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3 years ago

Which statement correctly distinguishes between mechanical and electromagnetic waves?

Physics

2 answers:

Kruka [31]3 years ago

8 0

Answer:

The answer is B) Mechanical waves carry energy through matter; electromagnetic waves carry energy through space.

mezya [45]3 years ago

7 0

The statement that correctly distinguishes between mechanical and electromagnetic waves is: "<span>Mechanical waves carry energy through matter; electromagnetic waves carry energy through space.</span>" Mechanical waves need a medium to propagate, therefore they can only carry energy through matter. Electromagnetic is not limited by vacuum, therefore they can carry energy through space.

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A 260-kg glider is being pulled by a 1,940-kg jet along a horizontal runway with an acceleration of a= 2.20 m/s^2 to the right.

lisov135 [29]

Answer:

a) The magnitude of the thrust provided by the jet's engines is 4840 newtons.

b) The magnitude of the tension in the cable connecting the jet and glider is 572 newtons.

Explanation:

a) By Newton's laws we construct the following equations of equilibrium. Please notice that both the glider and the jet experiments has the same acceleration:

Jet

$\Sigma F = F - T = m_{J}\cdot a$ (1)

Glider

$\Sigma F = T = m_{G}\cdot a$ (2)

Where:

$F$ - Thrust of jet engines, measured in newtons.

$T$ - Tension in the cable connecting the jet and glider, measured in newtons.

$m_{G}$ , $m_{J}$ - Masses of the glider and the jet, measured in kilograms.

$a$ - Acceleration of the glider-jet system, measured in meters per square second.

If we know that $m_{G} = 260\,kg$ , $m_{J} = 1,940\,kg$ and $a = 2.20\,\frac{m}{s^{2}}$ , then the solution of this system of equations:

By (2):

$T = (260\,kg)\cdot \left(2.20\,\frac{m}{s^{2}} \right)$

$T = 572\,N$

By (1):

$F = T+m_{J}\cdot a$

$F = 572\,N+(1,940\,kg)\cdot \left(2.20\,\frac{m}{s^{2}} \right)$

$F = 4840\,N$

The magnitude of the thrust provided by the jet's engines is 4840 newtons.

b) The magnitude of the tension in the cable connecting the jet and glider is 572 newtons.

7 0

3 years ago

The wave shown below is produced in a rope.

Kay [80]

Answer:

<h3>B) A dot vector drawn up and vector drawn down.</h3>

Explanation:

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6 0

3 years ago

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According to kinetic theory, which two factors are important for a successful reaction to occur?

fgiga [73]

Answer:

Molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. Molecules must collide with the proper orientation.

Explanation:

A collision that meets these two criteria, and that results in a chemical reaction, is known as a successful collision or an effective collision.

6 0

2 years ago

Calculate the minimum wavelength (λ0) for the continuous spectrum of X-rays emitted when.. a) 30-kV electrons strike a cobalt (C

Sholpan [36]

Explanation:

The relationship between the wavelength and the potential difference V is given by :

$\lambda=\dfrac{h}{\sqrt{2me}}\times \dfrac{1}{\sqrt{V}}$