B, a disurbance would make it unstable and affect the center of mass, which would then affect the equilibrium.
Testable hypotheses could be developed for questions <em>B, D, and E</em> .
The main problem with A and C is the word "better". This is a rubber word. It means different things to different people, and it can mean different things to the same person at different times. It's always a matter of opinion, it has no unique units of measure, and there is no concrete way to measure it. Not good for developing a testable hypothesis.
Answer:
The actual work output is 1,125 kilojoules.
Explanation:
Energy efficiency is defined as the efficient use of energy. An appliance, process, or facility is energy efficient when it consumes less than the average amount of energy to perform an activity. Then, energy efficiency is the ratio between the amount of energy used in an activity and the amount expected to be carried out.
Efficiency is calculated as:
efficiency = output / input
Where output is the amount of mechanical work (in watts) or energy consumed by the process (in joules), and input (input) is the amount of work or energy that is used as input to carry out the process.
In this case:
- Efficiency always has a value between 0 and 1. In this case, efficiency=0.15
- output=?
- input= 7500 kilojoules
Replacing:
0.15=output/7500 kilojoules
Solving:
Output=0.15* 7500 kilojoules
output=1,125 kilojoules
<u><em>The actual work output is 1,125 kilojoules.</em></u>
