Edexcel PHYSICS Doubts

[xainer]

22cii

Thank you! It was very helpful!

[astarmathsandphysics]

no probs

[xainer]

Can anyone please give me the answer for these qustns.
a) A car of mass 1200kg is in a crash. The front bumper of the car deforms and the car is brought to rest from an initial speed of 10m/s in a distance of 0.12m. by considering the workdone on the car as it s brought to rest, calculate the average impact force that acts.
b) Modern cars crumple zones to reduce the size of the impact force. Suggest how the crumple zones do this.

[astarmathsandphysics]

xainer here you are

[xainer]

xainer here you are

thanks! but why does longer distance decrease the value of F?

[xainer]

thanks! but why does longer distance decrease the value of F?

is it because force is inversely proportional to the distance according to the equation??
what's the concept behind it?

[astarmathsandphysics]

Force is inversely proportional to distance because force times distance equalsenergy which is constant

[xainer]

Oh! Thanks a lot

[astarmathsandphysics]

Suggest you read my post above again. V bad English.

[jenifer911]

Hi everyone,

Could any one solve the following problem for me??? it can be found on the edexcel a2 physics book p.41 Questions 4.

4. In the electron beam of a CRO, electrons are accelerated through a potential difference of 3000V which is set up between electrodes 3cm apart.
a)Calculate the electric field strength, assuming it is a uniform field
b) How fast will the electrons be moving when htey emerge from this field?

Im having problems with (b), the answer 1.62 x 10^7 m s-1 while my calculations are double it i.e. 3.25X10^7ms-1

Thx in advance!!

[yo2646126]

...

[jenifer911]

Oh my mistake, thanks:)

[astarmathsandphysics]

Hi everyone,

Could any one solve the following problem for me??? it can be found on the edexcel a2 physics book p.41 Questions 4.

4. In the electron beam of a CRO, electrons are accelerated through a potential difference of 3000V which is set up between electrodes 3cm apart.
a)Calculate the electric field strength, assuming it is a uniform field
b) How fast will the electrons be moving when htey emerge from this field?

Im having problems with (b), the answer 1.62 x 10^7 m s-1 while my calculations are double it i.e. 3.25X10^7ms-1

Thx in advance!!

a)E=V/d=3000/0.03=100000 V/m
b)
so

[studx3m]

hey ppl!! m really really struggling with uncertainty precision and accuracy calculations!!!! please help meee (a2 unit 6 edexcel)
also can anyone tell me why the answer is C to may 2010 unit 3b edexcel physics??
m a private student in physics! so i have no idea how to prepare for unit 6!!! any practicals that i have to know??

[astarmathsandphysics]

I dont have the paper and it is not on the edexcel website.
Canyou post it?