Answer:
Efficiency = 77%
Explanation:
Input energy = 570 J
Output energy = 440 J
To find the efficiency;
Substituting into the equation, we have;
![Efficiency = \frac {440}{570} * 100](https://tex.z-dn.net/?f=%20Efficiency%20%3D%20%5Cfrac%20%7B440%7D%7B570%7D%20%2A%20100%20)
Efficiency = 77.19 ≈ 77%
Therefore, the efficiency of the engine is 77 percent.
Unlike acceleration and velocity, speed does not need to specify the direction of motion. Speed is a scalar quality.
PE = mgh₁ - mgh₂= 12.5J
h₁ = ?
h₂ = 0
h₁ = PE / mg = 12.5 / 9.8
Gravity or the force of gravity
Answer:
Because the different waves will feel like to bounce off to different directions, and different items will do different actions.