Question1
A particle is uncharged and is thrown perpendicularly upward from ground level with a speed of 23.7 m/s. As a consequence, it attains a most height h. The particle is then given a positive charge +q and reaches the same maximum height h when thrown vertically upward with a speed of 31.1 m/s. The electric potential at the height h exceeds the electric potential at ground level. At last, the particle is given a negative charge -q. ignoring air resistance; determine the speed with which negatively charged particle must be thrown vertically upward, so that it attains exactly the most height h. In all three situations, be sure to include the effect of gravity.
Question2
A crate, M= 394 kg, sits at rest on a surface that is inclined at 20 degrees above the horizontal. A horizontal force (parallel to the ground), 525 N is necessary to just start crate moving down an incline.
To the close thousandth, what is coefficient of static between the crate and the incline?