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Nutka1998 [239]
4 years ago
7

How long will it take a car to go from a complete stop to 44 m/s if they are

Physics
1 answer:
mafiozo [28]4 years ago
7 0

Answer:

\boxed{\sf Time \ taken \ (t) = 8.8 \ s}

Given:

Initial velocity (u) = 0 m/s

Final velocity (v) = 44 m/s

Acceleration (a) = 5 m/s²

To Find:

Time taken (t)

Explanation:

From equation of motion we have:

\boxed{ \bold{v = u + at}}

By substituting value of u, v & a in the equation we get:

\sf \implies 44 = 0 + 5t \\  \\  \sf \implies 44 = 5t \\  \\  \sf \implies 5t = 44 \\  \\  \sf \implies t =  \frac{44}{5}  \\  \\  \sf \implies t = 8.8 \: s

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solniwko [45]
Higher

Electronegativity generally increases from the left of the P.T.(metals) to the right (nonmetals).
7 0
3 years ago
An aluminum wire is held between two clamps under zero tension at room temperature. Reducing the temperature, which results in a
Blababa [14]

Answer:

\frac{\Delta L}{L} =5.37\times 10^{-4}

Explanation:

Given:

  • cross sectional area of the wire, A=5.75\times 10^{-6}\ m^2
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  • young's modulus of the material, E=7\times 10^{10}\ N.m^{-2}
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<u>We have mathematical expression for strain as:</u>

\frac{\Delta L}{L} =\frac{\sigma}{E} ...............................(1)

and since, \sigma =\frac{T}{A}

where, T = tension force in the wire

equation (1) becomes:

\frac{\Delta L}{L} =\frac{T}{A.E} ............................(2)

<u>Also velocity ofwave in tensed wire:</u>

v=\sqrt{\frac{T}{\mu} } ...................................(3)

where: \mu= linear mass density of the wire

\therefore \mu=\rho \times A

Now, equation (3) becomes

v=\sqrt{\frac{T}{\rho \times A} }

T=v^2.\rho \times A ............................(4)

Using eq. (2) & (4) for tension T

v^2.\rho \times A=A.E\times \frac{\Delta L}{L}

\frac{\Delta L}{L} =\frac{v^2.\rho}{E}

putting the respective values

\frac{\Delta L}{L} =\frac{118^2\times 2.7\times 10^3}{7\times 10^{10}}

\frac{\Delta L}{L} =5.37\times 10^{-4}

6 0
3 years ago
what is the period of a sound wave whose wavelength is 20.0m? use values from the book and show all of your work
Lera25 [3.4K]
The wavelength of a sound wave is related to its frequency by the relationship:
f= \frac{v}{\lambda}
where
f is the frequency
v is the speed of the wave
\lambda is the wavelength

The wave in our problem has wavelength of \lambda=20.0 m and speed of v=343 m/s (this is the speed of sound in air), therefore its frequency is
f= \frac{343 m/s}{20.0 m}=17.15 Hz

And the period of the wave is equal to the reciprocal of its frequency:
T= \frac{1}{f}= \frac{1}{17.15 Hz}=0.058 s
5 0
4 years ago
Which of the following factors influence the electrical resistance of a circuit?
stealth61 [152]
-- material and thickness of the interconnecting wires;

-- number, type, and configuration of all the devices
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the points that connect to the battery;

-- quality of the connections at the points where
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5 0
3 years ago
What are the harmful effects of drugs in the body?​
snow_lady [41]

Explanation:

causes hallucinations

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6 0
3 years ago
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