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December 20, 2014

December 20, 2014

Posted by **Chad** on Tuesday, August 7, 2012 at 4:43pm.

pieces. A 1.0 kg chunk lands 15.0 m away, 45

O

due northeast from the launch site. A second 1.0

kg piece lands 25.0 m, 60

O

south of east from the launch site. If all 3 pieces land at the same time

on the (level) ground, where does the third piece land?

- Physics -
**Elena**, Wednesday, August 8, 2012 at 10:54amSince the shell was at the highest point, its velocity=0. The chunks moved in horizontal plane. Actually, each velocity is horizontal velocity, therefore, these are the velocities of uniform motions.

v1•t=s1=15, v2•t=s2=25 => v1=0.6•v2,

p1=m1•v1 =m1•0.6•v2,

p2=m2•v2

Taking into account the directions of the chunks motions, let’s find the vecor sum of p1 and p2. The angle that p1 and p2 make is 45+60=105º, => (360 - 2•105) =75º. Using the cosine law,

p12= sqrt{p1²+p2²-2p1•p2•cosα} =

=sqrt{ {(m1•0.6•v2)² +(m2•v2)² -2m1•m2•v2•0.6•v2•cos75º}.

||m1=m2||

p12= m2•v2•sqrt{0.6²+1 - 2•0.6•0.26} =1.02•m2•v2

According to the law of conservation of linear momentum

p3 = p12

p3=m3•v3 =>

m3•v3 =1.02•m2•v2,

v3=1.02•m2•v2/m3

since m2=1 kg, m3=5-1-1=3 kg,

v2=25/t

v3= =1.02•1•v2/3=1.02•25/3•t.

s3=v3•t= 1.02•25•t/3•t=1.02•25/3=8.5 m

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