A stroboscopic photograph records the position of a ball rolling along a flat bench. The flash fires every 0.10 s. The diagram shows the result. What is the...
Question 1 Report
A stroboscopic photograph records the position of a ball rolling along a flat bench. The flash fires every 0.10 s. The diagram shows the result.
What is the speed of the ball?
Answer Details
This question uses a stroboscopic photograph to determine speed. The equally spaced images show the ball moves at constant speed. There are 7 images, creating 6 intervals. Each interval is 0.10 s.
Total time = 6 × 0.10 = 0.60 s. Total distance = 30.0 cm = 0.300 m.
\[ v = \frac{d}{t} = \frac{0.300}{0.60} = 0.50 \, \text{m/s} \]As with ticker tape, the number of intervals is one less than the number of images. Using 7 intervals (0.70 s) would give 0.43 m/s, which is incorrect.
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