The mechanical energy of an isolated system is conserved...   only in elastic collisions.      only in inelastic collisions.      only in completely inelastic collisions.      in both elastic and inelastic collisions.

The US 16” MK 7 naval gun fires a 1225 Kg shell at a muzzle velocity of 760 m/s. The mass of the gun and breech is 121 500 Kg. Assume the gun is fired horizontally. a)  What is the recoil speed of the gun? b)  What are the final kinetic energies of the gun and shell? c)  The recoil is damped by a combination of springs and hydraulic cylinders that can be modeled as one large spring as shown below. If the recoil distance is 1.12 m, what is the spring constant of the damping system?

Why is energy conserved in an elastic collision but not in an inelastic collision?

(d) In terms of the impulse-momentum theorem, describe the underlying physics in the benefit of built in automotive crumple zones in medium speed collisions. (e) What is the difference between an elastic and an inelastic collision?

Answer question 8

In a paragraph could you explain in your own words, how you would distinguish Inelasticcollision, elastic collision and perfectly inelastic collisions?

7. Two objects have an elastic collision. Before the collision they approach one another with a velocity of 45 m/s. With what speed will they be separating after the collision?

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1) The US 16" MK 7 naval gun fires a 1225 kg shell at a muzzle velocity of 760 m/s. The mass of the gun and breech is 121 500 kg. Assume the gun is fired horizontally. a) What is the recoil speed of the gun? b) What are the final kinetic energies of the gun and shell? c) The recoil is damped by a combination of springs and hydraulic cylinders that can be modeled as one large spring as shown below. If the recoil distance is 1.12 m, what is the spring constant of the damping system? 1.12 m Recoil

[wo carts are on a flat track. Cart 1 is rolling forward at 2.5m/s. It impacts a stationary cart 2. After the collision, the two carts are stuck together. Is his collision, elastic, inelastic, or perfectly inelastic? a Inelastic b Perfectly Inelastic C Elastic