Because 83kJ of heat is released when 1 mol of Calcium Chloride is dissolved. The question states 0.01 mol is used so 0.01mol x 83kJ/mol = amount of heat released by 0.01 mol
Max velocity in shm is when x=0, i.e. centre of motion. This is when acceleration is 0. For that question you could integrate it to find v in terms of x.
What you said about maxima and acceleration = 0 isn't correct. Acceleration is max there
Most is memory, other than the skills ones like calculations and drawing DFDs. So I disagree on the need for understanding the content.
So it is very easy to self-teach
How strange, initially I used the 7/10 way but never arrived at the answer.
And now after looking at deterministic's answer, 9/10 x 7/9 = 7/10. Mindfuck lol
9/10 shots make it. 1/5 shots are bullseyes, therefore 2/10 are expected to be bullseyes.
Of the shots that make it in 10 shots, 2/9 are expected to be bullseye and 7/9 are not.
Without me writing up a whole heap, your x and y or your p and q (whatever you use to represent chances of success...