Answer:
An arcsecond, also called a second of an arc, is a unit of measurement that amounts to one sixtieth of an arcminute. Simply put, it is equal to 1/3600 degrees of an arc. The symbol used to mark an arcsecond is the double quote.
Explanation:
Answer:
A, B and F are the right answers
Explanation:
The formula is 
A) Increasing both the radius and the speed by a factor of 9
=
<u><em>which means the acceleration will increase by a factor of 9</em></u>
B) Keeping the speed fixed and decreasing the radius by a factor of 9
=
<u><em>which means the acceleration will increase by a factor of 9</em></u>
C) Keeping the radius fixed and increasing the speed by a factor of 9
=
It will increase the acceleration 81 times
D) Keeping the speed fixed and increasing the radius by a factor of 9
=
It will decrease the acceleration by 9 times
E) decreasing both the radius and the speed by a factor of 9
=
It will decrease the acceleration by 9 times
F) Keeping the radius fixed and increasing the speed by a factor of 3
=
<u><em>It will increase the acceleration by 9 times </em></u>
The resultant of the given forces is; 6√2 N
<h3>How to find the resultant of forces</h3>
We are given the forces as;
10 N along the x-axis which is +10 N in the x-direction
6 N along the y-axis which is +6N in the y-direction
4 N along the negative x-axis which is -4N
Thus;
Resultant force in the x-direction is; 10 - 4 = 6N
Resultant force in the y-direction is; 6N
Thus;
Total resultant force = √(6² + 6²)
Total resultant force = 6√2 N
Read more about finding resultant of a force at; brainly.com/question/14626208
Answer:7.67
Explanation:
Given
Weight of Cathy 
Force exerted by rope 
Mechanical advantage is the ratio of load by Pulling effort



THere is a standard relationship that gives this result where the capacity of the capacitor is used:

.
We know though that Q/c=V and thus we can use the relationship:
E=Q*V/2 where we have just substituted in. If we also take into account that Q=VC, we can also get that E=V^2*C/2.
We are given the charge and the potential, so the best expression to use is the middle one.
Substituting, we get that E=1/2*8*10^(-10)*20=8*10^(-9).
The answer is B