Physics: Post your doubts here!

[A star]

A moving body undergoes uniform acceleration while travelling in a straight line between points
X, Y and Z. The distances XY and YZ are both 40 m. The time to travel from X to Y is 12 s and
from Y to Z is 6.0 s.

What is the acceleration of the body?

Ans is 0.37 ms-2

can you give the link of this question pls

 

[Champ101]

kia hoa bhai this is the formulae for simple harmonic motion. if it cant be solved that way than its a mechanics question out of our course i guess

Bhai apne question sahi se bhi nai para

 

[mehria]

can you give the link of this question pls

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w10_qp_12.pdf

Q8

 

[A star]

Bhai apne question sahi se bhi nai para

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_12.pdf

Q8

As hae phir theek hae

 

[mehria]

As hae phir theek hae

hahahaha cn u solve it??

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_12.pdf

Q8

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.

 

[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