Im really sorry. pls dont report this comment. i need points. I have a question but I am bad at english and I cant answer peoples
Group 0 - they are called the NOBLE GASES
(as they're very unreactive) because...
ALL of their atoms are full.
Example : Helium contains 2 electrons so it's outer shell is full
Efficiency of heat engine is determined by the ratio of difference in temperature of cold from hot reservoir to the temperature of hot reservoir over temperature of hot reservoir.
Note that:
The electric field lines begin from the higher voltage to the lower, because the negative pole is lower voltage than the positive pole.
Thus, The lines go out the positive charges and go in the negative charges.
Also,
Like poles repel, unlike poles attract
<u>Then The correct figure is (A)</u>
Because the speed is constant, then that means it's not accelerating. If it's not accelerating, the force is balanced, so the net force is always zero. The frictional force is the same as the force applied. Which is 85N.