3 years ago

Can someone help me with this question

Physics

1 answer:

77julia77 [94]3 years ago

8 0

I didnt want to type it all so here is the link that tells you all you need to answer that question

https://kids.kiddle.co/Electron_cloud

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A knife thrower throws a knife toward a 300 g target that is sliding in her direction at a speed of 2.30 m/s on a horizontal fri

zhannawk [14.2K]

Answer:

The speed of the knife after passing through the target is 9.33 m/s.

Explanation:

We can find the speed of the knife after the impact by conservation of linear momentum:

$p_{i} = p_{f}$

$m_{k}v_{i_{k}} + m_{t}v_{i_{t}} = m_{k}v_{f_{k}} + m_{t}v_{f_{t}}$

Where:

$m_{k}$ : is the mass of the knife = 22.5 g = 0.0225 kg

$m_{t}$ : is the mass of the target = 300 g = 0.300 kg

$v_{i_{k}}$ : is the initial speed of the knife = 40.0 m/s

$v_{i_{t}}$ : is the initial speed of the target = 2.30 m/s

$v_{f_{k}}$ : is the final speed of the knife =?

$v_{f_{t}}$ : is the final speed of the target = 0 (it is stopped)

Taking as a positive direction the direction of the knife movement, we have:

$m_{k}v_{i_{k}} - m_{t}v_{i_{t}} = m_{k}v_{f_{k}}$

$v_{f_{k}} = \frac{m_{k}v_{i_{k}} - m_{t}v_{i_{t}}}{m_{k}} = \frac{0.0225 kg*40.0 m/s - 0.300 kg*2.30 m/s}{0.0225 kg} = 9.33 m/s$

Therefore, the speed of the knife after passing through the target is 9.33 m/s.

I hope it helps you!

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