Easy -1.2 This is a straightforward single-step calculation requiring only the basic formula P = W/t where W = mgh. The values are given directly with minimal unit conversion (cm to m, days to seconds), making it significantly easier than a typical A-level mechanics question which would involve multiple steps or problem-solving.
1 A clock is driven by a 5 kg sphere falling once through a vertical distance of 120 cm over 2 days.
Calculate, in watts, the average power developed by the falling sphere.
Question 1:
1 | 5(cid:117)9.8(cid:117)1.2
Power is = 0.00034027…W
2(cid:117)24(cid:117)3600
0.000 340W (3 s.f.) | M1
B1
M1
A1
[4] | 1.2
1.1a
3.4
1.1 | Power is WD/time
WD is mgh
Units put into SI
Accept e.g. 341μW (3 s.f.) Don’t
insist on W
1 | 3 | 0 | 0 | 1 | 4
1 A clock is driven by a 5 kg sphere falling once through a vertical distance of 120 cm over 2 days.
Calculate, in watts, the average power developed by the falling sphere.
\hfill \mbox{\textit{OCR MEI Further Mechanics A AS Q1 [4]}}