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Nady [450]
3 years ago
13

What are the steps of scientific inquiry

Physics
1 answer:
lutik1710 [3]3 years ago
7 0
<span>.Ask a Question
.Do Background Research.
.Construct a Hypothesis.
.Test Your Hypothesis by Doing an Experiment
.Analyze Your Data and Draw a Conclusion.
<span>.Communicate Your Results.</span></span>
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Maybe The 3rd One Not Sure!
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Which of the following statements correctly describes the role that friction plays in the motion of a train? *
Lesechka [4]

Answer:

Should be D!

Explanation:

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The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.56 m and 1.00 m, respectively. The respective
valentina_108 [34]

Answer:

Explanation:

Given

Diameter of main rotor d_1=7.56 m

Tail rotor d_2=1 m

N_1=453 rev/min

N_2=4137 rev/min

\omega =\frac{2\pi N}{60}

\omega _1=\frac{2\pi 453}{60}=47.44 rad/s

\omega _2=\frac{2\pi 4137}{60}=433.28 rad/s

Speed of the tip of main rotor=\omega _1\times r_1=47.44\times \frac{7.56}{2}=179.32 m/s

Speed of tail rotor=\omega _2\times r_2=433.28\times \frac{1}{2}=216.64 m/s

7 0
3 years ago
GRAVITY IS DEPENDENT UPON *
Rashid [163]

Answer:

C......................

5 0
3 years ago
(b) The efficiency of the pump which operates the fountain is 70%.
ruslelena [56]

Answer:

Power supplied to the pump is 980000 W or 980 KW

<em>Note: The question is incomplete. The complete question is given below:</em>

<em>On a day with no wind, a fountain in Switzerland propels 30000 kg of water per minute to a height of 140 metres. </em>

<em>a)Calculate the power used in raising the water? </em>

<em>b)The efficiency of the pump which operates the fountain is 70% </em>

<em>calculate the power supplied to the pump?</em>

Explanation:

Efficiency = Power output/Power input * 100%

Power output = work done/ time

where work done = mass * acceleration due to gravity (g) * height

time = 1 minute = 60 seconds

mass of water = 30000 kg, height = 140 meters, g = 9.8 m/s²

Then, work done = 30000 * 140 * 9.8 = 41160000 J

Power output then = 41160000 J / 60 s

Power output = 686000 W

The power input can then be derived from the formula of efficiency

Power input = (Power output * 100)/Efficiency

Power input = (100 * 686000) / 70

Power input = 980000 W

Therefore, power supplied to the pump is 980000 W or 980 KW

8 0
3 years ago
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