Aballistic pendulum is a device for measuring bullet speeds. one of the simplest versions consists of a block of wood hanging from two long cords. (two cords are used so that the bottom face of the block remains parallel to the floor as the block swings upward.) a 9.4-g bullet is fired into a ballistic pendulum in which the block has an inertia of 5.5 kg , and the block rises 60 mm above its initial position. part awhat is the speed of the bullet just before it hits the block? part bhow much energy is dissipated in the collision?

A2-kg bowling ball is 2.5 meters off the ground on a post when it falls. just before it reaches the ground, it is traveling 7 m/s. assuming that there is no air resistance, which statement is true?

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

Need people build a dam to create a reservoir that supplies water a nearby city needs. describe two ways this action will likely affect the water cycle in the local environment. (5 points) worth 20 points