![subject](/tpl/images/cats/fizika.png)
Physics, 11.10.2019 04:00 averyrogerss560
In a rocket-propulsion problem the mass is variable. another such problem is a raindrop falling through a cloud of small water droplets. some of these small droplets adhere to the raindrop, thereby increasing its mass as it falls. the force on the raindrop is
fext=dpdt=mdvdt+vdmdt
suppose the mass of the raindrop depends on the distance x that it has fallen. then m=kx, wherek is a constant, and dm/dt=kv. this gives, since fext=mg,
mg=mdvdt+v(kv)
or, dividing by k,
xg=xdvdt+v2
this is a differential equation that has a solution of the form v=at, where a is the acceleration and is constant. take the initial velocity of the raindrop to be zero.
a) using the proposed solution for v, find the acceleration a.
b) find the distance the raindrop has fallen in
t = 2.00s .
c) given that
k = 2.00g/m , find the mass of the raindrop at t = 2.00s
![ansver](/tpl/images/cats/User.png)
Answers: 3
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Physics
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 00:30
Imagine you work as a consultant, and your daily job involves listening to the constructive criticism of others. as part of your job, you must listen to opposing viewpoints to make important decisions. in this activity, you are a consulting dam engineer. you must make a decision about four different dams; should they be repaired, taken down, or left alone? you will listen to contrasting opinions about what should be done with the dams before you make the final decision. as the consulting dam engineer, what do you decide to do with this dam? explain your reasoning. by making your decision, did you support the opinions of the mayor and/or the dam safety official? why or why not? (site 1)
Answers: 1
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/fizika.png)
Physics, 23.06.2019 04:31
Describe the three ray tracing steps used to identify an image for the given situation.
Answers: 1
![question](/tpl/images/cats/fizika.png)
Physics, 23.06.2019 12:30
Wich of yhe following is true a mass drpendent on gravity and weight is dependent on gravity b mass is not dependent on gravity and weight is dependent on gravity c mass is not dependent on gravity and wight is dependent on gravity d mass is dependent on gravity and weight is not dependent on gravity
Answers: 2
You know the right answer?
In a rocket-propulsion problem the mass is variable. another such problem is a raindrop falling thro...
Questions
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 05.06.2020 07:57
![question](/tpl/images/cats/mat.png)
Mathematics, 05.06.2020 07:57
![question](/tpl/images/cats/istoriya.png)
History, 05.06.2020 07:57
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 05.06.2020 07:57
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/istoriya.png)
History, 05.06.2020 07:57
![question](/tpl/images/cats/mat.png)
Mathematics, 05.06.2020 07:57
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 05.06.2020 07:57
![question](/tpl/images/cats/mat.png)
Mathematics, 05.06.2020 07:57
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 05.06.2020 07:57
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 05.06.2020 07:57
![question](/tpl/images/cats/User.png)
Engineering, 05.06.2020 07:57
![question](/tpl/images/cats/biologiya.png)
Biology, 05.06.2020 07:57
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 05.06.2020 07:57