In an elastic collision, what happens to the change in kinetic energy? a) it is transformed into heat and also used to deform colliding objects. b) it is converted into potential energy. c) it is transformed into momentum such that momentum is conserved. d) all of the above. e) none of the above.

Explanation:

There are two types of collision. First one is elastic and other one is inelastic collision.

The linear momentum of two objects before and after the collision remains the same in case of elastic collision. Also, the kinetic energy in elastic collision is conserved. But in case of inelastic collision, the momentum of two objects before and after the collision remains constant but the kinetic energy is in conversed. It changes form one form of energy to another.

Hence, the correct option is (E) "None of the above".

Complete Question

Two parallel circular plates with radius 7 mm carrying equal -magnitude surface charge densities of ± 3.0μC/m2 are separated by a distance of 1 mm. How much stored energy do the plates have?  (ε0 = 8.85 × 10-12 C2/N ∙ m2)

a. 7.9 nJ     b. 25 nJ    c. 78 nJ     d. 250 nJ

The energy stored in the plate is 78 nJ

Explanation:

From the question we are given that

            The radius is  7 mm  

            The surface charge density

            The distance between the plates as d =  1mm

Generally the formula for energy stored in a capacitor is mathematically given as

Where A is the area  which is mathematically

                                                   =

 Substituting values into the equation we have