Hover or tap underlined Spanish terms to see their translation and exam tip.
Encontrándonos en un punto de sonda en la carta de 6 metros, obtenemos del anuario de mareas la siguiente lectura: Hora de la pleamar=12:10, altura de la pleamar=3,3 metros. Hora de la bajamar= 18:20, altura de la bajamar=0,40 metros. ¿Cuál de las siguientes respuestas más se aproxima a la sonda en el momento a las 12:30?At a point with a charted sounding of 6 metres, we read from the tide tables: High water = 12:10, height 3.3 metres. Low water = 18:20, height 0.40 metres. Which answer is closest to the sounding at 12:30?
Show the answer
Correct answer: c) 9.28 metres.
Why it is correct
D = 6h 10m and t = 20m. h = 1.85 + 1.45 × cos(10º) = 3.28 m. Sounding: 6 + 3.28 = 9.28 m.
Why the others are not
- a) It does not match the working.
- b) It does not match the working.
- d) It does not match the working.
How to work it out in the exam
- Find t, the time since the first tide, and D, the duration between them.
- h = mean + (first − second) / 2 × cos(180º × t / D).
- Sounding = charted sounding + h.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de noviembre · PY Test 1 · question 40 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de noviembre · PY Test 2 · question 37 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.