Afuse in an electric circuit is a wire that is designed to melt, and thereby open the circuit, if the current exceeds a predetermined value. suppose that the material to be used in a fuse melts when the current density rises to 350 a/cm2. what diameter of cylindrical wire should be used to make a fuse that will limit the current to 0.58 a?

0.04594 cm

Explanation:

So, we need the wire melt when the max current density its . Now, we got our limit current, 0.58 A.

The current density its , so, with our data, we can obtain the cross area of the wire.

For a cylinder, the area its given by:

We can put all this in the equation for the max current density:

And now, we can work it a little:

using our values, max current density = ,   and limit current = 0.58 A,

And, of course, the diameter its two times the radius:

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.