00:01
So in this question, we're told that we have a helicopter, and it's got a mass of m helicopter is 15 ,800 kilograms, and it's carrying some cargo with some weight w cargo.
00:27
And since the cargo is the earth is exerting this weight force on the cargo, that means by newton's third law, the cargo is exerting the same weight force on the earth.
00:41
Now the helicopter is exerting an upward force, an upward thrust of t equals 324 ,000 neutens, and that's causing an acceleration for the helicopter and its cargo of a equals 0 .4 meters per second squared.
01:03
So let's look at this system here.
01:07
So we have that the resultant force is the thrust minus the weight of the cargo, minus the weight of the helicopter, which is the mass of the helicopter times g.
01:19
And newton's second law tells us that this is equal to the mass of the helicopter plus the mass of the cargo, so the weight of the cargo divided by g, times by the acceleration...