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polet [3.4K]
3 years ago
11

A toy plane with a mass of 20 kg is flying at 10 m/s. What is its kinetic energy?

Physics
2 answers:
egoroff_w [7]3 years ago
6 0
A

On edg. ‘1,000 j’ hope it helps !:)
gladu [14]3 years ago
4 0

Answer:

\boxed {\boxed {\sf A. \ 1000 \ Joules}}

Explanation:

Kinetic energy can be found using the following formula.

E_k=\frac{1}{2}mv^2

where <em>m</em> is the mass and <em>v</em> is the velocity.

The mass of the toy plane is 20 kilograms and the velocity is 10 meters per second.

m= 20 \ kg \\v= 10 \ m/s  \\

Substitute the values into the formula.

E_k=\frac{1}{2}(20 \ kg) (10 \ m/s)^2

Solve the exponent first.

  • (10 m/s)²= 10 m/s *10 m/s= 100 m²/s²

E_k=\frac{1}{2} (20 \ kg) (100 \ m^2/s^2)

Multiply the last two numbers together.

E_k= \frac{1}{2}(2000 \ kg*m^2/s^2)

Multiply by 1/2 or divide by 2.

E_k= 1000 \ kg*m^2/s^2

  • 1 kilogram square meter per square second is equal to 1 Joule.
  • Our answer of 1000 kg*m²/s² is equal to 1000 Joules

E_k= 1000 \ J

The kinetic energy of the toy plane is <u>1000 Joules</u>

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Find the west component of 45 m 19º S of W
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Answer:

The west component of the given vector is - 42.548 meters.

Explanation:

We need to translate the sentence into a vectoral expression in rectangular form, which is defined as:

(x, y) = (r_{x}, r_{y})

Where:

r_{x} - Horizontal component of vector distance, measured in meters.

r_{y} - Vertical component of vector distance, measured in meters.

Let suppose that east and north have positive signs, then we get the following expression:

(x, y) = (-45\cdot \cos 19^{\circ}, -45\cdot \sin 19^{\circ})\,[m]

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The west component corresponds to the first component of the ordered pair. That is to say:

x = -42.548\,m

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Precipitation tends to be _______ on the _______ side of a mountain because water vapor _______ as it rises there.
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Answer:

Higher, Windward side, Condenses

Explanation:

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\frac{V_{s} }{V_{p} } = \frac{N_{s} }{N_{p} }

where: V_{s} is the voltage in the secondary coil, V_{p} is the voltage in the primary coil, N_{s} is the number of turns in the secondary coil and N_{p} is the number of turns in the primary coil.

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7 0
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