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schepotkina [342]
3 years ago
12

A train has a mass of 1.50 x 107 kg. If the engine can

Physics
1 answer:
Vikki [24]3 years ago
8 0

vi=0, vf=80km/hr=22m/s, m=1.5x107kg, F = 7.5x105N.

a=F/m, t=(vf-vi)/a= (vf-vi)m/F = (22m/s)(1.5x107kg)/7.5x105N = 440 kg m/sN =  440 s or 7mins

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Water falls off a cliff of height 20m at a rate of 50kg per second
docker41 [41]

Answer:

M = 50 kg / sec * 60 sec = 3000 kg       water that falls

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PE = 3000 kg * 9.8 m/s^2 * 20 m = 588,000 joules of energy lost

5 0
1 year ago
As the frequency of the ac voltage across a capacitor approaches zero, the capacitive reactance of that capacitor:_______.
Akimi4 [234]

Answer:

b. approaches infinity

Explanation:

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​

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3 years ago
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lesantik [10]

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8 0
1 year ago
5.<br> When your brakes fail, you should<br> The answer is B
miskamm [114]

Answer:

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Explanation:

6 0
3 years ago
You have a 35X objective lens in place, and the numerical aperture of the objective lens is 0.75. The numerical aperture of the
olasank [31]

Answer:

350x

Explanation:

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Total magnification is 350x

8 0
3 years ago
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