Leading zeros (before first non-zero digit) are not significant. So 0.0034060: the first non-zero is 3, then 4,0,6 are significant, and the trailing zero after decimal is significant. Thus significant digits are 3,4,0,6,0 — 5 digits. Note: The last zero indicates precision. Answer is 5.
Explanation:
Friction acts parallel to surfaces, opposes motion. Static, kinetic, rolling friction. Depends on normal force and surface roughness. Necessary for walking, vehicles.
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