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konstantin123 [22]
3 years ago
11

The owners want the speed at the bottom of the first hill doubled. How much higher must the first hill be built?

Physics
1 answer:
Sonja [21]3 years ago
3 0
Neglecting friction and air resistance, the first hill must be built 4 times higher than it is now.
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A low-pass first-order instrument has a time constant of 20 ms. find the frequency, in hertz, of the input at which the output w
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The sound source of a ship’s sonar system operates at a frequency of 22.0 kHz . The speed of sound in water (assumed to be at a
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Answer:

147.456077993 Hz

Explanation:

f_0 = Frequency of the sonar = 22 kHz

v_w = Velocity of the whale = 4.95 m/s

v = Speed of sound in water = 1482 m/s

The difference in frequency is given by

\Delta f=f_0\times\dfrac{2v_{w}}{v-v_w}\\\Rightarrow \Delta f=22000\times\dfrac{2\times 4.95}{1482-4.95}\\\Rightarrow \Delta f=147.456077993\ Hz

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What evidence supports the theory that there is a black hole at the center of our galaxy?
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Explanation:

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A student who runs every day is becoming bored with her physical fitness routine and considers quitting. What is the most effect
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Explained

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A student who runs every day is becoming bored with her physical fitness routine and considers quitting. Now in order maintain her fitness routine she needs to break the monotony by changing her exercise regime. She do other activities like play sports two days a week, she do aerobics, she even try some cardio vascular exercises which as good as running. She also try changing her route of running as the new view might inspire her.

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Answer:

1 - third law

2 - second law

3 - first law

4 - third law

5 - second law

6 - first law

Explanation:

First law

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Second law

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F = ma.

Third law

When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.

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