Answer:
Explanation:
As we know by energy conservation
All its kinetic energy will convert into thermal energy to raise its temperature
now divide both sides by mass of the object
so change in temperature is given as
When a magnet is moved through a coil of wire, an electric current is generated in the coil because
1 answer:
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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.
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Explanation:
Let be the airspeed.
Let be the cross wind speed.
We know that,ground speed is the vector sum of airspeed and cross wind speed and airspeed is perpendicular to cross wind speed.
If and
are two perpendicular vectors,the resultant vector has the magnitude
Given,
So,the ground speed is