A11.0 g rifle bullet is fired with a speed of 380 m/s into a ballistic pendulum with mass 10.0 kg, suspended from a cord 70.0 cm long.
a) compute the vertical height through which the pendulum rises.(cm)
b) compute the initial kinetic energy of the bullet; (j)
c) compute the kinetic energy of the bullet and pendulum immediately after the bullet becomes embedded in the pendulum.(j)
answer; ///i do believe that the correct answer is; ////(continuity); //(d)
when neglecting air resistance or frictions, the mechanical energy of an object in motion is conserved.
mechanical energy is defined as the sum of potential energy (u) and kinetic energy (k):
at the highest point of its swing, the pendulum has only potential energy (because its motion has stopped), therefore its mechanical energy at the highest point is:
on the contrary, at the lowest point of its swing, the pendulum has only kinetic energy, because it is a its lowest height, so the potential energy is zero, and all the mechanical energy is just kinetic energy:
and since for the conservation of energy e must be conserved, we have
so, the kinetic energy at the bottom of its swing is 592 j.
using the law of conservation of energy
when two cars collide with each other then the momentum is same before collision and after collision but energy is changed after collision in form of heat and sound.
we know this collision is inelastic collision.
in inelastic collision, when two objects collide with each other then the momentum is conserved but kinetic energy is not conserved.