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3 years ago

Write SHORT examples of Gravitational potential energy and Elastic energy

Physics

2 answers:

Nikolay [14]3 years ago

6 0

Dropping a bouncy ball and stretching a rubber ban.

gulaghasi [49]3 years ago

3 0

Answer:

Examples of a gravitational potential energy are; a flying helicopter, objects thrown up and examples of elastic energy are; an archers stretched bow, a stretched rubber band

Explanation:

We will start by giving a short definition of the two terminologies

Gravitational potential energy is the energy an object possess as a result of its position above the surface of the earth.

$E_{P}$ = mgh

where m = mass g = gravitational field strength h= height and $E_{P}$ =gravitational potential energy

Examples are; a flying helicopter, objects thrown up

Elastic energy: This occurs as a result of stretching, compressing or deforming of an object impermanently.

$E_{e}$ = $\frac{1}{2}$ ke²

where k = spring constant e=extension and $E_{e}$ =Elastic potential energy

examples of elastic energy are; an archers stretched bow, a stretched rubber band

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The resultant vector is 5.2 cm at a direction of 12⁰ west of north.

<h3>Resultant of the two vectors</h3>

The resultant of the two vectors is calculated as follows;

R = a² + b² - 2ab cos(θ)

where;

θ is the angle between the two vectors = 45° + (90 - 57) = 78⁰
a is the first vector
b is the second vector

R² = (3.7)² + (4.5)² - (2 x 3.7 x 4.5) cos(78)

R² = 27.02

R = 5.2 cm

<h3>Direction of the vector</h3>

θ = 90 - 78⁰

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3 years ago

A hiker walks 20.51 m at 33.16 degrees. What is the Y component of his displacement?

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Answer:

<em>The y component of his displacement is 11.22 meters</em>

Explanation:

<u>Components of the displacement</u>

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$x=r\cos\theta$

The vertical component is calculated by:

$y=r\sin\theta$

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$y=20.51\sin(33.16^\circ)$

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3 years ago

The speed of sound through air is approximately 340 m/sec. What is the wavelength of a sound wave with a frequency of 706 Hz? Ro

cestrela7 [59]

Answer:

Wavelength = 0.48 m (Approx)

Explanation:

Given:

Speed of sound = 340 m/s

Frequency = 706 hz

Find:

Wavelength

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Wavelength = Speed of sound / Frequency

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