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Physics: Post your doubts here!

Thought blocker

Thought blocker

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Rockstar RK

Rockstar RK

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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?
A 0.37 m s–2 B 0.49 m s–2 C 0.56 m s–2 D 1.1 m s–2
 
Rockstar RK

Rockstar RK

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Ahmed Aqdam said:
Charge=Force/Electric field strength
Mass=Force/acceleration
Force will cancel so E/g

Charge is negative as weight acts downwards and as it is in equilibrium an upward force acts to counterbalance it. It will be towards positive charge so drop is negative.
Click to expand...
Please anwer this:
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?
A 0.37 m s–2 B 0.49 m s–2 C 0.56 m s–2 D 1.1 m s–2
 
not.maria

not.maria

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Thought blocker said:
11)
The angle that T1 makes with R is greater than the angle that T2 makes with R.
R has to be balanced by the horizontal componts of T1 and T2
Let the angle be θ
R= T1cosθ + T1cosθ and R= T2cosθ + T2cosθ
We can see that for cos,, the greater the angle.. less the value of cosθ
so in order to cancel out R the value of T1 must be greater as cos θ is less in diagram 1. Therefore T1>T2

28)
F= Eq
F = 3 x 10^7 x 1.6 x 10 ^(-19)
F = A

the q is always the charge of the charge that is moving, not the charge of the electric field

39)
It can not be A cause there is suppose to be a deflection not B cause they weight the same not D cause alpha particles are postive and so is the gold necule they repel and not attract so it is JUST C
Click to expand...
just to clear things up:)
the ans to 39 is B not C
you have written C and explained for C to be correct
Markscheme
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w09_ms_12.pdf
 
ZaqZainab

ZaqZainab

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not.maria said:
why not A or C
Click to expand...
A has no deflection for the second one and that is wrong as both the gold nucleus and alpha particle carry + change there is suppose to deflection
C as i said the closer you get to the nucleus the stronger the push
in C both the particles are deflected with the same angle which is wrong as the one on the top is further away from the nucleus while the one on the bottom is closer
 
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