It depends on the size of the box.
-- If it's one of the boxes printed on a sheet of graph paper,
then he should report the measurement in millimeters.
-- If it's the box that his new smartphone arrived in, then
he should probably use centimeters.
-- If it's the box that the new tractor was shipped to his
grandfather's farm in, then meters is the best unit.
When an object is becomes warm its an example of exothermic reaction.
Answer:
Shadows are formed when an opaque object or material is placed in the path of rays of light. The opaque material does not let the light pass through it. The light rays that go past the edges of the material make an outline for the shadow
Explanation:
To solve this problem it is necessary to apply the concepts related to Faraday's law and the induced emf.
By definition the induced electromotive force is defined as


Where,
Electric field
B = Magnetic Field
A = Area
At the theory the magnetic field is defined as,

Where,
N = Number of loops
I = current
Permeability constant
We know also that the cross sectional area, is the area from a circle, and the length is equal to the perimeter then
A = \pi r^2
l = 2\pi r
Replacing at the previous equation we have that

Where,
R = Radius of the solenoid
r = The distance from the axis
Re-arrange to find the current in function of time,

Replacing our values we have

