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Schach [20]
3 years ago
15

Need help! Thanks for whoever answers.

Physics
2 answers:
kotegsom [21]3 years ago
7 0

Hi there!

Finding the time taken to land deals with the VERTICAL motion of the object, so we can disregard the horizontal velocity.

Use the simplified kinematic equation:

t = √2h/g

Plug in given values. Let g = 9.8 m/s²

t = √2(75)/9.8 = 3.91 sec

Hunter-Best [27]3 years ago
5 0

Answer:

2021 + 100000000

Explanation:

i o g kk ybb

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A copper transmission cable 140 {\rm km} long and 12.5 {\rm cm} in diameter carries a current of 115 {\rm A}.
SpyIntel [72]

Answer:

1. V=22.0407\ V

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Given:

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<u>We know that the resistance of a wire is given as:</u>

R=\rho.\frac{l}{a}

where:

a= cross sectional area of the wire

R=1.68\times 10^{-8}\times\frac{140000}{\pi.\frac{0.125^2}{4} }

R=0.1917\ \Omega

1.

<u>Now from the  Ohm's law:</u>

V=R.i

V=0.1917\times 115

V=22.0407\ V

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<u>From the Joules law the thermal energy generated as an effect of electrical energy is mathematically given as:</u>

<u />Q=i^2.R.t

where:

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Q=9126837\ J

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What do you think happens to kinetic energy with potential energy being increased?
swat32

Answer:

If the kinetic energy increases, the potential energy decreases, and vice-versa.

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