a 1kg object is explodes and breaks up in to three pieces .one piece has a mass of 400g and has velocity of (15i + 10j )m/s. a second pieces has a mass of 250g and has a velocity of ( 25i - 10j )m/s what is the velocity of the third piece?

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.