H2 Physic

SunnyFly SG

1)The manufacturers of a digital voltmeter give, as its specification, 'accuracy ± 1% with an additional uncertainty of ± 10mV'. The meter reads 4.072 V. How should this reading be recorded, together with its uncertainty?

Ans : (4.07 ± 0.05) V

2)A student times the fall of a small metal ball. Data for the time t taken for the ball to fall a vertical distance h from rest are given below.

h= 266 ± 1 cm

t= 0.740 ± 0.005 s

a) Use these data to determine a value to 3 s.f. of the acceleration of free fall g;

b) Determine the actual uncertainty in the value of g. Hence give a statement of g, with its uncertainty to an appropriate number of significant figures.

Can explain how to do? Thanks in advance!

wee_ws SG

Hi,

These are routine questions. You should be able to find relevant details from your school lecture notes. Thanks.

Cheers,
Wen Shih

eagle SG

These are indeed extremely routine.

Any explanations from me would be found in your notes as well, unless you have no school notes, in which case these explanations would be found in your guidebook as well.