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d1i1m1o1n [39]
3 years ago
7

I need help with my physics homework agh! Please help it's due tomorrow. ​

Physics
1 answer:
storchak [24]3 years ago
4 0

Rubbing both pieces cause each piece to have a negative charge.

When two parts have the same they repel each other, so holding one piece up tot he end of the other piece would push it away.

Because one piece is held in the middle by a string, it would rotate the piece in a circle.

If they held the piece to the other end of the one held by a string it would start to rotate in the opposite direction.

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A lightning flash releases about 1010J of electrical energy. Part A If all this energy is added to 50 kg of water (the amount of
zavuch27 [327]

Answer:

water is in the vapor state,

Explanation:

We must use calorimetry equations to find the final water temperatures. We assume that all energy is transformed into heat

        E = Q₁ + Q_{L}

Where Q1 is the heat required to bring water from the current temperature to the boiling point

      Q₁ = m c_{e} ( T_{f} -T₀)

      Q₁ = 50 4180 (100 - 37)

      Q₁ = 1.317 10⁷ J

Let's calculate the energy so that all the water changes state

     Q_{L}  = m L

     Q_{L}  = 50 2,256 106

    Q_{L}  = 1,128 10⁸ J

Let's look for the energy needed to convert all the water into steam is

     Qt = Q₁ + Q_{L}  

     Qt = 1.317 107 + 11.28 107

     Qt = 12,597 10⁷ J

Let's calculate how much energy is left to heat the water vapor

     ΔE = E - Qt

     ΔE = 10¹⁰ - 12,597 10⁷

     ΔE = 1000 107 - 12,597 107

     ΔE = 987.4 10⁷ J

With this energy we heat the steam, clear the final temperature

     Q = ΔE = m c_{e} ( T_{f}-To)

    ( T_{f}-T₀) = ΔE / m c_{e}

      T_{f} = T₀ + ΔE / m c_{e}

      T_{f} = 100 + 987.4 10⁷ / (50 1970)

      T_{f} = 100 + 1,002 10⁵

      T_{f} = 1,003 10⁵ ° C

This result indicates that the water is in the vapor state, in realizing at this temperature the water will be dissociated into its hydrogen and oxygen components

4 0
3 years ago
How does the atmosphere affect life on earth? Include both positive and negative effects.
shutvik [7]

The Earth's atmosphere blocks the sun's rays as they travel toward us. The atmosphere's layers act as a filter, allowing just the radiation needed to support life to pass through while blocking the dangerous radiation from reaching the Earth's surface. Our globe is warmed by the sun's energy as it travels through the atmosphere, supplying light energy for photosynthesis and powering the biogeochemical cycles in the Earth's systems. The object that cannot pass through, on the other hand, is reflected back into space.

The global temperature does, however, increase as more heat is trapped by the atmosphere. Global warming is the name of this occurrence.

Global warming is the phenomenon that results in a change in our climate. Natural calamities like wildfires, flooding, and severe storms occur more frequently when this happens.

Learn more about atomsphere here:

brainly.com/question/24925283

#SPJ9

5 0
1 year ago
A 77.0 kg rider sitting on a 7.3 kg bike is riding along at 9.3 m/s in the positive direction. The rider drags a foot on the gro
saw5 [17]

Answer with Explanation:

We are given that

Mass of rider=m=77 kg

Mass of bike =m'=7.3 kg

Initial velocity,u=9.3 m/s

Final velocity,v=6 m/s

A.Change in velocity=v-u=6-9.3=-3.3 m/s

Total mass,M=m+m'=77+7.3=84.3 kg

Change in momentum=M(v-u)=84.3(-3.3)=-278.19 kgm/s

B.Impulse=Ft=Change in momentum=-278.19kg m/s

C.Time,t=13.2 s

v=u+at

Using the formula

6=9.3+13.2a

13.2a=6-9.3=-3.3

a=-\frac{3.3}{13.2}=-0.25 ms^{-2}

F=ma

F=84.3(-0.25)=-21.075 N

D.S=ut+\frac{1}{2}at^2

S=9.3(13.2)+\frac{1}{2}(-0.25)(13.2)^2

S=100.98 m

5 0
3 years ago
A series circuit has four resistors. The current through one resistor is 810 mA. How much current is supplied by the
Serhud [2]

Answer:

Correct answer:  810 mA

Explanation:

In the series connection of a resistor,the current flowing through one resistor is the same through all four resistors and therefore throughout the entire electrical circuit.

God is with you!!!

8 0
2 years ago
Among main sequence stars, those with the highest surface temperatures have ___________. Among main sequence stars, those with t
Helen [10]

Answer:

Option b

Explanation:

  • Higher mass of the main sequence stars give rise to larger compression leading to higher surface temperatures which in turn results in faster rate of fusion leading to greater luminosity.
  • The luminosity depends on the reactions in the core. the higher the reaction sin the core the more is the luminosity of the main sequence star.
  • The lifetimes of the highest masses stars of the main sequence is the shortest  because of the reason that in spite of having a greater amount of hydrogen inside for nuclear reactions, the rate of consumption of this hydrogen is quite fast.
7 0
3 years ago
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