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Rina8888 [55]
3 years ago
8

Several students in the group made comments to the Coach about the back pack. Which student has the correct analysis of the forc

es and motion of the back pack?
Physics
1 answer:
kolbaska11 [484]3 years ago
7 0

Answer:

20%

Explanation:

Efficiency of an engine is a ratio in percentage of the work done to the energy intake of the engine.

η=(q₁-q₂)/q₁×100%

η is efficiency, q₁ is the energy intake, q₂ is energy wasted.

the information provided is:

energy intake = 400 j

work done = 80 j = (400-320) =q₁-q₂

energy wasted =320 j

η= 80/400×100%

=20%

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Explanation:

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<h3>What is electric force?</h3>

Force on the particle is defined as the application of the force field of one particle on another particle. It is a type of virtual force.

The electric force in the second case will be the same as in the first case. Therefore the force on the particle will be the same.

\rm F= K\frac{q_2q_3}{r^2}

\rm F= 9\times 10^9 \times \frac{1.6 \times 10^{-13}\times 1.6\times10^{-13}}{(0.5)^2}

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Hence the electrical force between q₁ and q₃ will be –1. 1 × 10¹¹ N.

To learn more about the electric force refer to the link;

brainly.com/question/1076352

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Vinvika [58]

Answer:

C

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Ira Lisetskai [31]

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5.867 m/s^2

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Initial Speed > 0 m/s

Final Speed > 20 m/s

Time > 5 sec.

8 0
4 years ago
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