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3 years ago

Explain why stationary waves are seen only certain frequencies (3 marks)

Physics

1 answer:

Anettt [7]3 years ago

4 0

Explanation:

The underlying physics give rise to periodic behavior. Usually, some resonance is involved, in which the media damps waves except those at a specific frequency.

Only waves at a specific frequency are recognized as being "stationary." If the frequency varies, the behavior is described as "chaotic." So, it's partly a matter of definition.

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A car has a speed of 23 m/s and a momentum of 31,050 kg·m/s. What is the mass of the car?

Ilya [14]

Answer:

Mass = 1350kg

Explanation:

Given the following data;

Velocity = 23m/s

Momentum = 31,050 kg·m/s.

To find the mass of car;

Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.

Mathematically, momentum is given by the formula;

Momentum = mass * velocity

Substituting into the equation, we have

31,050 = mass*23

Mass = 31,050/23

Mass = 1350kg

Therefore, the mass of the car is 1350 kilograms.

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3 years ago

A delivery truck travels with a constant velocity up an 8 slope. A 60 kg box sits on the floor of the truck and, because of sta

Blababa [14]

Explanation:

Given that,

The slope of the ramp, $\theta=8^{\circ}$

Mass of the box, m = 60 kg

(a) Distance covered by the truck up the slope, d = 300 m

Initially the truck moves with a constant velocity. We know that the net work done on the box is equal to 0 as per work energy theorem as :

$W=\dfrac{1}{2}m(v^2-u^2)=0$

u and v are the initial and the final velocity of the truck

(b) The work done on the box by the force of gravity is given by :

$W=Fd\ cos\theta$

Here, $\theta=90+8=98^{\circ}$

$W=mgd\ cos\theta$

$W=60\times 9.8\times 300\ cos(98)$

W = -24550.13 J

(c) What is the work done on the box by the normal force is equal to 0 as the angle between the force and the displacement is 90 degrees.

(d) The work done by friction is given by :

$W_f=-W$

$W_f=24550.13\ J$

Hence, this is the required solution.

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As a candle burns on the table, you can see the electromagnetic energy and feel the thermal energy released. Which two statement

elena-s [515]

Answer:

The answer is B

Explanation:

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4 years ago

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For an object at rest, the normal force equals the gravitational force. What is the sum of these forces called?

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The sum of all forces on an object is called the "net" force on it.

For an object at rest, we call that sum of forces "zero".

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Lisa [10]

Answer:

infrared part of the spectrum

Explanation:

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4 years ago

Explain why stationary waves are seen only certain frequencies (3 marks)​

Explain why stationary waves are seen only certain frequencies (3 marks)