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Pavlova-9 [17]
2 years ago
5

What is the momentum of a 50 kg object traveling 200 m/s

Physics
1 answer:
garik1379 [7]2 years ago
3 0
Momentums equation is just p=mv
mass times velocity so 50x200
p=10,000
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An airplane of mass 1.60 ✕ 104 kg is moving at 66.0 m/s. The pilot then increases the engine's thrust to 7.70 ✕ 104 N. The resis
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(a) No, because the mechanical energy is not conserved

Explanation:

The work-energy theorem states that the work done by the engine on the airplane is equal to the gain in kinetic energy of the plane:

W=\Delta K (1)

However, this theorem is only valid if there are no non-conservative forces acting on the plane. However, in this case there is air resistance acting on the plane: this means that the work-energy theorem is no longer valid, because the mechanical energy is not conserved.

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F=7.70\cdot 10^4 N - 5.00 \cdot 10^4 N=2.70\cdot 10^4 N

Now we can calculate the acceleration of the plane, by using Newton's second law:

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Finally, we can calculate the final speed of the plane by using the equation:

v^2- u^2 = 2aS

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v=? is the final velocity

u=66.0 m/s is the initial velocity

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S=5.00 \cdot 10^2 m is the distance travelled

Solving for v, we find

v=\sqrt{u^2+2aS}=\sqrt{(66.0 m/s)^2+2(1.69 m/s^2)(5.00\cdot 10^2 m)}=77.8 m/s

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