Physics
The safest hammers are those with heads that are

Alloy and drop-forged steel
Welded and alloyed
Chiseled and drop forged
Cast steel and chiseled

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Physics
Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

Jet streams are typically continuous over long distances.
It is narrow band of high-velocity wind.
In summer, the polar front jet achieves its maximum force.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.

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