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ValentinkaMS [17]
4 years ago
9

What an object at rest stays at rest and an object in motion with the same speed and in the same direction unless acted upon by

an unbalanced force is newton's 1st law of motion?
True
Or
False
Physics
2 answers:
GalinKa [24]4 years ago
7 0

Answer:

True.

Explanation:

Newton's First Law of Motion states that every object continues in it's state of rest or of uniform motion in a straight line unless acted upon by an external force.

NemiM [27]4 years ago
6 0
The newt stays at rest and is an object in motion
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Three equal 1.55-μC point charges are placed at the corners of an equilateral triangle whose sides are 0.500 m long. What is the
kati45 [8]

Answer:

0.12959085 J

Explanation:

k = Coulomb constant = 8.99\times 10^{9}\ Nm^2/C^2

q = Charge = 1.55 μC

d = Distance between charge = 0.5 m

Electric potential energy is given by

U=k\dfrac{q^2}{d}

In this system with three charges which are equidistant from each other

U=k\dfrac{q^2}{d}+k\dfrac{q^2}{d}+k\dfrac{q^2}{d}

\\\Rightarrow U=k\dfrac{3q^2}{d}\\\Rightarrow U=8.99\times 10^9\times \dfrac{3\times (1.55\times 10^{-6})^2}{0.5}\\\Rightarrow U=0.12959085\ J

The potential energy of the system is 0.12959085 J

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3 years ago
A cylindrical conductor with a circular cross section has a radius a and a resistivity p and carries a constant current I. (Take
Lady bird [3.3K]

Answer:

Explanation:

a)

Using Ohms Law

R= \rho \frac{l}{\pi a^2 }
\\V = IR = E l = I \rho \frac{l}{\pi a^2 }
\\E = \frac{I \rho}{\pi a^2 }
\\E = J \rho


Where J is the current density J = \frac{I}{\pi a^2 }


and the direction of E is the same as the direction of the current. Since J is uniform throughout the conductor E = \rhoJ just inside at a radius a (and anywhere else).

b)

Since we have no changing electric fields we can use Ampere’s law in it’s simplest form without displacement current

\oint B .dl = B 2 \pi a = \mu_{o} I


such that

B = \frac{\mu_{o} I}{2 \pi a }


and by the right hand rule, since the current is going to the right, the magnetic field is circling around the conductor such that it’s pointing out of the page at the top and into the page at the bottom.

c)

The Poynting vector is given by

S = \frac{1}{ \mu_o} |E \textrm{x}B| = \frac{\rho I^2}{2 \pi^2 a^3}


and by the right hand rule it’s always pointing in towards the center of the conductor.

d)

Note: directions of these three vectors are mentioned along with their magnitudes in above 3 parts a , b and c

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3 years ago
ANSWER QUICK 30 POINTS
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Answer:

Gravity controls the movement of the planets around the sun, holds together stars grouped in galaxies, and galaxies grouped in clusters.  The Universal Law of Gravitation depends on two things.  First it depends on mass of each object  and the second factor is the distance between two objects.  If the mass of one object is Larger, the gravitational pull towards it will be larger  and the smaller distance, the larger the gravitational pull will be between the objects. Therefore the Larger planets have more moon and the inner planets have less.

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