Physics · Oct / Nov 2023 · Paper 41 · Question 4
0625
As printed in the paper
The question as text
A radio transmitter is a very tall, thin cylinder. It is prevented from falling over by wires which have one end fixed to the transmitter and the other end fixed in the ground. The ends of the wires in the ground are a long distance from the transmitter. Fig. 4.1 shows the transmitter and two of the wires. G transmitter ground base wire W Fig. 4.1
Read automatically from the paper; the printed page above is exact.
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4(a)(i)[1]
(point / place / position) where (all) the weight (seems to) acts
4(a)(ii)[1]
a small tilt / rotation makes G no longer vertically above the base OR small tilt / rotation produces moment (that topples transmitter)
4(b)(i)[1]
arrow(head) marked along wire W towards ground
4(b)(ii)[3]
moment = F × d AND correct indication of F and d on Fig. 4.1.
(moment is ) force × (perpendicular) distance (from base / pivot)
(moment is ) force × perpendicular distance (from base / pivot)
4(c)[1]
a use of radio waves, e.g. RFID / astronomy / Bluetooth / RADAR / wifi
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