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2 years ago

A) Khi nào một vật được coi là chuyển động ? Cho ví dụ ?

Physics

1 answer:

Lady bird [3.3K]2 years ago

3 0

Answer: ) Khi nào một vật được coi là chuyển động ? Cho ví dụ ?

b) Khi nào một vật coi là đứng yên? Cho ví dụ ?

c) Theo em câu phát biểu “ Khi khoảng cách từ vật đến vật mốc không thay đổi theo thời gian thì vật đứng yên so với vật mốc”. Có luôn đúng không, vì sao?

Explanation:

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Answer:

0.66c

Explanation:

Use length contraction equation:

L = L₀ √(1 − (v²/c²))

where L is the contracted length,

L₀ is the length at 0 velocity,

v is the velocity,

and c is the speed of light.

900 = 1200 √(1 − (v²/c²))

3/4 = √(1 − (v²/c²))

9/16 = 1 − (v²/c²)

v²/c² = 7/16

v = ¼√7 c

v ≈ 0.66 c

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2 years ago

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3 years ago

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Answer:

not captured for use by living things

Explanation:

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2 years ago

A 10 kg bear is running to the right at 10 m/s. He crashes into another 10 kg bear running to the left at -5 m/s. They collide a

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Answer:

<em>Total momentum is conserved</em>

Explanation:

<u>Conservation of Momentum </u>

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We have assumed both bears move to the right after the collision. In this situation, the total momentum is conserved

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D. Because the moons shadow during a total lunar eclipse is tinnier than the earth.

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2 years ago

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