A block resting at the top of a rough ramp with coefficients of kinetic and static friction of 0.20 and .40 respectively. The angle of the ramp gradually increased until the block just begins to slip. Calculate the angle that the block begins to slip.

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

What is an aquifer for science class

To place a communications satellite into a geosynchronous orbit at an altitude of 22,240 mi above the surface of the earth, the satellite first is released from a space shuttle , which is in a circular orbit at an altitude of 185 mi, and then is propelled by an upper-stage booster to its final altitude. as the satellite passes through a, the booster's motor is fired to insert the satellite into an elliptic transfer orbit. the booster is again fired at b to insert the satellite into a geosynchronous orbit. knowing that the second firing increases the speed of the satellite by 4810ft/s, determine (a.) the speed of the satellite as it approaches b on the elliptic transfer orbit, (b.) the increase in speed resulting from the first firing at a.