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3 years ago

Need help with this question!! NO LINKS plzwill give 5 stars and brainliest

Physics

2 answers:

Ilia_Sergeevich [38]3 years ago

8 0

I believe its the one marked. scalar, magnitude alone.

Vlad [161]3 years ago

3 0

Answer: Your answer is right its A

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A 0.260 m radius, 525 turn coil is rotated one-fourth of a revolution in 4.17 ms, originally having its plane perpendicular to a

Sophie [7]

Answer:

B = 0.37T

Explanation:

In order to calculate the needed magnitude of the magnetic force you use the following formula, which calculate the induced emf of the solenoid when there is a change in the magnetic flux:

$emf=-N\frac{\Delta \Phi_B}{\Delta t}=-N\frac{\Delta (BAcos\theta)}{\Delta t}$ (1)

emf: induced voltage in the solenoid = 10,000V

N: turns of the solenoid = 525

ФB: magnetic flux

B: magnitude of the magnetic field = ?

A: cross-sectional area of the solenoid = π*r^2

r: radius of the cross-sectional area = 0.260m

Δt: interval time of the change of the magnetic flux = 4.17ms = 4.17*10^-3s

First, you have the magnetic field direction perpendicular to the plane of the solenoid, after, the angle between them is 90° (quarter of a revolution)

In the equation (1) the only parameter that changes on time is the angle, then, you can solve for B from the equation (1):

$emf=-NBA\frac{cos(90\°)-cos(0\°)}{\Delta t}=\frac{NBA}{\Delta t}\\\\B=\frac{(\Delta t)(emf)}{NA}=\frac{(\Delta t)(emf)}{N(\pi r^2)}\\\\$

Finally, you replace the values of the parameters to calculate B:

$B=\frac{(4.17*10^{-3}s)(10000V)}{(525)(\pi(0.260m)^2)}=0.37T$

The strength of the magnetic field is 0.37T

7 0

3 years ago

Process of Science Task: Earth-Centered vs. Sun-Centered Models.

Gnoma [55]

Answer:

There are a number of models as explained below.

Explanation:

Depending on the position of the earth in the orbit, stars will be in different positions relative to the distant stars.

This model can be explained by the parallax effect. An object is viewed differently by the left and the right eye.

Reference can be made to the geocentric and heliocentric arguments. The first view argues that heavens are composed of 55 concentric spheres.

On the other hand, the heliocentric system, proposed by Copernicus, suggested that the Sun, not the earth, was the center of the solar system.

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3 years ago

Explain why a crack in glass looks brighter than the rest of the glass

m_a_m_a [10]

Answer:

Because nothing is blocking the LIGHT!

Explanation:

Light may still be shining on the whole glass but if it wasn't there light would shine brighter than if it was there.

8 0

3 years ago

Two pickup trucks each have a mass of 2,000 kg. The gravitational force between the trucks is 3.00 × 10-5 N. One pickup truck is

levacccp [35]

Answer:

New gravitational force would be: $4.5\,\,\,10^{-5}\,\,\,N$

Explanation:

Recall the general form of the gravitational force between two objects of masses m1 and m2 separated a distance "d":

$F_g=G\,\frac{m1\,*\, m2}{d^2}$

which for the 2000 kg trucks becomes:

$F_g=G\,\frac{m1\,*\, m2}{d^2} \\3\,\,\,10^{-5}\,N=G\,\frac{2000\,*\, 2000}{d^2}$

when we add 1000 kg of bricks to one truck, we get the following unknown force (x) that we need to find:

$F_g=G\,\frac{m1\,*\, m2}{d^2} \\x=G\,\frac{3000\,*\, 2000}{d^2}$

Now we divide term by term the last equation by the previous one, in order to cancel out common factors to both equation (G, d^2) and get the following equation:

$\frac{x}{3\,\,\,10^{-5}} =\frac{3000}{2000} \\x=\frac{9}{2} \,10^{-5} =4.5\,\,\,10^{-5}\,\,\,N$