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Sergio [31]
3 years ago
15

The speed of a moving bullet can be deter-

Physics
1 answer:
solmaris [256]3 years ago
3 0

Answer:

v=16.806\ m/s

Explanation:

<u>Rotational Motion </u>

An object is said to have rotational motion is it moves at the same distance to a fixed point called the center. The distance is called radio and the number of revolutions (or radians) it makes over time is called angular speed. Knowing the angle \theta it makes in a certain time t, the angular speed is

\displaystyle w=\frac{\theta}{t}

If we wanted to know the time it takes to describe some angle, we solve for t

\displaystyle t=\frac{\theta}{w}..........[1]

Two rotating paper disks are mounted at a distance of x= 81 cm = 0.81 m. If we knew the time the bullet take from one to the other, we could determine the speed of the bullet

\displaystyle v=\frac{x}{t}.............[2]

We can determine the time taken between the disks knowing their angular speed and the angle formed in the interval. Replacing the time from [1] into [2]

\displaystyle v=\frac{x}{\frac{\theta}{w}}

\displaystyle v=\frac{xw}{\theta}

We have the values

\theta=13.7^o=13.7/(2\pi)=2.18\ rad

w=432\ rev/min=432*2\pi /60=45.239\ rad/s

Thus

\displaystyle v=\frac{(0.81)(45.239)}{2.18}

\boxed{v=16.806\ m/s}

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kipiarov [429]
Given:
Dy= 20 m
Vi = 5.0 m/s horizontally
A=9.81 m/s^2

Find:
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Solution:
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T^2=Dy/(1/2)A
T=sqrt(Dy/(1/2)A)
T=sqrt(20/4.905)
T=2.0s

Dx=ViT
Dx=(5.0)(2.0)
Dx=10. meters
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Answer: The decibel scale is a logarithmic scale where each bel or 10 decibels correspondents to a factor of ten. A power intensity of 10^(-12) watts per square meter is the standard reference for a SPL of 0 db. So an SPL of 98 db corresponds to a power intensity of 10^(9.8)*10^(-12) or 10^(9.8–12) w/m^2.

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You can also readily find the value for any given SPL using the online calculator at: http://www.sengpielaudio.com/calculator-soundlevel.htm

Explanation:

7 0
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false

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You are working on charge-storage devices for a research center. Your goal is to store as much charge on a given device as possi
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Answer:

Part A the answer is the dielectric constant.

Part B  Mica- mylar- paper- quartz

Explanation:

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Where the dielectric constant (ε) is the value of the material between the plates of the capacitor, we see that as if value increases the capacity also increases.

Another magnitude that we must take into account that the maximum working voltage, the greater the safer is the capacitor

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Part A the answer is the dielectric constant.

Pate B order the materials from best to worst

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KatRina [158]

Answer:

Helloooo

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Explanation:

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