Physics, 15.07.2019 21:30 soupsah7304
Why does a hot-air balloon rise? the weight of the balloon is less than the weight of the air displaced by the balloon. the weight of the air displaced by the balloon is less than the volume of the balloon. the volume of the air displaced by the balloon is less than the volume of the balloon.
Answers: 1
Physics, 22.06.2019 06:30
Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)
Answers: 1
Physics, 22.06.2019 12:20
Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.
Answers: 2
Physics, 22.06.2019 13:30
The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?
Answers: 1
Physics, 22.06.2019 19:00
What is the gravitational attraction between a dating couple whose centers of mass are 0.630 m apart if the boy weighs 715 n and the girl weighs 465 n?
Answers: 3
Why does a hot-air balloon rise? the weight of the balloon is less than the weight of the air disp...
Mathematics, 03.05.2021 21:10
Mathematics, 03.05.2021 21:10
Mathematics, 03.05.2021 21:10
Mathematics, 03.05.2021 21:10
Health, 03.05.2021 21:10
Social Studies, 03.05.2021 21:10
Mathematics, 03.05.2021 21:10
Mathematics, 03.05.2021 21:10