In a number with decimal, zeroes to the right of last non-zero digit are significant.
Hence there are 4 significant digits in 3.140.
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It will take 15 s to travel 6 cm
<h3>Further explanation</h3>
Given
distance versus time graph
Required
time travel
Solution
Caterpillar motion is a straight motion with a constant speed, so that the graph between distance and time forms a diagonal line
If we look at the graph, we can determine the time taken when the distance reaches 6 cm (y axis) by drawing a line to the diagonal line and cutting the x-axis as time, and we get 15 s
Or we can also use the formula for motion at constant speed:
d = v x t
With v at point 2,5 of 2/5 m / s, so the time taken:

Answer;
c.electrons move from the wool to the rod.
Explanation;
-Atoms are generally neutral (have the same number
of protons as electrons). Substances lose electrons to become
positively charged, while other substances gain electrons to become negatively charged.
-When a plastic rod is rubbed with woolen
cloth or wool, a transfer of electrons occurs (from the wool to the rod). The rod gains electrons; thus, it
is negatively charged.
Answer:
Pure Chemistry -- is NOT considered a branch of Chemistry.
Explanation:
Second question is number 4.