1. a satellite of 842kg orbits the earth in a perfect circle at altitude 2.78x10⁶m. a) calculate the gravitational potential energy of the satellite. b) calculate the magnitude of the momentum of the satellite. Earth mass= 5.97x10²⁴kg, earth radius= 6.38x10⁶m, G is 6.67x10^-11Nm²/kg².

2. b) a car travelling clockwise around a circle at constant speed is currently located east of the circle's centre. What direction is the car's instantaneous acceleration? c) an electron is 5m west of +1C point charge and 5m south of a -1C point charge. In what direction is the electron's net electric force?

d) a proton is in a westwards magnetic field with a magnetic force upwards. What is the direction of the proton's velocity?

e) a conventional current flows in a wire upwards from the ground to the ceiling. What is the direction of the magnetic field west of the wire? i) a projectile is launched at an initial velocity of 74.8 m/s [25.1 above the horizontal]. At the maximum height, what is its instantaneous speed?

j) a projectile is launched at an initial velocity of 74.8 m/s [25.1 above the horizontal]. At the maximum height, what is its instantaneous acceleration? Include direction.