A student is trying to decide what to wear. His bedroom is at 20.0 °C. His skin temperature is 35.0 °C. The area of his exposed skin is 1.50 m².People all over the world have skin that is dark in the infrared, with emissivity about 0.900.Find the net energy transfer from his body by radiation in 10.0 min.

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?