Question

Using the black numbers on the stopwatch to answer the questions.

What is the most accurate reading of seconds as indicated by the long second hand?



Look at the divisions between 2 and 4. What level of precision does this stopwatch have based on the divisions marked on its face?

Answer 1

I don't see the stopwatch image — could you upload it or tell me where the long second hand is pointing (e.g. "a little past the 3, about 4 small ticks past")? That will let me give the exact reading.

Meanwhile, here is how to get both answers yourself:

1) How to read the most accurate seconds value from the long second hand
- Find the nearest numbered mark to the left of the hand (call that base seconds).
- Count how many small divisions (ticks) from that base mark to the hand.
- Multiply the number of ticks by the value of one tick (see step 2), then add to the base seconds.
- Report the value to the nearest tick (that is the most accurate reading the instrument gives).

Example: if the hand is 3 small ticks past the 3-second mark and each small tick = 0.1 s, the reading is 3.0 + 3×0.1 = 3.3 s.

2) How to determine the stopwatch’s precision from the divisions between 2 and 4
- The arc from 2 to 4 represents 2 seconds. Count how many equal small divisions (small spaces) lie between the 2 and the 4 marks.
- Precision (one tick) = 2 seconds ÷ (number of small divisions between 2 and 4).

Examples:
- If there are 10 small divisions between 2 and 4 → one tick = 2 ÷ 10 = 0.2 s precision.
- If there are 20 small divisions → one tick = 0.1 s precision.
- If there are 5 divisions → one tick = 0.4 s precision.

If you upload the picture or describe exactly where the long hand sits and how many small ticks you see between 2 and 4, I’ll compute the precise reading and the stopwatch’s precision for you.