Physics

Physics, 22.11.2019 01:31, tfhdg

Bianca is standing at x =600m. firecracker 1, at the origin, and firecracker 2, at x =900m, explode simultaneously. the flash from firecracker 1 reaches bianca's eye at 4.0 μs . part a at what time does she see the flash from firecracker 2?

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Physics, 13.11.2019 02:31, Rperez6491

Apyrotechnical releases a 3 kg firecracker from rest. at t=0.4 s, the firecracker is moving downward with a speed 4 m/s. at the same instant the firecracker begins to explode into two pieces, "top" and "bottom", with masses mtop = 1 kg and mbottom=2 kg. at the end of the explosion (t = 0.6 s), the top piece is moving upward with speed 6 m/s the mass of the explosive substance is negligible in comparison to the mass of the two pieces. a) determine the magnitude of the net force on the firecracker system before the explosion. (use g=10). explain. i said f=m*a=(3)(10)= 30n b) determine the magnitude of the net force on the firecracker system during the explosion. i said the net force would still be 30 n but i'm not sure. c) determine the magnitude and reaction of the net impulse on the firecracker system during the explosion (from t=0.4 to t=0.6). explain. i did p=m*v=(30)(0.2)=6 but i'm not sure if this is right d) use the impulse momentum theorem to determine the change in magnitude and direction of momentum of the firecracker system during the explosion. draw a vector diagram for initial, change, and final momentum of the top, bottom, and system as a whole.

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Bianca is standing at x =600m. firecracker 1, at the origin, and firecracker 2, at x =900m, explode...

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