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2 years ago

How to solve this?. Explain the answer.

Physics

2 answers:

julsineya [31]2 years ago

8 0

The answer should be 28 pocketbooks

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No. of pocketbooks read this month = 41

No. of pocketbooks read last = 13 fewer than this month

Total no. of pocketbooks read last month = 41-13= *28*

Therefore, Liza read 28 books last month

Thank You

zaharov [31]2 years ago

5 0

If she read 41 pocketbooks this month then she read last month=41-13=28

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2 years ago

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3 years ago

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3 years ago

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3 years ago

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Answer:

68cm

Explanation:

You can solve this problem by using the momentum conservation and energy conservation. By using the conservation of the momentum you get

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M: mass of the pendulum

v1: velocity of the bullet = 410m/s

v2: velocity of the pendulum =0m/s

v: velocity of both bullet ad pendulum joint

By replacing you can find v:

$(0.038kg)(410m/s)+0=(0.038kg+4.2kg)v\\\\v=3.67\frac{m}{s}$

this value of v is used as the velocity of the total kinetic energy of the block of pendulum and bullet. This energy equals the potential energy for the maximum height reached by the block:

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h: height

By doing h the subject of the equation and replacing you obtain:

$(0.038kg+4.2kg)(9.8m/s^2)h=\frac{1}{2}(0.038kg+4.2kg)(3.67m/s)^2\\\\h=0.68m$

hence, the heigth is 68cm

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3 years ago