Answer:
60 m/s (in the opposite direction)
Explanation:
By conservation of momentum,
Initial momentum of board + Initial momentum of man = Final momentum of board + Final momentum of man
=> 0 + 40*12 = 8*(-v) + 0
=> v = -60 [ Negative indicates opposite direction ]
Im guessinf but it could be b
I am attaching the missing figure
If we assume 100% efficiency, this means that the input power of the transformer must be equal to the output power
We divide output/input
240,000/12,000 = 20
This means that the transformer has a turns ratio of 1:20
<span>
ns/np = 20/1 = 20
The voltage is amplified 20 times by the transformer, but this also means that the current decreases by a factor of 20, so the total power remains the same.</span>
<span>We can draw a free body diagram for one of the boxes.
There are two forces acting on the box.
The downward force is the force of gravity which is 50 N.
The upward force is the force from the tension in the rope.
Since the box is suspended, it is not accelerating.
Therefore, the net force must be zero.
Therefore the tension in the rope must be 50 N.</span>