How fast does a 500kg car need to drive to have 100,000 J of kinetic energy?
1 answer:
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Both the total momentum and the total kinetic energy are conserved
Explanation:
- In a collision between two or more objects, if there are no external forces acting on the system (isolated system), the total momentum of the objects is always conserved. This is called principle of conservation of momentum, and can be written as follows:
where
m, M are the masses of the two objects
u, U are the initial velocities of the two objects
v, V are the final velocities of the two objects
- The total kinetic energy, however, is not always conserved. In fact, we have two types of collision:
1) In a perfectly elastic collision, the total kinetic energy of the objects is conserved. This means that we can write the following equation:
2) In an inelastic collision, the total kinetic energy of the object is NOT conserved. This means that part of the total kinetic energy is "lost", converted into other forms of energy (mainly thermal energy, due to the presence of frictional forces within the system). The most extreme case is called perfectly inelastic collision, in which the two objects stick together after the collision, and there is the maximum loss of kinetic energy.
Learn more about collisions:
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Answer:
The amount of charge on the plates is now equal to half its original value
Explanation:
From the question we are told that
The charge on the plate is Q
The initial separation is
The new separation is
Generally the capacitance of the capacitor is mathematically represented as
Generally the charge of the parallel plate capacitor is mathematically represented as
=>
Here , A and V are constant , so looking at the question we see that Q varies inversely with d
So
Here K is a constant
so
=>
=>
=>
So we see from the mathematically relation that the charge of the parallel plate capacitor will reduce by half of it original value