Quick questions on Combining uncertainties explained: H2 Physics Measurement

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is getting to the final absolute uncertainty?

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After combining fractional uncertainties, convert back to an absolute uncertainty by multiplying the fractional uncertainty by the calculated value of

y

What is q1?

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Two lengths

a = (12.0 \pm 0.2)\ \text{cm}

and

b = (8.0 \pm 0.2)\ \text{cm}

are added. State the result with its absolute uncertainty. [2 marks]

What is q2?

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A quantity is found from

P = \dfrac{V^2}{R}

with

V

known to

3\%

and

R

2\%

. Find the percentage uncertainty in

P

. [2 marks]

What is q3?

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A cube has side

s = (2.00 \pm 0.02)\ \text{cm}

. Find the volume and its percentage uncertainty. [3 marks]

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