A hot-air balloon must be designed to support basket, cords, and one person for a total weight of 1300 N. The balloon material has a mass of 60 g/m2. Ambient air is at 25oC at 1 atm. The hot air inside the balloon is at 70oC and 1 atm. What diameter spherical balloon will just support the total weight

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.

Water flows through a garden hose which is attached to a nozzle. the water flows through hose with a speed of 2.19 m/s and through the nozzle with a speed of 19.8 m/s. calculate the maximum height (in m) to which water could be squirted if it emerges from the nozzle and emerges with the nozzle removed.