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iragen [17]
2 years ago
14

Một ô tô chuyển động từ A đến B với tốc độ 30m/s rồi lập tức quay lại A với tốc độ 20m/s. Tính tốc độ trung bình trên cả đoạn đi

và về
Physics
1 answer:
viktelen [127]2 years ago
4 0
54 plus 95 is the real answer 3 is everyone’s lucky number one lucky leprechaun is the kind and two daughters are his wives
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Answer:

11.8 m/s

Explanation:

At the top of the hill, there are two forces on the car: weight force pulling down (towards the center of the circle), and normal force pushing up (away from the center of the circle).

Sum of forces in the centripetal direction:

∑F = ma

mg − N = m v²/r

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2 years ago
Which of these diagrams best represents the steps in the formation of planets?
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3 years ago
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A beam of electrons is accelerated from rest through a potential difference of 0.400 kV and then passes through a thin slit. Whe
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Answer:

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People have proposed driving motors with the earth's magnetic field. This is possible in principle, but the small field means th
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B = Magnetic field of Earth = 5\times 10^{-5}\ T

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Current is given by

I=\dfrac{\tau}{BA}\\\Rightarrow I=\dfrac{1\times 10^{-3}}{5\times 10^{-5}\times \dfrac{\pi}{4}\times 0.2^2}\\\Rightarrow I=636.619772368\ A

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3 years ago
what is the energy of an electromagnetic wave that has a frequency of 8.0 x 10^15 Hz? Use the equation...
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(C)

Explanation:

E = hf = (6.626×10^{-34}\:\text{J•s})(8.0×10^{15}\:\text{Hz})

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