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As percentage uncertainty is same for all values, the actual uncertainty will be least when θ is least.
u = 10 , v = 20 , s = 100A car is travelling with uniform acceleration along a straight road. The road has marker posts every 100m. When the car passes one post , it has a speed of 10m/s and , when it passes the next one , its speed is 20m/s
What is the car acceleration ?
A.0.6m/s^2
B.1.5m/s^2
C.2.5m/s^2
D.6.0m/s^2
(from marking scheme answer is (B:1.5m/s^2)[June 2004 paper 1 number 7]
Thanksu = 10 , v = 20 , s = 100
using v^2 = u^2 + 2as
a = 1.5
For an object in equilibrium, the forces acting on it has to have a concurrent point which means they have to have a common point of intersection. If you extend the forces they should intersect at a common point. For A there is no concurrent pointView attachment 54688
Why cant't A be in equilibrium??
Is it C?PLZ HELP !
Percentage uncertainty of current= 0.05/2.5 * 100=2%In a simple electrical circuit , the current in a resistor is measured as (2.50 ± 0.05) mA. The resistor is marked as having a value of (4.7 Ω ± 2%).
If these values were used to calculate power dissipated in the resistor , what would be the percentage uncertainty in the value obtained ?
A.2%
B.4%
C.6%
D.8%
From marking scheme (Ans :C 6%)[Jun 2004 paper 1 number 6]
Area is reduced four times so so length must increase four times as volume remains same.
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