Answer:
It is classified as a metal because of its high ductility, malleability, thermal and electrical conductivity and resistance to corrosion. Copper is a mineral used for our everyday use. It is limited and we have to use it wisely because it is not evenly distributed everywhere and also everyone needs it. Copper is element number 29 on the Periodic Table of Elements. It is also used it electronics and wiring.
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Answer: Option (A) and (D) are the correct statements.
Explanation:
Potential energy is defined as the energy obtained by an object due to its position. Whereas kinetic energy is defined as the energy obtained by an object due to the motion of its molecules.
When there will be only one phase present then addition or removal of energy will lead to change in kinetic energy of the substance but no change in potential energy will take place.
Whereas if change in phase is occurring then adding or removing any energy will lead to change in potential energy of the substance while kinetic energy will remain the same.
Thus, we can conclude that correct statements are as follows.
- While only one phase is present, adding or removing energy changes PE but not KE.
- During a phase change, adding or removing energy changes PE but not KE.
Answer:20s
To find speed we have to divide speed and distance
5=100/?
100/5=20
Answer:
electricity consumption in United states was about 3.9 trillion kilolwatthours(kWh) in 2019 electricity is an essential part of morden life
Answer:
is in units of 
is in units of 
is in units of 
Explanation:
We have the following expression:
Where:
is the distance, hence its unit is (meters, assuming we are using the International System of Units)
is the time, hence its unit is 
(seconds)
So, the expression is rewritten as:
Since the left side of the equation is in meters, the right side must be in meters as well.
In addition, in the right side we have terms that have to added, this means each term must be in meters:
- For the first term must be in units of in order to have meters.
- For the second term must be in units of in order to have meters.
- For the third term must be in units of in order to have meters.
