Physics: Post your doubts here!

[Thought blocker]

Yup it is. The part where it says retarding force of "60 N is applied to the trolley." is a bit blurred

I d k this one I am in hurry, catch u later. I'll solve it, Its easy

 

[unique111]

It's okay, bro. Someone else will extend their helping hand. * you're my genius though

 

[Thought blocker]

It's okay, bro. Someone else will extend their helping hand. * you're my genius though

No need. I got it.
a = F / m => a = -60N /30kg = -2m/s^2 (the force and acceleration are negative b/c the force opposes motion and the trolley slows down)
a = (change is velocity) / time => -2m/s^2 =[ v(f) - 3.0m/s] / 0.5s. Solving for V(f) we have: v(f) = 2m/s

 

[unique111]

No need. I got it.
a = F / m => a = -60N /30kg = -2m/s^2 (the force and acceleration are negative b/c the force opposes motion and the trolley slows down)
a = (change is velocity) / time => -2m/s^2 =[ v(f) - 3.0m/s] / 0.5s. Solving for V(f) we have: v(f) = 2m/s

wohoo! thanks

 

[Thought blocker]

wohoo! thanks

Np

 

[Thought blocker]

unique111

 

[Thought blocker]

unique111

 

[ZaqZainab]

I dont know this , Help - usama321 Suchal Riaz snowbrood ZaqZainab asma tareen The Godfather

Looks like i am late XD

 

[Thought blocker]

sorry Thought blocker but i dont take bio

I haven't ask u anything

 

[Thought blocker]

than who tagged me sorry let me see again

It was a mistake tag, it was an answer for unique111

 

[Thought blocker]

I said, it was a mistake tag.

 

[usama321]

Can somebody help me with this? It seems quite easy, cause its in number 5, but i couldn't figure out where to start from. Much help appreciated.

V2=U2+2as
V2=0+2*0.2*1000=400 'Change 1km to m'
V=Root of 400
V=20m/s

actually v square would be zero as it is the final speed, and you are finding the initial speed which is u.. You got the right answer in this case, but it could just as well have been wrong. u is initial and v is final

 

[Thought blocker]

actually v square would be zero as it is the final speed, and you are finding the initial speed which is u.. You got the right answer in this case, but it could just as well have been wrong. u is initial and v is final

Thanks for correction

 

[Ali_00921]

May June 2013 52.
Q1. Can someone draw.the.diagram.
Please. Thank You In Advance

 

[TheStallion-Reborn]

Can anyone kindly provide links to some notes worth going through?

 

[Thought blocker]

Can anyone kindly provide links to some notes worth going through?

 

[Muskan Achhpilia]

Hey, can someone please help me in the following mcq...

In a laboratory experiment in which a feather falls from rest in a long evacuated
vertical tube of length L.

The feather takes time T to fall from the top to the bottom of the tube.

How far will the feather have fallen from the top of the tube in time 0.50 T?
A 0.13 L B 0.25 L C 0.38 L D 0.50 L

Answer is B

thanks a lot!!

 

[usama321]

Hey, can someone please help me in the following mcq...

In a laboratory experiment in which a feather falls from rest in a long evacuated
vertical tube of length L.

The feather takes time T to fall from the top to the bottom of the tube.

How far will the feather have fallen from the top of the tube in time 0.50 T?
A 0.13 L B 0.25 L C 0.38 L D 0.50 L

Answer is B

thanks a lot!!

L = 1/2 aT^2

Only the time changes now, from T to 0.5 T..

s = 1/2 a 0.25T^2

L/s = 1/0.25
0.25L

 

[Suchal Riaz]

Hey, can someone please help me in the following mcq...

In a laboratory experiment in which a feather falls from rest in a long evacuated
vertical tube of length L.

The feather takes time T to fall from the top to the bottom of the tube.

How far will the feather have fallen from the top of the tube in time 0.50 T?
A 0.13 L B 0.25 L C 0.38 L D 0.50 L

Answer is B

thanks a lot!!

 

[Snow Angel]

No one helping me .I m crying.

i think for 6 b) since T is 0.25T. the wave will move a quarter distance i.e the starting point will be at 20 and finish at 100.