Asmall rubber ball is launched by a compressed-air cannon from ground level with an initial speed of 11.8 m/s directly upward. choose upward as the positive direction in your analysis. what is the maximum height above the ground that the ball reaches? how long does it take to reach the maximum height? how long does it take to reach the ground after it reaches its highest point? what is its velocity just before it hits the ground? (indicate the direction with the sign of your answer.)

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question

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.

Which planets are visible without a telescope