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Physics help A2

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nid404:
yup yup paper 4  ;D

Light:
3a) field strength is equal to the negative potential gradient.(its the concept u need to know)
b)find the area under graph by counting boxes.more than half counted as 1 box,less than half box not counted.calculate area of a box multiply with no of boxes.
c)use kinetic energy equals to electric potential energy.½mv2 = qV
½ × 9.1 × 10–31 × v2 = 1.6 × 10–19 ×  530(u should get this value in b)
v = 1.37 × 107 ms–1
d)the gradient of graph indirectly shows the acceleration.d=0 ,it is steepest at that point.
from graph ,acceleration decreases(negative gradient) and increases(positive gradient).minimum at 4cm.

nid404:

--- Quote from: Light on July 14, 2010, 12:59:38 pm ---3a) field strength is equal to the negative potential gradient.(its the concept u need to know)
b)find the area under graph by counting boxes.more than half counted as 1 box,less than half box not counted.calculate area of a box multiply with no of boxes.
c)use kinetic energy equals to electric potential energy.½mv2 = qV
½ × 9.1 × 10–31 × v2 = 1.6 × 10–19 ×  530(u should get this value in b)
v = 1.37 × 107 ms–1
d)the gradient of graph indirectly shows the acceleration.d=0 ,it is steepest at that point.
from graph ,acceleration decreases(negative gradient) and increases(positive gradient).minimum at 4cm.

--- End quote ---

a little late...but thanks :) + rep

Ghost Of Highbury:
A thermometer can be read to an accuracy of ±0.5 °C. This thermometer is used to measure a
temperature rise from 40 °C to 100 °C.
What is the percentage uncertainty in the measurement of the temperature rise?
A 0.5 % B 0.8 % C 1.3 % D 1.7%

Alpha:

--- Quote from: Ghost Of Highbury~ on July 28, 2010, 02:44:40 pm ---A thermometer can be read to an accuracy of ±0.5 °C. This thermometer is used to measure a
temperature rise from 40 °C to 100 °C.
What is the percentage uncertainty in the measurement of the temperature rise?
A 0.5 % B 0.8 % C 1.3 % D 1.7%

--- End quote ---

I'm not sure... Engraved or Astar can check.  :-\

But still.

Rise = 60 °C

+ 0.5 or -0.5 => Interval = 1 °C

% uncertainty = 1/60 °C *100% = 1.7%

Have the MS?

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