A cockroach alights and then sits motionless on a sandwich. The sandwich rests o

Question

A cockroach alights and then sits motionless on a sandwich. The sandwich rests on a plate. The plate is sitting on the book you are reading. Underneath the book is a napkin, which is on a tray, which inturn rests on a table. The cockroackes weight is 0.030N, the sandwich's weight is 3.45N, the weight of the plate is 6.00N, the book weighs 4.00N, the napkin weighs 0.12N, and the tray weighs 11.30N
Expain fully (including all important details as you go please), how you would go about determining the force that the tray has to be exerting on the napkin.

Explanation / Answer

when the cockroach alights and sits on the sandwich their is a impulsive force that acts on the sandwich. once the impulsive force is found then you can find other forces by just adding the weights of other substances which are kept on the table. If we assume the impulsive force to be zero then we can directly find the force Take the cockroach , sandwich , plate, book and napkin as one system and the tray as another. nowthe force exerted by tray = 0.30+3.45+6+4+.12=13.87N

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