The answer is the letter c
We can begin with the following formula for the resistance of a wire:
We assume that resistivity
of both wires is the same. So they differ in length
and cross-sectional area
.
We assume that both wires are perfect cylinders, which means that their cross section is given by the following formula:
.
Where r is the radius of a wire. Diameter is just 2*r.
With all of this information, we can write equations for the resistance of both wires and then just divide them to find the ratio.
For wire 2 we have:
For cross section A, we write
, because if the diameter of wire two is twice as big that means it's radius is twice as big. Keep in mind we are only interested in ratios here.
For wire 1 we write:
.
When we divide those two equations we get:
Cypress trees are adapted to living in wet environments.
Answer:
Psychiatrists are medical doctors, psychologists are not. Psychiatrists prescribe medication, psychologists can't. Psychiatrists diagnose illness, manage treatment and provide a range of therapies for complex and serious mental illness. Psychologists focus on providing psychotherapy (talk therapy) to help patients.
Explanation:
Answer:
food drug and insecticide administration