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posledela
3 years ago
6

an object moving with a speed of 5 m/s has a kinetic energy of 100 J. what is the mass of the object?

Physics
1 answer:
elixir [45]3 years ago
5 0

Answer:40kg

Explanation:

Velocity(v)=5m/s

Kinetic energy(ke)=100j

mass=?

Mass=(2xke) ➗ v^2

Mass=(2x500) ➗ 5^2

Mass=1000 ➗ 5x5

Mass=1000 ➗ 25

Mass=40kg

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The true stress at true strain 0.05cm/cm is 80MPa

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Given that

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true strain is ε

strain hardening exponent is n

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the engineering stress(S) = \frac{F}{\frac{\pi }{4}(d^2) }

To find force (F) =

                    120 = \frac{F}{\frac{\pi }{4}(100^{2} )}

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                     F = 9425N

Calculate the true strain  (ε) = In (l₀ / l₁)

where

l₀ =  initial length of the metallic bar = 3cm

l₁ = final length of metallic bar = 3.5cm

ε = In (3.5 / 3)

  = In 1.1667

  = 0.154cm/cm

Calculate the true stress (σ) at fracture point

          = \frac{F}{\frac{\pi }{4}(d^2) }}

tensile force is F and final diameter of bar is d₁ (d in the eqn)

Substitute 9425 N for F and 0.926 cm (9.26mm) for d₁ (d in the eqn)

σ = \frac{9425}{\frac{\pi }{4}(9.26^2) }}

   = 140MPa

To find the strength coefficient (K) of the material bar

K = \frac{140}{\sqrt{0.154} }

K = \frac{140}{0.3925}

   = 356.75MPa

To calculate the true stress σ true strain of 0.05cm/cm

K  = 356.75MPa

σ = 356.75(0.05)^0^.^5

  = 356.75 ( 0.2236)

  = 80MPa

The true stress at true strain 0.05cm/cm is 80MPa

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