Consider a hot air balloon floating 3000 m above the ground. If the basket has a mass of 80 kg, and the mass of the people flying it totals 375 kg, what is the potential energy of the hot air balloon basket? A.) 109,200,000 J
B.) 90,000,000 J
C.) 13,377,000 J
D.) 3.14 J

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

What does the law of conservation of mass state?

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)