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goldenfox [79]
4 years ago
14

Scientists and engineers design new technologies to help solve problems. Often, a new technological design will contain a flaw.

Which of the following is true about such a flaw? A. It should be studied so that the design can be fixed or a new design can be proposed. B. It means that the problem being investigated cannot be solved. C. It means that the people who proposed the design should not be scientists or engineers. D. It makes the technological design useless.
Physics
1 answer:
IRINA_888 [86]4 years ago
7 0

The correct answer is A

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In terms of positive and negative charges what causes lightning?
erik [133]

Answer:

Electrostatic Discharge during the equalization of the separated positively and negatively charged electrostatic charges in the storm clouds.

Explanation:

In nature, lightning occurs during the discharge of the large charges contained in the separated positively and negatively particles in the atmosphere in the process equalizing (neutralizing) of the charges, leading to the release of instantaneous energy in the form of heat, light and sound

During a storm, as the clouds mixes by the wind with different densities, they rub each other forming electrostatic charges. The lighter positively charged particles rise to the top clouds while the heavier negatively charged particles move to the bottom. The charges continue to add up to a point where their magnitudes is large enough such that a big spark or lightening occurs between the positive and negative charges during the process of re-equalization of the charges to revert to neutrality.

7 0
3 years ago
Assume that the pictured magnet is being moved into the solenoid. If the polarity of the magnet is reversed and then moved into
KonstantinChe [14]

Answer:

The direction of induced emf is revered and hence the direction of the induced current.

Explanation:

If the polarity of the magnet is reversed, the direction if the field lines through the solenoid is also reversed, which according to Faraday's law means

\varepsilon  =N\dfrac{d\Phi}{dt} \rightarrow -N\dfrac{d\Phi}{dt}

in other words, the direction of the magnetic flux is revered, and therefore, the direction of the induced emf is also revered.

Furthermore, according to Ohm's law

I = \dfrac{\varepsilon}{R}

which tells us that if the induced emf changes sign <em>(is reversed)</em>

I = -\dfrac{\varepsilon}{R}

the direction of the induced current is also reversed.

7 0
3 years ago
If the range of the projectile is 4.3 m, the time-of-flight is T = 0.829 s, and air resistance is negligible, determine the foll
ankoles [38]

Answer

given,

range of the projectile = 4.3 m

time of flight = T = 0.829 s

v =\dfrac{d}{T}

v =\dfrac{4.3}{0.829}

     v = 5.19 m/s

vertical component of velocity of projectile

v_y = gt'

v_y = 9.8 \times {\dfrac{T}{2}}

v_y = 9.8 \times {\dfrac{0.829}{2}}

v_y =4.06\ m/s

a) Launch angle

 \theta = tan^{-1}(\dfrac{v_y}{v})

 \theta = tan^{-1}(\dfrac{4.06}{5.19})

    θ = 38°

b) initial speed of projectile

  v = \sqrt{v_x^2 + v_y^2}

  v = \sqrt{5.19^2 + 4.06^2}

         v = 6.59 m/s

c) maximum height reached by the projectile

     y_{max}=v_{avg}t'

     y_{max}=\dfrac{1}{2}v_y\dfrac{T}{2}

     y_{max}=\dfrac{1}{2}\times(g\dfrac{T}{2})\times\dfrac{T}{2}

     y_{max}=\dfrac{gT^2}{8}          

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4 years ago
What are compounds made of
nlexa [21]
Two or more elements that are chemically combined
6 0
3 years ago
I’ve already figured out A. I just need help with B and C.
Damm [24]

Answer:

595433.00

1456543.00

Explanation:

7 0
3 years ago
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