Physics: Post your doubts here!

[BhaiArshad]

How can we estimate volume of an adult head?
any tip for the estimations please?

take 15 cm scale.
measure your head dimensions.
fFind volume
Profit..???

 

[DaniyalK]

help...ans is B ..View attachment 54924

1 = sqrt[(1+cosx)^2 + (sinx)^2]
x = 120

 

[Ahmed Aqdam]

How can we estimate volume of an adult head?
any tip for the estimations please?

Use this file.
You can also estimate by (4pi/3)*r^3. Use r as 7-9 cm.

 

[BhaiArshad]

ans is c help

Tension in XY = 4N
Tension in XZ = 4N

Extend the line of P so that it crosses through the troangle. It forms 2 right andle triangles. ANgle between Perpendicular and Hypotenuse(XY,XZ) can be found by Sin Theta = 40/50
angle is 53.1

Force of XY in direction P = 4 cos (53.1) = 2.4
Force of XZ in direction P = 4 cos (53.1) = 2.4
Total Force in direction if p = 2.4 +2.4 =4.8 C

 

[nehaoscar]

How and why A??

 

[princess Anu]

1 = sqrt[(1+cosx)^2 + (sinx)^2]
x = 120

sqrt[(1+cosx)^2 + (sinx)^2]
How did u come up with this.. explain pls

 

[princess Anu]

how B
:s

 

[BhaiArshad]

View attachment 54927
How and why A??

The graph is a decreasing gradient curve.
you can see at the end there is less change in angle for an increase in current. That means for high current there will be less deflection. Less desflection means that the values will be close together at the end. at the beginning there is more change in angle per unit change in current. so equaldeflctlion for equal change in current.

 

[asadalam]

\
how B?

 

[DaniyalK]

sqrt[(1+cosx)^2 + (sinx)^2]
How did u come up with this.. explain pls

Pythagoras... Resultant^2 = (sum of X components)^2 + (sum of Y components)^2
When you consider option B
F2:
X comp. = 1cosx
Y comp. = 1sinx
F1 only has an x component of 1

 

[BhaiArshad]

how B
:sView attachment 54928

Fom 12:00 to 12:30 distance coveref is 100 miles
From 12:30 to 1:30 distance covered is 200 miles.
Total distance covered = 300 mile so outside of range of cambridge
Remaining distance to covere = 80 mile but we only have fuel for another 50 miles since fuel for 300 miles is used up so emergency langding.

 

[muhammadali233]

how B?

asap bro

 

[Ahmed Aqdam]

\
how B?

It is directly proportional to l and also inversely proportional to l^2.
So in overall equation it is proportional to l/l^2. Simplify to get 1/l.

 

[asadalam]

Could you elaborate?

 

[nehaoscar]

Why D??

 

[muhammadali233]

anyone?

 

[BhaiArshad]

Could you elaborate?

Delta L is amount of compression. If amount of compression is high then length of object drcreases.and vice versa.

 

[Ahmed Aqdam]

Could you elaborate?

View my previous posts by the upward arrow.

 

[BhaiArshad]

anyone?
View attachment 54931

More current = More brightness
Since if you open switch then current will no longer be divided so the current flowing in the main branch will increase. Main branch is branch containing b1 and b2

 

[princess Anu]

The shaded area is the total work done right?