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giusto1073
30.10.2019 •
Physics
Afreight car of mass m contains a mass of sand m. at t = 0 a constant horizontal force f is applied in the direction of rolling and at the same time a port in the bottom is opened to let the sand flow out at constant rate dm/dt. find the speed of the freight car when all the sand is gone. assume the freight car is at rest at t = 0.
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Ответ:
Amount of linear movement
Explanation:
Our system is defined by the rate of change in mass that
leaves the car
, this happens during a time interval
In this way we need to define the two states:
State 1,
consider
and V.
State 2,
consider![t + \Delta t, m_ {c} (t), V + V \Delta V](/tpl/images/0352/2646/f0bee.png)
In this state is the mass of sand output, which
is composed of
In this way we define the Linear movement in x, like this:
In this way we proceed to obtain the Force
Since the mass of the second term becomes 0, the same term is eliminated, thus,
Ответ:
312.5
Explanation:
we know that
s= ut + 1/2 at^2
= 0*5+1/2*25*5^2
= 0+ 625/2
=312.5
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