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ruslelena [56]
2 years ago
15

A piece of styrofoam has a charge of 0.002 mC and is placed 0.5 m from a grain of salt with a charge of 0.03 nC. How much electr

ostatic force is produced?
Physics
1 answer:
aleksklad [387]2 years ago
5 0

Answer:

2.16×10⁻⁶ N

Explanation:

Applying,

F = kqq'/r² (coulomb's Law)....................... Equation 1

Where F = electrostatic force, k = coulomb's constant, q = charge on the styrofoam, q' = charge on the grain of salt, r = distance between the charges.

From the question,

Given: q = 0.002 mC = 2.0×10⁻⁶ C, q' = 0.03 nC = 3.0×10⁻¹¹ C, r = 0.5 m

Constant: k = 8.99×10⁹ Nm²/C²

Substitute these values into equation 1

F = (2.0×10⁻⁶)(3.0×10⁻¹¹)(8.99×10⁹)/0.5²

F = 2.16×10⁻⁶ N

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Drop by a factor of 64

Explanation:

By Newtons law of gravity,

F=\frac{Gm₁m₂}{r^{2} } where;

G = Universal gravitaional constant

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m₁,m₂ = masses of thee objects.

F = Gravitational force.

m = \frac{4}{3}π r³ρ  (mass = volume into density.

So when radius is halved, mass drops by a factor of 8,

m' = \frac{4}{3}π (r/2)³ρ

     = \frac{1}{6}π r³ρ

So in substitution to the equation,

F'=\frac{G(m₁/8)(m₂/8)}{r^{2} }

F' = F/64

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There are many factors that influence the strength of an electromagnet. What could be done to make the electromagnet stronger?
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Wrapping the coil around a piece of iron
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At high noon, the sun delivers 1150 w to each square meter of a blacktop road. if the hot asphalt loses energy only by radiation
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Stephen`s Law:
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e = 1 for blacktop;
1150 W = (Sigma) · T^4
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3 years ago
A hovering mosquito is hit by a raindrop that is 50 times as massive and falling at 8.4 m/s, a typical raindrop speed. How fast
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The final velocity after the collision is 8.2 m/s

Explanation:

We can solve this problem by using the law of conservation of momentum: in fact, if we consider the system to be isolated (=no external unbalanced forces), the total momentum of the raindrop+mosquito must be conserved before and after the collision.

If the collision is perfectly inelastic, moreover, the raindrop and the mosquito stick together and travel at the same velocity v after the collision.

Mathematically:

p_i = p_f\\m_1 u_1 + m_2 u_2 = (m_1+m_2)v  

where:  

m_1 is the mass of the first mosquito

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u_2 = 8.4 m/s is the initial velocity of the raindrop

v is the final combined velocity of the raindrop+mosquito

Re-arranging the equation and substituting, we find:  

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Learn more about momentum here:

brainly.com/question/7973509  

brainly.com/question/6573742  

brainly.com/question/2370982  

brainly.com/question/9484203  

#LearnwithBrainly

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