Wright, Mark R., 1854- · London : Longmans · leaf 28
a seconds pendulum which willkeep correct time in hot or cold weather. 7. Describe a gridiron pendulum made of zinc and iron bars. Whatmust be the ratio between the lengths of the bars of the two metals ? andwhy? 8. Water is said to have its maximum density at 4° C. Explain whatthis means. 9. In…
Physics
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