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What is nuclear fusion?

When two atomic nuclei are heated to a very high temperature and high pressure, for example inside a star, their nuclei can join to make a larger nucleus. Energy is released when this fusion takes place and ...
KR
Answered by Katherine R. • Physics tutor
4684 Views

How do I work out the efficiency of a process from a Sankey diagram?

The formula for efficiency is: efficiency = (useful energy / total energy) Therefore, first we must find the total energy which is the sum of all of the branches of the Sankey diagram. So take the energy spe...
KR
Answered by Katherine R. • Physics tutor
26178 Views

How do we know about the structure of the atom?

Scientists originally thought that atoms were like a 'plum pudding' in that they were a sphere of positive charge with negatively charged electrons scattered about inside it. This was because they observed f...
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Answered by Katherine R. • Physics tutor
4108 Views

How do you know when to use the imperfect tense and when to use the perfect?

The imperfect tense is used for an action that was ongoing in the past (Je lisais un roman = I was reading a novel). These verbs are often incomplete, hence, imperfect. An example of this is the sentence:Je ...
ML
Answered by Matthew L. • French tutor
3527 Views

On a day with no wind, a large object is dropped from a tall building. The object experiences air resistance during its fall to the ground. State and explain, in terms of the forces acting, how the acceleration of the object varies during its fall.

As the object is released two forces act on it.Its weight and and air resistance. At this point its weight is much greater due to the force of gravity on the object so it accelerates downward. As its speed i...
AY
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