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4 years ago

Please help. This is for my physics class, high school level!

Physics

1 answer:

kakasveta [241]4 years ago

3 0

So if the car travels 60 meters per second, and the car travels for 60 seconds, then the answer will be 60 meters times 60 seconds, so the car traveled a total of 3600 meters.

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

gladu [14]

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 m is the mass and v 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 1000 Joules

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3 years ago

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Which is defined as a disturbance in matter that carries energy from one place to another?

Furkat [3]

an acoustic wave carries energy

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Your outlets at home are rated at 120 V, i.e. the two prongs have on average a potential difference of 120V. If you transfer 2.7

hodyreva [135]

Answer:

E =230.4 MJ

Explanation:

As 1 mole of electron = 6X 10^23 particles.

charge of an electron is 1.6 X 10 ^-19 C

Finding Charge:

(6X10^23 ) (2.7)(1.6X10^-19 C)

i.e. 192 K C

now to find the energy released from electrons

V=E/q

E=V X q

i.e E = 120 V X 192 K C

E =230.4 MJ

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Kazeer [188]

Answer:

Explanation:

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thus, teammates work together, win and lose together, and often eat and live together.

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chubhunter [2.5K]

Answer:b

Explanation:

thats what my teacher said

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