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4 years ago

Example of natural frequency

1 answer:

7 0

Natural frequency is a frequency when an object hits a s surface and causes ripples or vibrations or disturbance of their nearby source. An example is throwing a stone to water. When you throw a stone, it creates a wave around the fallen stone. The water is being disturbed by the stone and creates a wave. This is a natural frequency.

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A truck goes 5 m/s to 25 in 20 seconds. What is the acceleration of the truck during 20-seconds interval?

Aliun [14]

Acceleration = (change in speed) / (time for the change)

Change in speed = (ending speed) - (starting speed)

Change in speed = (25 m/s) - (5 m/s) = 20 m/s

Time for the change = 20 sec

Acceleration = (20 m/s) / (20 sec)

<em>Acceleration = 1 m/s²</em>

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3 years ago

3. True or false: Evaporation is the change of state from a gas to a liquid. *

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Answer:

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3 years ago

A 2 kg object with 100 J potential energy (with respect to the ground) is released from rest from the top of a building, the spe

ioda

velocity of object just before hitting the ground = 10 m/s

10 m/sExplanation:

here's the solution : -

=》mechanical energy is always constant, when the object is at the top of the building , the object has potential energy but no kinetic energy,

so, at the top of the building the mechanical energy = potential energy = 100 J

but at when it is dropped from the building, the whole potential energy get converted into kinetic energy, just before reaching the bottom .

so, mechanical energy in the object just before hitting the ground = kinetic energy

( potential energy = 0 )

So, kinetic energy = 100 J

now, we know

$kinetic \: energy = \frac{1}{2} \times m {v}^{2}$

=》

$100 = \frac{1}{2} \times 2 \times {v}^{2}$

( since, mass = 2 kg )

=》

$100 = {v}^{2}$

=》

$v = \sqrt{100}$

=》

$v = 10$

so, velocity of object just before hitting the ground = 10 m/s

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3 years ago

Which of the following statements is true about isotopes? Question options: The number of protons always equals the number of ne

arlik [135]

The number of protons always equals the number of neutrons in all isotopes: false

Different isotopes for the same element always have the same number of protons: True

The number of protons never equals the number of neutrons in an isotope: False (example: He)

Different isotopes for the same element will always have the same numbers of neutrons: false

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4 years ago

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