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ehidna [41]
2 years ago
10

Microwaves and gamma rays

Physics
1 answer:
sertanlavr [38]2 years ago
6 0

Answer:

Have the same speed.

Explanation:

All electromagnetic waves travel at the same speed, which is 300,000,000 m/s.

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Na figura, um bloco de massa igual a 5Kg é abandonado em repouso em um plano inclinado. Supondo que os coeficientes de atrito es
Law Incorporation [45]

The figure mentioned on the question is in the attachment.

Answer: a) P_{x} = - 38.35N

b) F_{N} = 30.5 N

c) F_{f} = 27.45 N

d) a = - 13.16 m/s²

Explanation: A block on an inclined plane has 3 forces acting on it:

  • Force due to gravity F_{g} = m.g;
  • Normal Force due to the plane;
  • Force of Friction F_{f} = µ.N;

Since the plane is inclined, Normal Force is equal the y-component of the force due to gravity and Force of friction and the x-component of the force due to gravity are opposite forces.

The second attachment ilustrate the forces acting on the block.

Calculating:

A) The magnitude of the x-component of Force due to gravity:

According to the second image:

P_{x} = P.sinθ

P_{x} = 5.9.8.sin(36.8)

P_{x} = - 38.35 N

B) F_{N} = P_{y} = m.g.cosθ

F_{N} = 5.9.8.cos(36.8)

F_{N} = 30.5 N

C) F_{f} = 0.9.30.5

F_{f} = 27.45 N

D) For the acceleration, use Newton's Law: F_{R} = m . a

If there is movement, it is only on x-axis, so the net force is:

P_{x} - F_{f}  = m.a

- 38.35 - 27.45 = 5a

a = - 13.16 m/s²

The value of acceleration shows there is <u>no</u> <u>movement</u> on the x-axis due to the friction.

7 0
3 years ago
Fellow student of mathematical bent tells you that the wave function of a traveling wave on a thin rope is y(x,t)= 2.20 mm cos[(
bezimeni [28]

Answer

given,

y(x,t)= 2.20 mm cos[( 7.02 rad/m )x+( 743 rad/s )t]

length of the rope = 1.33 m

mass of the rope = 3.31 g

comparing the given equation from the general wave equation

y(x,t)= A cos[k x+ω t]

A is amplitude

now on comparing

a) Amplitude  = 2.20 mm

b) frequency =

     f = \dfrac{\omega}{2\pi}

     f = \dfrac{743}{2\pi}

          f = 118.25 Hz

c) wavelength

        k= \dfrac{2\pi}{\lambda}

        \lambda= \dfrac{2\pi}{k}

        \lambda= \dfrac{2\pi}{7.02}

        \lambda= 0.895\ m

d) speed

         v = \dfrac{\omega}{k}

         v = \dfrac{743}{7.02}

                v = 105.84 m/s

e) direction of the motion will be in negative x-direction

f) tension

  T = \dfrac{v^2\ m}{L}

  T = \dfrac{(105.84)^2\times 3.31 \times 10^{-3}}{1.33}

      T = 27.87 N

g) Power transmitted by the wave

  P = \dfrac{1}{2}m\ v \omega^2\ A^2

  P = \dfrac{1}{2}\times 0.00331\times 105.84\times 743^2\ 0.0022^2

      P = 0.438 W

5 0
3 years ago
Iron filings were mixed together with salt crystals. What unique property of iron would be BEST to separate the filings from the
Mashcka [7]
The melting point. So d is ur answer. The color and texture of both is the same. They sont have magnetism. So the only logical one is melting point.

Please vote brainliest
6 0
3 years ago
Read 2 more answers
The ratio of the number of pigs to the number of horse in a farm is 2 to 3 (2:3), if therected are 24 horses, what is the number
pickupchik [31]

Answer:

16 pigs

Explanation:

Let the horses be H.

Let the pigs be P

Let the total number of animals be x.

Given the following data;

Ratio of P to H = 2:3 = 2 + 3 = 5

Number of horses = 24

To find the number of pigs;

First of all, we would determine the total number of animals x.

From the ratio of horse, H:

3/5 * x = 24

Cross-multiplying, we have;

3x = 120

x = 120/3 = 40

Next, we find the number of pigs;

Pigs = 2/5 * 40

Pigs = 80/5 = 16 pigs

5 0
3 years ago
Which one of the following is a correct statement......
IceJOKER [234]

Answer:

Just 3

Explanation:

I believe the other two are incorrect

5 0
3 years ago
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