Flora H.

asked • 02/22/21

physics question?

A frustrated physics student blew up her Physics textbook using a small amount of explosive. It broke into three pieces, which miraculously flew off in directions that were all in the same plane. A 0.200 kg piece flew off at 20.0 m/s and a 0.100 kg piece went off at 90° to the first piece, at 30.0 m/s.

a) What was the momentum of the third piece?

b) If the mass of the third piece was 0.150 kg, what was its velocity right after the explosion?

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Inactive Tutor answered • 02/22/21

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Hope this helps, anybody free to correct me if I misspoke at any point. Thanks for your time.

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Flora H.

I just found the answer key to this problem, and the answer to part a is 5kgm/s, and i understand how to do part b
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02/22/21

Inactive Tutor

My bad I see how the third is combination of two which is correct, but in order to get the correct monument you take the magnitude using P1=P3x & P2= P3y. P3 = sqrt( P3x^2 + P3y^2) Which is 5 kg*m/s. The negative is because of the direction which it doesn’t ask for, but it is important to note.
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02/22/21

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