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Aleksandr-060686 [28]
3 years ago
9

NEED HELP FAST ILL MARK BRAINLIEST AND RATE 5 STARS AND SAY THANK YOU

Physics
2 answers:
daser333 [38]3 years ago
8 0

Acceleration = (change in speed)/(time for the change)

Change in speed = (end speed) - (start speed)

Change in speed = (10 m/s) - (20 m/s) = -10 m/s

Time for the change = 5.00 seconds

Acceleration = (-10 m/s) / (5 sec)

<em>Acceleration = -2 m/s²</em>

That's choice-A .

nexus9112 [7]3 years ago
8 0

Hello!

A car going 72.0 km/h (20.0 m/s) slows down to 36.0 km/h (10.0 m/s) in 5.00 seconds. Calculate the acceleration in m/s² .

We have the following data:

a (acceleration) = ? (in m/s²)

Vi (initial velocity) = 20 m/s

Vf (final velocity) = 10 m/s

Δv (velocity variation) = Vf - Vi , then:

\Delta{V} = V_f - V_i

\Delta{V} = 10 - 20

\Delta{V} = - 10\:m/s

Δt (time variation) = 5 s

We apply the data to the average acceleration formula, see:

a = \dfrac{\Delta{V}}{\Delta{T}}

a = \dfrac{- 10\:\dfrac{m}{s} }{5\:s}

\boxed{\boxed{a = - 2\:\dfrac{m}{s^2} }}\end{array}}\qquad\checkmark

Answer:

A. -2.00

_______________________________

I Hope this helps, greetings ... Dexteright02! =)

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enot [183]

Answer:

  • 1.78×10⁶ C

Explanation:

Using the atomic mass of pluonium atoms (244 g/mol), you can calculate the number of atoms in 47.0 g. Then, knowing that each plutonium atom has 96 protons, you calculate the number of protons in the 47.0 g sample. Finally, using the positive charge of one proton, you calculate the total positive charge in the 47.0 g of plutonium.

<u>1. Number of atoms of plutonium in 47.0 g</u>

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  • Number of protons = 1.15998×10²³ atoms × 96 protons/atom = 1.11385×10²⁵ protons

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<u />

  • Charge = charge of one proton × number of protons

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3 years ago
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