1.) if you are sitting still are you accelerating? How do you know?
1 answer:
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Answer:
Velocity
v= i + 2 j
Acceleration
a= 2 j
Explanation:
Given that
r(t) = t i + t² j + 3 k
We know that
Velocity v given as
v= dr/dt
dr/dt= i + 2 t j +0
v= i + 2 t j
At t= 1
v= i + 2 x 1 j
v= i + 2 j
Acceleration ,a
a= dv/dt
v= i + 2 t j
dv/dt= 2 j
a= 2 j
The relationship between the resistance R of a wire and its resistivity 
is given by
where L is the length of the wire and A is its cross sectional area.
In the problem, we have
, 
and 
. So we can solve the find the area A:
For a cylindrical wire, the cross sectional area is given by
where r is the radius. We know the value of the area A, so now we can find the radius of the wire:
where L is the length of the wire and A is its cross sectional area.
In the problem, we have
For a cylindrical wire, the cross sectional area is given by
where r is the radius. We know the value of the area A, so now we can find the radius of the wire: