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Sholpan [36]
3 years ago
8

Can someone explain it with steps?

Physics
2 answers:
Yakvenalex [24]3 years ago
8 0
  • Initial velocity=15m/s=u
  • Final velocity=0
  • deacceleration=a

Distance traveled during reaction time

  • 15(0.4)=6m

Total distance

  • 21-6-1=14m

\\ \sf\longmapsto v^2-u^2=2as

\\ \sf\longmapsto -(15)^2=2(14)a

\\ \sf\longmapsto -225=28a

\\ \sf\longmapsto a=-8.0m/s^2

Anton [14]3 years ago
5 0

Answer:

Option C is the correct answer

Explanation:

Distance travelled by car during reaction time

=15\times0.4\\\\=6m

The car stopped before hitting the animal by 1 m

Distance travelled during deceleration is 21-6-1=14m

Hence by v^2=u^2+2as

We have

0^2=15^2+2 \cdot a \cdot 14\\\\a=\frac{-225}{28} \\\\=-8.03m/s^2

Option C is the correct answer

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Answer:

If energy is conserved, then the sum of the potential energy and the kinetic energy is a constant.

Assuming the proton starts from rest, so it's kineitc energy is zero, but it has a potential energy, PE equal to:

PE = qV

where q =1.6 x 10^-19 C

and V = 1.00 V

Assuming the proton no longer experiences the potential energy and it is all converted to kinetic energy then:

PE* = 0,

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Now since

PE + KE = Total energy =PE* + KE*

Therefore,

qV + 0 = 0 + 1/2mv^2

Or

KE = qV = 1.6 10^-19 J

4 0
3 years ago
Which is the best example of the use of imagery in a sentence?
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Answer:

Common Examples of Imagery

Taste: The familiar tang of his grandmother's cranberry sauce reminded him of his youth. Sound: The concert was so loud that her ears rang for days afterward. Sight: The sunset was the most gorgeous they'd ever seen; the clouds were edged with pink and gold.

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6 0
3 years ago
A wire is used as a heating element that has a resistance that is fairly independent of its temperature within its operating ran
dedylja [7]

Answer:

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Now let:

E2= k I₂^2

E2= 4E

⇒ k I₂^2= 4* k I^{2}

Cancel same terms on both sides.

I₂^2= 4* I^{2}

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If we double the current the energy delivered each minute be 4E.

3 0
3 years ago
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Oksana_A [137]

Answer:

α = - 1.883 rev/min²

Explanation:

Given

ωin = 113 rev/min

ωfin = 0 rev/min

t = 1.0 h = 60 min

α = ?

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ωfin = ωin + α*t      ⇒     α = (ωfin - ωin) / t

⇒     α = (0 rev/min - 113 rev/min) / (60 min)

⇒     α = - 1.883 rev/min²

6 0
3 years ago
A large mass has (less or more) mass energy than a smaller mass at the same temperature?
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Answer:

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Explanation:

hope this help

4 0
3 years ago
Read 2 more answers
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