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UkoKoshka [18]
3 years ago
8

Please help!!

Physics
1 answer:
aalyn [17]3 years ago
5 0

Answer: C. Equations were used to identify regions around the nucleus where electrons would likely be.

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Samuel throws a ball into the air 20 meters. It reaches the top of its flight at 2
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10 m/s

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Calculate the GPE of a rock with a mass of 55kg on a cliff that is 27m high
GaryK [48]

Answer:

<em>P=mgh</em>

<em>P=mghm=55</em>

<em>P=mghm=55g=9.8 or ~10</em>

<em>P=mghm=55g=9.8 or ~10h=27</em>

Explanation:

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2 years ago
Can objects in a system have momentum while the momentum of the system is zero? explain your answer.
alexgriva [62]
Yes.  Momentum is a vector, so several non-zero momenta can add up to zero.  Consider for a simple example a mass of 10kg moving to the right at 5m/s, and another mass of 10kg moving to the left at 5m/s.  These momenta each have a magnitude equal to 50 kg m/s but have opposite sign and so the total system's momentum is zero.
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4 years ago
If you drive through water, your brakes may become slippery and ineffective. To dry the brakes off, __________.
GenaCL600 [577]

Answer:

C

Explanation:

Water at normal temperature is a good lubricant  and will hinder the brake from working properly when  the road is wet. To dry the brakes off, apply brakes gently as you accelerate. This will generate some heat that will evaporate the water with the help of friction.

8 0
4 years ago
The temperature coefficient of a certain conducting material is 5.74 × 10-3 (°C)-1. (a) At what temperature would the resistance
Alex777 [14]

Answer:

Temperature at which the resistance is twice the resistance at 20^{\circ}C is 194.216^{\circ}C

Solution:

As per the question:

Temperature coefficient, \alpha = 5.74\times 10^{- 3}^{\circ}C

Reference temperature, T_{o} = 20^{\circ}C

Resistance, R_{t} = 2R_{o}

Now, using the formula:

R_{t} = R_{o}(1 + \alpha \Delta T)

2R_{o} = R_{o}(1 + \alpha \times (T _ T_{o}))

2 = 1 + 5.74\times 10^{- 3}\times (T - 20^{\circ})

\frac{1}{5.74\times 10^{- 3}} = T - 20^{\circ}

T = 174.216 + 20 = 194.216^{\circ}

  • Yes, this temperature holds for all all the conductors of copper, irrespective of the size and shape of the conductor.

5 0
3 years ago
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