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mrs_skeptik [129]

3 years ago

9

An image seen in a smooth dinner plate is an example of ____ reflection.

1 answer:

spayn [35]3 years ago

8 0

The correct answer is letter C, regular reflection.

<span>An image seen in a smooth dinner plate is an example of a regular reflection. This phenomenon only occurs in smooth and polished surfaces. During this stage light occurs at a certain angle and is reflected back at the same angle producing reflections in a way like a mirror does this commonly.</span>

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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

If mechanical energy is conserved in a system the energy at any point in time can be in the form of

I am Lyosha [343]

potential, kinetic, elastc energies

6 0

3 years ago

A stretched string is 2.11 m long and has a mass of 19.5 g. When the string oscillates at 440 Hz , which is the frequency of the

blsea [12.9K]

Answer:

The tension of the string is 41.876 N

Explanation:

Given;

length of the string, L = 2.11 m

mass of the string, m = 19.5 g = 0.0195 kg

frequency of the wave, f = 440 Hz

wavelength, λ = 15.3 cm = 0.153 m

The velocity of the wave is given by;

v = fλ

v = 440 x 0.153

v = 67.32 m/s

Also the velocity of the wave is given by

$v = \sqrt{\frac{T}{\mu} }$

where;

μ is mass per unit length = 0.0195 / 2.11 = 0.00924 kg/m

T is the tension of the string

T = v²μ

T = (67.32)²(0.00924)

T = 41.876 N

Therefore, the tension of the string is 41.876 N

5 0

4 years ago

According to the law of conservation of mass, which of these is true.

dimaraw [331]

C because mass is how much space an object takes up

8 0

4 years ago

Rank the pressures from highest to lowest:

n200080 [17]

Answer:

P₃ > P₁ > P₂

Explanation:

To rank pressure of the given situation

a) we know

Pressure at height h below

P = ρ g h

density of salt water, ρ = 1029 kg/m³

P₁ = 1029 x 10 x 0.2

P₁ = 2058 Pa

b) density of fresh water, ρ = 1000 kg/m³

P₂ = 1000 x 10 x 0.2

P₂ = 2000 Pa

c) density of mercury, ρ = 13593 kg/m³

P₃ = 13593 x 10 x 0.05

P₃ = 6796.5 Pa

Rank of Pressures from highest to lowest

P₃ > P₁ > P₂

3 0

3 years ago