3 years ago

Which statement is true?

Physics

1 answer:

ser-zykov [4K]3 years ago

8 0

D is definitely the correct choice here.

I think a case could also be made for choice-B, but that would be a tough, complex operation.

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Determine the kinetic energy of a 2000 kg roller coaster car that is moving at the speed of 10 ms

kondaur [170]

Answer:

$\boxed {\boxed {\sf 100,000 \ Joules}}$

Explanation:

Kinetic energy is energy due to motion. The formula is half the product of mass and velocity squared.

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

The mass of the roller coaster car is 2000 kilograms and the car is moving 10 meters per second.

m= 2000 kg
s= 10 m/s

Substitute these values into the formula.

$E_k= \frac{1}{2} (2000 \ kg ) \times (10 \ m/s)^2$

Solve the exponent.

(10 m/s)²= 10 m/s * 10 m/s= 100 m²/s²

$E_k= \frac{1}{2} (2000 \ kg ) \times (100 \ m^2/s^2)$

Multiply the first two numbers together.

$E_k= 1000 \ kg \times (100 \ m^2/s^2)$

Multiply again.

$E_k= 100,000 \ kg*m^2/s^2$

1 kilogram square meter per square second is equal to 1 Joule.
Our answer of 100,000 kg*m²/s² is equal to 100,000 Joules.

$E_k= 100,000 \ J$

The roller coaster car has <u>100,000 Joules</u> of kinetic energy.

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Inertia is responsible for :

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B. the reason we must wear seat belts

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a ladybug sits at the outer edge of a merry-go-round and a gentleman bug sits halfway between her and the axis of rotation. The

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The gentleman bug's angular speed is the same as the ladybug's (1 rev/s)

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The unusually bright centers found in some galaxies are called ______.

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<span>Active Galactic Nuclei.</span>

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Can someone help me?

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24- series
25- parallel
26- no, because they’re connected in series
27- yes, because they’re connected in parallel

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