Experiments have shown that, for airflow at = 35°c and = 100 m/s, the rate of heat transfer ∞1 from a turbine blade of characteristic length l1 = 0.15 m and surface temperature = 300°c is =1500 w. what would be the heat transfer rate from a second turbine blade of characteristic length l2 = 0.3 m operating at = 400°c in airflow of = 35°c and v2 = 50 m/s? the surface area of the ∞ blade may be assumed to be directly proportional to its characteristic length.

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?