Answer:
Explanation:
Given that:
The conductivity of the material 
= 5.0 s/m
; &
The electric field intensity of the material E = 250 sin(10¹⁰ t) V/m
(a) The conduction current density 
(b) Displacement current density 
Recall that:
∴
(c) The frequency at which 
will have the same magnitude is:
By substitution
f = 90 GHz
The resistance of a conductive wire is given by:
where
is the material resistivity
is the wire length
is the cross-sectional area of the wire
The length of the wire is quadrupled, so if we call L the original length and L' the new length, we can write
Similarly, the radius of the wire is doubled (r'=2r), so the new area is
And if we substitute into the equation, we find that the new resistance of the wire is
Therefore, R=R': this means that the resistance of the wire did not change.
Given the answers I would say B, Is your best choice because when the light goes through a hole it spreads out, because most light rays (<) outward.
Answer:
The initial velocity of the gymnast is 8.5 m/s.
Explanation:
We can use the kinematic equation
to figure out the initial velocity 
of the gymnast.
Now, when the gymnast reaches the maximum height, the distance he has traveled is 
, and his velocity is zero; therefore 
.
Thus, we have
Answer:
g, downward
Explanation:
It is given that, a baseball is thrown straight upward. The force acting on the stone is force of gravity. It is moving under the action of gravity. We know that the force of gravity always acts in a downward direction.
At the highest point, the velocity of the stone will be equal to 0. It will move will constant acceleration equal to g and it always acts in downward direction.
Hence, the correct option is (e) "downward direction".
