What should you do when you cut your palm on a small piece of broken glass that is lying on the lab bench?
1 answer:
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Answer:
Torque,
Explanation:
Given that,
The loop is positioned at an angle of 30 degrees.
Current in the loop, I = 0.5 A
The magnitude of the magnetic field is 0.300 T, B = 0.3 T
We need to find the net torque about the vertical axis of the current loop due to the interaction of the current with the magnetic field. We know that the torque is given by :
Let us assume that,
is the angle between normal and the magnetic field,
Torque is given by :
So, the net torque about the vertical axis is . Hence, this is the required solution.
The collision is elastic. This means that both momentum and kinetic energy are conserved after the collision.
- Let's start with conservation of momentum. The initial momentum of the total system is the sum of the momenta of the two balls, but we should put a negative sign in front of the velocity of the second ball, because it travels in the opposite direction of ball 1. So ball 1 has mass m and speed v, while ball 2 has mass m and speed -v:
So, the final momentum must be zero as well:
Calling v1 and v2 the velocities of the two balls after the collision, the final momentum can be written as
From which
- So now let's apply conservation of kinetic energy. The kinetic energy of each ball is
. Therefore, the total kinetic energy before the collision is
the kinetic energy after the collision must be conserved, and therefore must be equal to this value:
(1)
But the final kinetic energy, Kf, is also
Substituting as we found in the conservation of momentum, this becomes
we also said that Kf must be equal to the initial kinetic energy (1), therefore we can write
Therefore, the two final speeds of the balls are
This means that after the collision, the two balls have same velocity v, but they go in the opposite direction with respect to their original direction.
- Let's start with conservation of momentum. The initial momentum of the total system is the sum of the momenta of the two balls, but we should put a negative sign in front of the velocity of the second ball, because it travels in the opposite direction of ball 1. So ball 1 has mass m and speed v, while ball 2 has mass m and speed -v:
So, the final momentum must be zero as well:
Calling v1 and v2 the velocities of the two balls after the collision, the final momentum can be written as
From which
- So now let's apply conservation of kinetic energy. The kinetic energy of each ball is
the kinetic energy after the collision must be conserved, and therefore must be equal to this value:
But the final kinetic energy, Kf, is also
Substituting
we also said that Kf must be equal to the initial kinetic energy (1), therefore we can write
Therefore, the two final speeds of the balls are
This means that after the collision, the two balls have same velocity v, but they go in the opposite direction with respect to their original direction.