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tatyana61 [14]
3 years ago
14

Help with this question please

Physics
1 answer:
Assoli18 [71]3 years ago
8 0

Answer:

Your answer for this question would be AMU.

Explanation:

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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
An oil droplet is levitated and held at rest in a region where the electric field is 1.4x104 N/C directed vertically downwards.
Ratling [72]

W = m g     weight of drop

W = q E

m = q E / g = = 3 e E / g

m = 3 * 1.6E-19 * 1.4E4 / 9.8 = 6.96E-16 kg

8 0
3 years ago
The Electron Cloud Model shows shaded regions of probabilty where the electons most likely are at a given point in time. True Fa
melisa1 [442]

Answer:

True

Explanation:

The statement is true because According to Schrödinger it's not possible to get the exact position of where an electron is located. However, he showed from an equation that we can at determine the most likely area where an electron will be and he said they are most likely to be in the most dense area of the clouds.

7 0
3 years ago
Read 2 more answers
How many neutrons does element x have if it’s atomic number is 40 and it’s mass number is 82?
Black_prince [1.1K]
The atomic number gives you the number of protons element x has. Since the mass of protons and neutrons are almost similar(around 1 amu), the mass number can be thought of as the sum of protons and neutrons. so if element x whose atomic number is 40 has a mass number of 82, then we know that 42 of those must be neutrons.
4 0
3 years ago
What is the acceleration of a truck with a mass of 2,000 kg when its brakes apply a force of 10,000 N?
sattari [20]

Answer:

5m/s2

Explanation:

Data obtained from the question include:

m (mass) = 2000 kg

F (force) = 10000N

a (acceleration) =?

Using the formula F = ma, the acceleration of the truck can be obtained as follow:

F = ma

a = F/m

a = 10000/2000

a = 5m/s2

The acceleration of the truck is 5m/s2

8 0
4 years ago
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