it by the number of currents taken. If I take 2 , 1 and -1 (divide by 3 ) wrong answer. It isn't intuitive to take only 2 and -1 ??!!

 

[Holmes]

reason

 

[amina1300]

Thanks.

Holmes which Q is this?

 

[Holmes]

Solve it please with vivid working!

 

[Holmes]

Holmes which Q is this?

 

[amina1300]

reason
View attachment 62525

Is A correct?

 

[Holmes]

Is A correct?

Yes

 

[Holmes]

I think its D

no it is A

 

[Bishnu Dev]

reason
View attachment 62525

Total Resistance in the Loop where V1 is connected = 2 ohm
Total Resistance in the loop where v2 is connected = 1 ohm
Now, V1 > v2

Total current in the circuit will be divided equally in the second loop where I2 is labelled so I2 is half the current in the circuit. But I1 must be greater than the current in 6 ohm resistor. 2 (I2) = I1 + Current in 6 ohm resistor. Current in 6 ohm resistor must be less than I2.
Hence I1 > I2

 

[amina1300]

reason
View attachment 62525

You got me confused by the other answer
For A
Take combined resitance in both loops .
Right loop; Left loop;
1 ohm 2 ohm

V1 + V2 = emf
hence p.d V1 > V2
B and D are incorrect.

Right loop;
Both branches have equal resistances.
Right loop;
more current in 3 ohm resistor than 6 ohm (V=IR)

This gives I1 >I2

 

[A.Joshua]

Can anyone solve this...
6 A single sheet of aluminium foil is folded twice to produce a stack of four sheets. The total
thickness of the stack of sheets is measured to be (0.80 ± 0.02) mm. This measurement is made
using a digital caliper with a zero error of (−0.20 ± 0.02) mm.
What is the percentage uncertainty in the calculated thickness of a single sheet?
A 1.0% B 2.0% C 4.0% D 6.7%

 

[Bishnu Dev]

Solve it please with vivid working!

R is directly proportional to the Length. So 4 times length = 4 times resistance
R is inversely proportional to the diameter square. Diameter is half so resistance is quadrupled. (4 * Resistance)
Combining both = 4 * 4 * R = 192 ohm..... I don't know if it is right

 

[Your 69Mom]

What is the order of magnitude of the Young modulus for a metal such as copper?
A: 10^–11 Pa B: 10^–4 Pa C: 10^4 Pa D: 10^11 Pa
9702_w16_qp_11 Q.1
How do we even answer such questions?

 

[Bishnu Dev]

Can anyone solve this...
6 A single sheet of aluminium foil is folded twice to produce a stack of four sheets. The total
thickness of the stack of sheets is measured to be (0.80 ± 0.02) mm. This measurement is made
using a digital caliper with a zero error of (−0.20 ± 0.02) mm.
What is the percentage uncertainty in the calculated thickness of a single sheet?
A 1.0% B 2.0% C 4.0% D 6.7%

Answer is 4%?