The emf induced in the coil is given by Faraday-Neumann-Lenz law:
where
is the variation of magnetic flux through the coil
is the time interval
The magnetic field intensity is
Since the magnetic field strength is constant, the variation of flux through the coil is given by
(1)
where N=550 is the number of turns, while
is the variation of area of the coil. We can re-write (1) as
The time interval is
, therefore the induced emf is
Answer:
The minimum time taken is 3.84 s.
Explanation:
The expression for the equation of motion is as follows;
v= u+at
Here, v is the final speed, u is the initial speed, a is the acceleration and t is the time.
Convert the initial speed from to .
Convert the final speed from to .
It is given in the problem that The brakes on your automobile are capable of creating a deceleration of . The sign of the acceleration is negative here as there is deceleration.
Calculate the minimum time by using equation of motion.
v= u+at
Put , and
21.11= 39.17+(-4.7)t
t= 3.84 s
Therefore, the minimum time taken is 3.84 s.
Answer:
Red ball
Explanation:
Two ball of equal mass when fall on the surface from the same height means that both balls have same potential energy.
when the ball collides with the floor both ball posses same velocity.
but according to the statement given that red ball rebounds higher position means that the change of the velocity of the red ball is more the blue ball.
so, the change in momentum of the red ball is more than the blue ball which means the impulse during collision of the red ball will be more.
I think you're asking what his 'ke' will be. Does that mean his 'kinetic energy' ? Well, that'll just be
<em>ke = (1/2) x (his mass) x (his speed when he touches down)²</em>