Physics · Oct / Nov 2021 · Paper 41 · Question 3
0625
As printed in the paper
The question as text
Fig. 3.1 shows a balloon inflated with air. Fig. 3.1 The pressure of the air at the inner surface of the balloon keeps the rubber stretched.
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3(a)[3]
any three of:
they / molecules collide with inner surface
momentum (of a molecule) changes / reverses
force exerted / impulse
force spread over area / surface or p = F / A
3(b)(i)[2]
(V2 =) p1V1 / p2 in any form or 630 × 1.0 × 105 / 1.4 × 105
450 cm3 or 4.5 × 10–4 cm3 or 0.45 dm3
3(b)(ii)[2]
any two of:
molecules move more slowly / have less kinetic energy
pressure (inside balloon) decreases or pressure is directly proportional to temperature or p ∝ T
volume is directly proportional to temperature or V ∝ T
molecular collisions less frequent
molecular collisions less violent / hard / exert smaller impulse
water / external pressure compresses balloon or
water pressure greater (and balloon compressed)
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