Many species cool themselves by sweating, because as the sweat evaporates, heat is transferred to the surroundings. a human exercising strenuously has an evaporative heat loss rate of about 657 w. if a person exercises strenuously for 28.6 min, how much water must he drink to replenish his fluid loss? the heat of vaporization of water is 2430 j/g at normal skin temperature.

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?