Assume that a 15-kg ball moving at 8 m/s strikes a wall perpendicularly and rebounds elastically at the same speed. What is the
1 answer:
So we are told that the ball rebounds elastically. What this means momentum and kinetic energy is conserved. So our initial condition equals our final condition.
Our initial condition is when the ball is moving at 8m/s and is 15 kg.
Next we our told it bounces off in the negative direction moving at 8m/s
Impulse, denoted as J, which is the change in momentum.
Hope this helps! :D
Our initial condition is when the ball is moving at 8m/s and is 15 kg.
Next we our told it bounces off in the negative direction moving at 8m/s
Impulse, denoted as J, which is the change in momentum.
Hope this helps! :D
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Answer:
Explanation:
Moving a magnet might cause a change in the magnetic field going through the solenoid. Whether or not it will change depends on the movement.
According to Faraday's law of induction a voltage is induced in a coil by a change in the magnetic flux. Magnetic flux is defined as the dot product of the magnetic field (a vector field) by the area enclosed by a loop of the coil.
The voltage is induced by the variation of the magnetic flux:
Where
ε: electromotive fore
N: number of turns in the coil
ΦB: magnetic flux
Moving the magnet faster would increase the rare of change of the magnetic flux, resulting in higher induced voltage.
Turning the magnet upside down would invert the direction of the magnetic field, reversing the voltage induced.
Answer:
2.85 rad/s
Explanation:
5 cm = 0.05 m
20 g = 0.02 kg
When dropping the 2nd object at a distance of 0.05 m from the center of mass, its corrected moments of inertia is:
So the total moment of inertia of the system of 2 objects after the drop is:
From here we can apply the law of angular momentum conservation to calculate the post angular speed