Answer:
t=0.47s
Explanation:
the ball has uniformly accelerated movement due to gravity
Vo=initial speed=4.6m/s
g=gravity=-9.8m/s^2
Vf=final speed=0, the player must wait for the ball to stop. so the final speed will be 0
we can use the following ecuation
T=(Vf-Vo)/g
T=(0-4.6)/-9.8m/s^2
T=0.47s
The plastic strip becomes positively charged is because A) the plastic strip acquired extra protons during the charging process from the cotton. So, correct option is A.
Every object is made up of equal number of electrons and protons. Since charges are neutral because of equality, that is the reason behind every object is stable in this universe.
On rubbing with cotton cloth, a plastic strip acquired positive charge. Since, plastic strip is composed of electrons and cotton cloth is composed of positive protons. When we rubbed both of objects, because of opposite charge both of the charges cancelled each other.
Now, only positive charge of plastic strip remains and positive charge of cotton cloth remains. So, we know very well that like charges repel each other.
Therefore, at last plastic strips contains only positive charge and that is the reason of becoming positively charged after rubbing.
Hence, correct option is A.
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Answer:
buena suerte con las citas del futuro
Explanation:
Answer: meter kilometer inch
Explanation:
<span><span>Group1 Melting point63.5°C, 146.3°F, 336.7 K </span><span>Period4 Boiling point759°C, 1398°F, 1032 K </span><span>Blocks Density (g cm−3)0.89 </span><span>Atomic number19 Relative atomic mass39.098 </span><span>State at 20°CSolid Key isotopes<span>39K </span></span></span>