Physics: Post your doubts here!

[Thought blocker]

hahahaha cn u solve it??

Use the equation of motion d = ut + 0.5at^2

equation 1 : 40 = 12u + 72a

equation 2 : 80 = 18u + 162a

[I added the distances, so that initial speed of both equations will be same]

now solve these simultaneously, and you will get 0.37 m/s^2 as the answer.

 

[mehria]

Use the equation of motion d = ut + 0.5at^2

equation 1 : 40 = 12u + 72a

equation 2 : 80 = 18u + 162a

[I added the distances, so that initial speed of both equations will be same]

now solve these simultaneously, and you will get 0.37 m/s^2 as the answer.

but y isn't the initial velocity 0?

 

[Thought blocker]

but y isn't the initial velocity 0?

lets see the motion in XY
initial velocity at x=v1
final velocity at y=v2
average velocity=distance/time
(V1+V2)/2=40/12 equation 1
simplifying it we get V1+V2=6.67

now consider motion in XZ
initial velocity at x=v1
final velocity=v3
V1+V2/2=(40+40)/(12+6)
simplifying it we get V1+V3=8.89 equation 2
subtract equation 1 from 2
i mean equation 2-equation 1
V1 is cancelled and we get V3-V2=2.22
since acceleration is constant so
acceleration in yz = acceleration in xz
= change in velocity/time
=2.22/6
=0.37


Shamjhi ?

 

[mehria]

lets see the motion in XY
initial velocity at x=v1
final velocity at y=v2
average velocity=distance/time
(V1+V2)/2=40/12 equation 1
simplifying it we get V1+V2=6.67

now consider motion in XZ
initial velocity at x=v1
final velocity=v3
V1+V2/2=(40+40)/(12+6)
simplifying it we get V1+V3=8.89 equation 2
subtract equation 1 from 2
i mean equation 2-equation 1
V1 is cancelled and we get V3-V2=2.22
since acceleration is constant so
acceleration in yz = acceleration in xz
= change in velocity/time
=2.22/6
=0.37


Shamjhi ?

oh... thnx....

 

[Thought blocker]

oh... thnx....

Abhi bhi shamaj ni ayi ?

 

[mehria]

Abhi bhi shamaj ni ayi ?

agayi samajh thnk u ... mein is mein cnfuse thi k initial velocity zero q nhi hai..

 

[Thought blocker]

agayi samajh thnk u ... mein is mein cnfuse thi k initial velocity zero q nhi hai..

Theek hain abhi agayi na shamajh
To ye q banaya ta :/

 

[mehria]

Theek hain abhi agayi na shamajh
To ye q banaya ta :/

av i feel so dumb at tyms

 

[itallion stallion]

physics dude its how the line of spectrum of hydrogen provides evidence for the existence of the descreet electron energy level in atoms

When an electron in an atom loses energy,radiations are emitted and the energy of the radiation is equal to the difference in the energy of the atom between its initial and final state.since the emitted radiation have definite energies or discrete wavelength so the energy levels are also discrete In an atom!

 

[Thought blocker]

av i feel so dumb at tyms

Can I show you one thing ?

 

[Batguy]

When an electron in an atom loses energy,radiations are emitted and the energy of the radiation is equal to the difference in the energy of the atom between its initial and final state.since the emitted radiation have definite energies or discrete wavelength so the energy levels are also discrete In an atom!

thanx dude :'')

 

[mehria]

Can I show you one thing ?

ya sure

 

[Thought blocker]

ya sure

Nice dp... Wait, lemme type

 

[mehria]

Nice dp... Wait, lemme type

lol...ok

 

[Thought blocker]

lol...ok

Is voltage a vector or scalar quantity?
Answer:
In DC(direct current) circuits, voltage is scalar. But in the case of alternating-current(AC) voltage is vector quantity. It is because in an AC circuit the current is changing the direction for every time period. Therefore, since in this the direction matters its a vector quantity.
Regards.


#==>Why isnt it the same for current that current is vector in Ac but scalar in DC

 

[mehria]

Is voltage a vector or scalar quantity?
Answer:
In DC(direct current) circuits, voltage is scalar. But in the case of alternating-current(AC) voltage is vector quantity. It is because in an AC circuit the current is changing the direction for every time period. Therefore, since in this the direction matters its a vector quantity.
Regards.

#==>Why isnt it the same for current that current is vector in Ac but scalar in DC

current is the flow of charges per unit tym.. the direction is chnging but the number of charges remains the same...
idk the exact explanation for ths... :/

 

[Thought blocker]

current is the flow of charges per unit tym.. the direction is chnging but the number of charges remains the same...
idk the exact explanation for ths... :/

Np..

 

[mehria]

Np..

Vectors are that quantities, in which magnitude or value is changed with direction... so for current the direction chnges but nt the value... that's the reason why it's nt a vector quantity. although it behaves as a vector quantity in ac circuits...

 

[Rutzaba]

me no physics

 

[Thought blocker]

Ok jee