A small object is sliding along a level surface with negligible friction and has mass m, and constant speed v0 when it collides with a brick resting on the surface. If the object recoils backward at v03, and is in contact with the brick for time ∆t, assuming the force is constant, what force did the brick exert on the object? Assume the object is moving along the x-direction.

How many molecules are present in 3 mols of silicon dioxide (sio2)?

Aphysical change is a change in the size, shape,, or stafe of matter true or false

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)