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Ilia_Sergeevich [38]
4 years ago
5

Which statement best describes how scientists and engineers work together in the research and development cycle? A. Scientists t

est designs made by engineers and then use the results to improve the designs. B. Scientists develop a new technology, and then engineers test it by doing experiments. C. Engineers come up with scientific questions when they are developing their design, and scientists do research to answer them. O D. Engineers make a scientific discovery, and then scientists perform research to verify it. please help asap if you can​
Physics
2 answers:
Pavlova-9 [17]4 years ago
7 0

Answer:

c

Explanation:

kiruha [24]4 years ago
5 0

C. Engineers come up  with  scientific questions when they are developing their design, and scientists do research to answer them

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Which statement best explains the movement of electric current from the clouds to the ground during a lightning storm? .
olga2289 [7]
"The <span>ground is positively charged and the clouds are negatively charged " is the statement among the statements given in the question that </span><span>best explains the movement of electric current from the clouds to the ground during a lightning storm. The correct option among all the options that are given in the question is the third option or option "C". </span>
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3 years ago
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When a ball rolls downhill, the rolling motion results in the ball ____________.
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I am pretty sure it is A Becoming warm

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In order to identify them, animal fossils and other fossils nearby can be: A. compared B. piled C. seen
tigry1 [53]

Answer:

A.compared

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Which of the
kompoz [17]
C. Amount of oxygen

The others either change but don’t decrease or they increase.
8 0
3 years ago
A silver wire has a cross sectional area a = 2.0 mm2. a total of 9.4 × 1018 electrons pass through the wire in 3.0 s. the conduc
marta [7]
This problem uses the relationships among current I, current density J, and drift speed vd. We are given the total of electrons that pass through the wire in t = 3s and the area A, so we use the following equation to to find vd, from J and the known electron density n, so: 

v_{d} =  \frac{J}{n\left | q \right |}

<span>The current I is any motion of charge from one region to another, so this is given by:

</span>I = \frac{\Delta Q}{\Delta t} = \frac{9.4x1018electrons}{3s} = 3189.73(A)

The magnitude of the current density is:

J = \frac{I}{A} = \frac{3189.73}{2x10^{-6}} = 1594.86(A/m^{2})

Being:

A=2mm^{2} = 2x10^{-6}m^{2}
<span>
Finally, for the drift velocity magnitude vd, we find:

</span>v_{d} = \frac{1594.86}{5.8x1028\left |1.60x10^{-19}|\right } = 1.67x10^{18}(m/s)

Notice: The current I is very high for this wire. The given values of the variables are a little bit odd
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3 years ago
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