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Sliva [168]
3 years ago
10

What must occur within a magnetic material before it exhibts magnetic properties?

Physics
1 answer:
erma4kov [3.2K]3 years ago
3 0

Answer:

Option C, The magnetic domains inside the material must be aligned

Explanation:

Magnetic domains determine the magnetic behavior of any substance. Most of the magnetic substances have disoriented magnetic domains due to which they do not behave as magnets until unless an external force is applied to change the orientation of their domains and align them properly.

Hence, option C is correct

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A thin, uniform metal bar, 2.00 m long and weighing 90.0 N, is hanging vertically from the ceiling by a frictionless pivot. Sudd
matrenka [14]

Answer:

(a) The "angular speed" is 5.88 rad/s.

Explanation:

Given values,

The length of the bar is L = 2m

The weight of the bar is w = 90 N

The metal bar is hanging vertically from the ceiling by a frictionless pivot  

The mass of the ball is m = 3kg

The distance between the ceiling and the ball is d = 1.5m

\text { The "initial speed of the ball" is } V_{i}=10 \mathrm{m} / \mathrm{s}

\text { The "final speed of the ball" is } V_{f}=6 \mathrm{m} / \mathrm{s}

(a) Calculating the angular speed:    

W_{\mathrm{f}}=\left(3 \mathrm{mg} \mathrm{d} \frac{V_{i}+V_{f}}{w l^{2}}\right)

W_{f}=\left(3 \times 3 \times 9.8 \times 1.5 \times \frac{10+6}{90 \times 2^{2}}\right)

W_{f}=\frac{2116.8}{360}

\mathrm{W}_{\mathrm{f}}=5.88 \mathrm{rad} / \mathrm{s}

The angular speed is 5.88 rad/s.

(b) The "angular momentum" is conserved because the torque is not exerted by "the pivot" on the system about the "axis of rotation" but the "linear momentum" is not conserved because "the pivot" exerts a "vertical" and a "horizontal force" on the system during the collision.

8 0
4 years ago
A hiker begins a trip by first walking 25.0 km southeast from her car. She stops and sets up her tent for the night. On the seco
Sunny_sXe [5.5K]

Answer:

(a)

x_1=17.68km\\y_1=-17.68km\\x_2=20km\\y_2=34.64km

(b) r=41.32km

\alpha =24.23^o

Explanation:

Let us take the north direction to be the positive y-axis and the east to be positive x-axis.

First day:

25.0 km southeast, which implies 45^o south of east. The y-component will be negative and the x-component will be positive.

x_1=25cos45^o=17.68km

y_1=-25sin45^o=-17.68km

Second day:

She starts off at the stopping point of last day. This time, both the y- and x-components are positive.

x_2=40cos60^o=20km

y_2=40sin60^o=34.64km

Therefore, total displacements:

x=x_1+x_2=(17.68+20)km=37.68km

y=y_1+y_2=(-17.68+34.64)km=16.96km

Magnitude of displacements,

r=\sqrt{x^2+y^2}=41.32km

Direction,

\alpha =tan^{-1}(\frac{y}{x})=24.23^o

6 0
4 years ago
The average intensity of light emerging from a polarizing sheet is 0.775 W/m2, and that of the horizontally polarized light inci
rewona [7]

Answer:

the transmission axis of polarizing sheet makes an angle of \Theta =26.74^{\circ} with the horizontal        

Explanation:

We have given that intensity of light incident on the sheet I_0=0.970W/m^2

Average intensity of light emerging from a polarizing sheet I=0.775W/m^2

We have to find the angle between transmission axis with the horizontal

Intensity of light polarizing from sheet is equal to I=I_0cos^2\Theta

So 0.775=0.970cos^2\Theta

cos^2\Theta =0.798

cos\Theta =0.893

\Theta =26.74^{\circ}

So the transmission axis of polarizing sheet makes an angle of \Theta =26.74^{\circ} with the horizontal

5 0
3 years ago
___________ is the gradual increase in the overall temperature of the earth’s atmosphere generally attributed to the greenhouse
victus00 [196]
Global Warming 

hope it helps you!
8 0
3 years ago
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How do solve for a in yf=yi+vi *t + 1/2*at^2. Also, What’s this formulas name
ddd [48]

Answer:

Kinematics

Explanation:

8 0
4 years ago
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