The resistance of a wire, R ohms , is directly proportional to its length, I m, and inversely
proportional to the square of its radius, r m.
(a) Express R in terms of l, r and a constant k.
(b) Make r the subject of the formula in (a).
(c) (ii) Given that a wire with a length of 2 m and
a radius of 0.5 cm has a resistance of 40 ohms,
use your answer in (a) to find the value of k.
(ii) Hence, use your answer in (b) to find the
radius of a wire with a length of 4 m and a
resistance of 60 ohms.

e

step-by-step explanation:

an equation by definition has to have two or more variables (x and 2 in this case)

answer: its the third option.

step-by-step explanation:

i just took the test.

0.0076, if you meant 4.125 divided by 0.03125 it would be 132

step-by-step explanation:

first you have to move the decimal in 0.03125 over until its behind the 5 which is 5 places over. now the number is 3125

then you have to move the decimal in 4.125, 5 places over. now the number is 4,112,500.

now you divide like you would normally would and get 0.0076

a orange at the grocery store idk what other product that could be