1.A sandbag is dropped vertically from a balloon which is ascending at a constant speed of 6m/s. If the bag is released with the same upward velocity of 6m/s when t=0 and hits the ground when t-8 seconds, determine the speed of the bag as it hit the ground and altitude of the balloon at this instant (t=8s).
2.How many watts of power would it take to heat 1 L of water(weighing 1.0 kg) by 10 degrees Celsius n 1.0 h? Assume no heat losses occur, so all of the energy expneded goes into heating the water.
3.When would you be likely to use a descriptive model of the design process? when would you use a prescriptive model?