Physics (AS & A Level) · Oct / Nov 2016 · Paper 42 · Question 1
9702
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1(a)[1]
force per unit mass [1]
1(b)(i)[1]
radius/diameter/size (of Proxima Centauri) ≪ /is much less than 4.0 × 1013 km/separation (of Sun and star) or (because) it is a uniform sphere [1]
1(b)(ii)[4]
1. field strength = GM / x2 = (6.67 × 10–11 × 2.5 × 1029) / (4.0 × 1013 × 103) 2 = 1.0 × 10–14 N kg–1 [2]
2. force = field strength × mass = 1.0 × 10–14 × 2.0 × 1030 or force = GMm / x2 = (6.67 × 10–11 × 2.5 × 1029 × 2.0 × 1030) / (4.0 × 1013 × 103) 2 (C1) = 2.0 × 1016 N [2]
1(c)[2]
force (of 2 × 1016 N) would have little effect on (large) mass of Sun would cause an acceleration of Sun of 1.0 × 10–14 m s–2/very small/negligible acceleration [2]
or many stars all around the Sun (B1) net effect of forces/fields is zero (B1)
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