The answer is Alternating Current
66 g of element Y is needed since the ratio between element X and element Y is 1:2
Answer:

Explanation:
The average speed is defined as:

Using the equations for uniformly accelerated motion, we calculate the runner's acceleration:

Now, we can calculate the distance that the runner travels:

Finally, we calculate the runner's average speed:

W=mg
Therefore W is 50by 10 thus 500N
Answer:
p(a) * p(b) = .01923
p(b) = .01923 / .07692 = .2500