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Why do you consider some changes to be useful and at the same time harmful?
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What are the observable changes in freezing water?
liquid to solid
During an energy transfer what happens to the total amount of energy?
Energy can not be destroyed, so the total amount of energy before a change is equal to the amount of energy after the change. However, some energy is changed into a useful form, but some may be wasted and not used. For example, a light bulb, changes electrical energy into light energy, but some of the energy is changed to heat and some to sound, these are not useful and are wasted, but are changed nonetheless. So a transformation from mechanical energy to heat will have the same total energy at the start as at the finish, but unless it is 100% efficient some of the original energy will be 'lost'
Why is it important to keep the temperature and the amount of water the same when testing surface area?
The temperature and the amount of water need to be kept the same so that the only variable that changes is surface area. If you allow the temperature and/or the amount of water to change too, you will not know which variable is causing the changes that you observe.
Why is body temperature not a good fixed temperature for establishing a temperature scale?
Not everyone has the same body temperature and it changes with throughout the day
What theory states that species stay the same for a long time and then change quickly because of environmental changes?
Good ol' punctuated equilibrium.
The Bible is only useful for Christmas?
For Christians, the Bible is useful for life. In the same way, other religious books are indispensible for true followers of those religions. If people consider their holy books useful only for important festival occasions, they aren't religious (or, if you prefer, superstitious). It's the same as only attending holy services for particular feast days, or weddings or funerals.
What is the functions of buffer?
to resist drastic changes in the pH of a solution
Petrol used in a car harmful or useful?
petrol is the same as gas for one. and two because it has a low combustion point making it easier to ignite. petrol is the same as gas for one. and two because it has a low combustion point making it easier to ignite.
Can two solids with the the same volume have different densities?
Of course. Consider a teaspoonful of ice and a teaspoonful of lead.That's the thing about 'density' ... the thing that makes it such a useful concept: Density is a descriptionof the substance, and has nothing to do with the volume of the sample. A thimbleful and a supertankerfulof the same substance have the same density.
Petrol is useed in a car engine-useful or harmful?
petrol is the same as gas for one. and two because it has a low combustion point making it easier to ignite. petrol is the same as gas for one. and two because it has a low combustion point making it easier to ignite.
What is the same about physical changes and chemical changes?
they both change in same ways!
What does the Track Changes command do?
It allows a user to show the changes they have made, like deleting or editing text. It is particularly useful when more than one person is working on the same document. People can see their own changes and changes made by others and they can choose to revert the changes or to keep them.
How plastic is harmful for nature in hindi?
It is harmful chemicals and physical effects
What are some examples of useful and harmful effects of mixture and substances on health and environment?
Mixtures and substances such as pesticide runoff can pollute streams and water. These same substance help crops be more productive, but they also pose serious health problems.
Does the Vector Velocity change if the angle changes?
Yes. You can consider a vector of being made up of a magnitude (size) and a direction. If any of the two changes, it is no longer the same vector. Alternately, you can also consider a vector (in two dimensions, for simplicity) as being made up of an x-component and a y-component. It is not possible to change the angle without changing at least one of the two components.
What are phyisical changes?
Changes that occur when the composition remains the same
When gravitational force changes. changes to the same degree?
Weight
