Aboxcar of length 8.00 m and height 2.40 m is at rest on frictionless rails. the empty boxcar has a mass of 3800 kg. inside the boxcar, located at the left end, is a tank containing 1450 kg of water. the tank is 1.90 m long and 2.40 m tall. the tank starts to leak, and the water fills the floor of the boxcar uniformly. assume that all the water stays in the box car. after all the water has leaked out of the tank, what will be the final velocity of the boxcar?

The final velocity of the boxcar will be zero meter per seconds .

Explanation: Since tank of water is inside the boxcar so when the water leaks from tank the force on the boxcar due to leaking water is internal . Thus the net external force on the boxcar-tank system is zero .

Therefore momentum of the system of boxcar-tank will be conserved .

final momentum of the system=Initial momentum of system

=>

=>

Since

Therefore ,

Thus final velocity of the boxcar will be zero m/s .

fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.