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vredina [299]
3 years ago
8

A vector that is 1 cm long represents a displacement of 21 km. How many kilometers are represented by a 3-cm vector drawn to the

same scale?
Physics
1 answer:
koban [17]3 years ago
5 0

The 3 cm vector represents 63 km.

Since a 1 cm long vector represents a displacement of 21 km, we need to find the number of kilometers a 3 cm vector represents.

Let x represent the displacement the 3 cm vector represents.

By ratio, we have 1 cm: 21 km = 3 cm : x

So, 1 cm/21 km = 3 cm/x

Cross-multiplying, we have

x × 1 cm = 3 cm × 21 km

x = 3 cm × 21 km/1 cm

x = 63 km

So, the 3 cm vector represents a displacement of 63 km.

Learn more about displacement here:

brainly.com/question/17673000

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Two stones resembling diamonds are suspected of being fakes. To determine if the stones might be real, the mass and volume of ea
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Answer:

stone A is diamond.

Explanation:

given,

Volume of the two stone =  0.15 cm³

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Mass of stone B = 0.42 g

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So, to find which stone is gold we have to calculate the density of both the stone.

We know,

density\density = \dfrac{mass}{volume}

density of stone A

\rho_A = \dfrac{0.52}{0.15}

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density of stone B.

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Whats 46/50 as a percent?​
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6 0
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in the diagram, q2 is +34.4*10^-6 C, and q3 is -72.8*10^-6 C. The net force on q2 is 225 N to the right. What is q1? Include the
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Answer:

  q₁ = -6.54 10⁻⁵ C

Explanation:

Force is a vector quantity, but since all charges are on the x-axis, we can work in one dimension, let's apply Newton's second law

                F = F₁₂ + F₂₃

the electric force is given by Coulomb's law

                F = k q₁q₂ / r₁₂²

let's write the expression for each force

                F₂₃ = k q₂ q₃ / r₂₃²

                F₂₃ = 9 10⁹ 34.4 10⁻⁶ 72.8 10⁻⁶ / 0.1²

                F₂₃ = 2.25 10³ N

               

                F₁₂ = k q₁q₂ / r₁₂²

                F₁₂ = 9 10⁹ q₁ 34.4 10⁻⁶ / 0.1²

                F₁₂ = q₁   3,096 10⁷ N

we substitute in the first equation

                225 = q₁  3,096 10⁷ +2.25 10³

                q₁ = (225 - 2.25 10³) / 3,096 10⁷

                q₁ = -6.54 10⁻⁵ C

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3 years ago
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