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VashaNatasha [74]
2 years ago
10

How is an emission spectrum of an element generated?

Physics
1 answer:
zzz [600]2 years ago
4 0
I don’t know the answer hope you find them I’m desperate for points that’s why I’m doing this
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What is the kinetic energy of a bike with a mass of 16 kg traveling at 4m/s
sergey [27]

Explanation:

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3 years ago
What is the angle θ between vectors A⃗ and B⃗ if A⃗ =4ı^−4ȷ^ and B⃗ =−5ı^+7ȷ^?
ololo11 [35]

The characteristics of the scalar product allows to find the angle between the two vectors is:

  • The angle θ = 170º

The scalar product is the product between two vectors whose result is a scalar.

            A . B = |A|  |B| cos θ

Where A and B are the vectors, |A| and |B| are the modules of the vectors and θ at the angle between them.

The vector is given in Cartesian coordinates and the unit vectors in these coordinates are perpendicular.

            i.i = j.j = 1

            i.j = 0

            A . B = (4 i - 4j). * -5 i + 7j)

            A . B = - 4 5 - 4 7

            A. B = -48

We look for the modulus of each vector.

           |A| = \sqrt{x^2 +y^2 }

           |A| = \sqrt{4^2 + 4^2}  

           |A| = 4 √2

          |B| = \sqrt{5^2 +7^2}

          |B| = 8.60

We substitute.

            -48 = 4√2  8.60  cos θ

            -48 = 48.66 cos θ

            θ = cos⁻¹   \frac{-48}{48.664}  

            θ = 170º

In conclusion using the dot product we can find the angle between the two vectors is:

  • the angle θ = 170º

Learn more about the scalar product here:  brainly.com/question/1550649

8 0
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If ball 1 has a higher speed than ball 2, then ball 1 has higher kinetic energy than ball 2, since kinetic energy is the energy of movement.
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A 56-N net force acting on a cart accelerates it at a rate of 0.5 m/s/s. What is the mass of the cart
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F = m × a = 50 kg × 0.8 m/s2 = 40 kg • m/s2, or 40 N

Explanation:

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What will most likely happen if a sound wave moves from the air through a solid?
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What will most likely happen if a sound wave moves from the air through a solid? It will increase in wavelength. It will decrease in speed. ... It will decrease in wavelength.

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