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umka2103 [35]
3 years ago
12

Differentiate between umbra and penumbra

Physics
1 answer:
Rina8888 [55]3 years ago
6 0

Answer:Answer :- The difference s between an umbra and a penumbra are : Umbra- It is the portion of shadow where no light reaches from the source of light due to the opaque object. ... Penumbra- It is the portion of shadow where a portion of light from the source of light reaches the opaque object in between them.

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A CD has an initial angular speed of 600 rpm. If the disc stop rotating after 4 seconds, what is its angular acceleration?
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