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3 years ago

Which statement correctly describes magnetic field lines?

Physics

2 answers:

coldgirl [10]3 years ago

5 0

Answer:

They never cross

Explanation:

Dennis_Churaev [7]3 years ago

3 0

Answer:

A. They never cross

Explanation:

The magnetic field lines cannot be crossed, since this would mean that there would be more than one value for the magnetic field at the same point, that is, at the point where the lines intersect. Therefore, the resulting magnetic field vector at a point in space, where the field takes place, is unique.

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Un cuerpo de 480 g de masa es atraído con una fuerza de 3.9 E-6 N por otro cuerpo de 196 g de masa. Calcula la distancia a la qu

Soloha48 [4]

Answer:

La distancia entre los dos cuerpos es aproximadamente 1.269 milímetros.

Explanation:

Asumamos que ambos cuerpos son partículas, la fuerza de atracción ( $F$ ), en newtons, entre ambos cuerpos se define mediante la Ley de Newton de la Gravitación Universal, cuya ecuación es:

$F = G \cdot \frac{m_{1}\cdot m_{2}}{r^{2}}$ (1)

Donde:

$G$ - Constante de la gravitación universal, en metros cúbicos por kilogramo-segundo cuadrado.

$m_{1}, m_{2}$ - Masas de los cuerpos, en kilogramos.

$r$ - Distancia entre los cuerpos, en metros.

Si sabemos que $G = 6.674\times 10^{-11}\,\frac{m^{3}}{kg\cdot s^{2}}$ , $m_{1} = 0.48\,kg$ , $m_{2} = 0.196\,kg$ y $F = 3.9\times 10^{-6}\,N$ , entonces la distancia entre los dos cuerpos es:

$r = \sqrt{\frac{G\cdot m_{1}\cdot m_{2}}{F} }$

$r \approx 1.269\times 10^{-3}\,m$

Es decir, la distancia entre los dos cuerpos es aproximadamente 1.269 milímetros.

5 0

3 years ago

A potter's wheel has the shape of a solid uniform disk of mass 13.0 kg and radius 1.25 m. It spins about an axis perpendicular t

Fittoniya [83]

Answer: $10.82 kg-m^2$

Explanation:

Given

Mass of solid uniform disk $M=13 kg$

radius of disk $r=1.25 m$

mass of lump $m=1.7 kg$

distance of lump from axis $r_0=0.63$

Moment of inertia is the distribution of mass from the axis of rotation

Initial moment of inertia of disk $I_1=\frac{Mr^2}{2}$

$I_1=\frac{13\times 1.25^2}{2}=10.15 kg-m^2$

Final moment of inertia $I_f$ =Moment of inertia of disk+moment of inertia of lump about axis

$I_f=\frac{Mr^2}{2}+mr_0^2$

$I_f=10.15+1.7\times 0.63^2$

$I_f=10.15+0.674$

$I_f=10.82 kg-m^2$

3 0

4 years ago

On an aircraft carrier, a jet can be catapulted from 0 to 240

IRISSAK [1]

Answer:

m = 27752.7 [kg]

Explanation:

To solve this problem we must first use the following equation of kinematics.

$v_{f}=v_{o}+a*t$

where:

Vf = final velocity = 240 [km/h]

Vo = initial velocity = 0

a = acceleration [m/s²]

t = time = 2 [s]

But first we must convert the speed from kilometers per hour to meters per second.

$240[\frac{km}{h} ]*(\frac{1h}{3600s} )*(\frac{1000m}{1km} )=66.67[m/s]$

Now replacing:

$66.67 = 0 +a*2\\a = 33.33 [m/s^{2} ]$

Now using Newton's second law which is defined as the product of mass by acceleration we can determine the mass of the jet.

∑F = m*a

$925000=m*33.33\\m = 925000/33.33\\m = 27752.7 [kg]$

4 0

3 years ago

resistance is inversely proportional to cross sectional area; is it same as cross sectional area inversely proportional to resis

mart [117]

The greater the cross sectional area of the condoctor, the greater the number of electrons that move and contribute to the current. Having a larger current for the same voltage means having a larger conductance. Since resistance is the inverse of conductance, cross sectional area is inversely related to the resistance.

3 0

3 years ago

How do sex cells differ from other human cells?

VLD [36.1K]

Sex cells have half as many chromosomes as other cells. Sex cells are therefore called haploid.

7 0

4 years ago