A home run is hit in such a way that the baseball just clears a wall 21 high, located 130m from home plate. The ball is hit at an angle of 35° to the horizontal and air resistance is negligible. Find (a) the inital speed of the ball (b) the time it takes the ball to reach the wall (c) the velocity components and the speed of the ball when it reaches the ball. ( Assume the ball is hit at a height of 1.0m above the ground).

Electroplating is a way to coat a complex metal object with a very thin (and hence inexpensive) layer of a precious metal, such as silver or gold. in essence the metal object is made the cathode of an electrolytic cell in which the precious metal cations are dissolved in aqueous solution. suppose a current of 480.ma is passed through an electroplating cell with an aqueous solution of agno3 in the cathode compartment for 46.0 seconds. calculate the mass of pure silver deposited on a metal object made into the cathode of the cell. round your answer to 3 significant digits. also, be sure your answer contains a unit symbol. ×10μ

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?

If element x has 99 protons how many electrons does it have