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AURORKA [14]
2 years ago
14

A target in a shooting gallery consists of a vertical square wooden board, 0.250 m on a side and with mass 0.750 kg, that pivots

on a horizontal axis along its top edge. the board is struck face-on at its center by a bullet with mass 1.90 g that is traveling at 385 m/s and that remains embedded in the board. (a) what is the angular speed of the board just after the bullet's impact?
Physics
1 answer:
Alenkasestr [34]2 years ago
8 0

Here in this case since there is no torque about the hinge axis for the system of bullet and block then we can say that angular momentum of this system will remain conserved

L_i = L_f

mv \frac{L}{2} = (I_1 + I_2)\omega

here we will have

L = 0.250 m

v = 385 m/s

m = 1.90 gram

now moment of inertia of the plate will be

I_1 = \frac{ML^2}{3}

I_1 = \frac{0.750 (0.250)^2}{3} = 0.0156 kg m^2

I_2 = m(\frac{L}{2})^2 = 0.0019(0.125)^2 = 2.97 \times 10^{-5} kg m^2

now from above equation

0.0019 (385)(0.125) = (0.0156 + 2.97 \times 10^{-5})\omega

\omega = 5.85 rad/s

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Answer:

unknown

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In the question above, the given statement represents that the Psi communication is responsible for transforming via an unknown process as one of its members are considered as unknown of the transfer, so the correct answer would be "unknown process".

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2 years ago
A laser emits two wavelengths (λ1 = 420 nm; λ2 = 630 nm). When these two wavelengths strike a grating with 450 lines/mm, they pr
Harlamova29_29 [7]

Answer:

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b) At what angle does this overlap occur = 34.54 degree

Explanation:

The detailed steps and appropriate formula is as shown in the attachment.

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2 years ago
A lead fishing weight of mass 0.2 kg is tied to a fishing line that is 0.5 m long. the weight is then whirled in a vertical circ
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In the movement of the weight in vertical circle, using momentum balance, the largest tension is at the bottom of the circle. This is represented by: 

<span>F = T - m g </span>
<span>T = F + m g 
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<span>m v^2 / r = T - m g </span>
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7 0
2 years ago
The energy transfer diagram shows energy transfer in an MP3 player. Useful energy is transferred away from the MP3 player by lig
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To determine the height of a flagpole, Abby throws a ball straight up and times it. She sees that the ball goes by the top of th
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Answer:

H = 10.05 m

Explanation:

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so here the total time of the motion above the top point of pole is given as

\Delta t = 4.1 - 0.5 = 3.6 s

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3.6 = \frac{2v}{9.8}

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so this is the speed at the top of flag pole

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5 0
2 years ago
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