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3 years ago

Could someone help me with this?

Physics

1 answer:

masya89 [10]3 years ago

6 0

Answer:

46,502,000 times

Explanation:

The question asked how many times back <em>and </em>forth, so you divide by 2 (so in half); and if it's 93,004,000 then you divide that by 2 which equals, 46,502,000.

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Two wires are identical, except that one is aluminum and one is tungsten. the aluminum wire has a resistance of 0.22 ω. what is

Margaret [11]

The resistance R of a piece of wire is given by
$R=\rho \frac{L}{A}$
where $\rho$ is the resistivity of the material, L is the length of the wire and A is its cross-sectional area.

Using this formula, and labeling with A the aluminum and with T the tungsten wire, we can write the ratio between $R_T$ (the resistance of the tungsten wire) and $R_A$ (the resistance of the aluminum wire):
$\frac{R_T}{R_A}= \frac{\rho_T \frac{L}{A} }{\rho_A \frac{L}{A} }$

the two wires are identical, so L and A are the same for the two wires and simplify in the ratio, and we get:
$R_T = \frac{\rho_T}{\rho_A} R_A$

By using the resistivity of the aluminum: $\rho_A=2.65 \cdot 10^{-8} \Omega m$ and the resistivity of the tungsten: $\rho_T = 5.6 \cdot 10^{-8} \Omega m$ m we can get the resistance of the tungsten wire:
$R_T = \frac{\rho_T}{\rho_A} R_A = \frac{ 5.6 \cdot 10^{-8} \Omega m}{2.65 \cdot 10^{-8} \Omega m} (0.22 \Omega) = 0.46 \Omega$

5 0

3 years ago

Given two vectors A⃗ =4.00i^+7.00j^ and B⃗ =5.00i^−2.00j^ , find the vector product A⃗ ×B⃗ (expressed in unit vectors).

Reptile [31]

Answer:

$-43\hat{k}$

Explanation:

given,

$\vec{A} = 4 \hat{i} + 7 \hat{j}$

$\vec{B} = 5 \hat{i} - 2 \hat{j}$

vector product $\vec{A} \times \vec{B} = ?$

$\vec{A} \times \vec{B}$ = $\begin{bmatrix}i & j & k\\ 4 & 7 &0 \\ 5 & -2 & 0\end{bmatrix}$

now, expanding the vector

$\vec{A} \times \vec{B}= \hat{k}(-2\times 4 - 7\times 5)$

$\vec{A} \times \vec{B}= -43\hat{k}$

the vector product is equal to $-43\hat{k}$

4 0

4 years ago

Explain how you think humans have disrupted the nitrogen cycle HELP QUICK DUE APRIL 15TH ANYBODY

mina [271]

Answer:

Scientists have determined that humans are disrupting the nitrogen cycle by altering the amount of nitrogen that is stored in the biosphere. The chief culprit is fossil fuel combustion, which releases nitric oxides into the air that combine with other elements to form smog and acid rain.

5 0

3 years ago

Will a vector at 45 degrees to the horizontal be larger or smaller than its horizontal and vertical components? By how much?

never [62]

Larger. How big depends on the size of the vector. But think about pythagoras theorem to solve for the vector.

8 0

3 years ago

A summary of a source is usually

Mekhanik [1.2K]

Answer:

A shorter than the original source and in the researcher's words

Explanation:

The summary is an abridged version of the original source and in the researcher's own very words.

Summaries gives an over-arching perspective and excludes implicit details from a given text.

A summary should not be detailed and must avoid overt illustrations. They must capture the true essence of piece leaving out flowery details.

A summary should be lesser in length than the original piece. Any third party reader should immediately be able to grab the details of the original piece from the summary.

5 0

3 years ago

Read 2 more answers