A Truck Full Of Birds
A large enclosed truck weighs 1000 pounds; the driver weighs 200 pounds and 100 birds inside the back of the truck each weighs 1 pound.
So, the truck weighs in at 1300 pounds.
Now if all the birds started flying at once in the back of the truck and the driver drives onto a weighing scale, what total weight will the scale report?
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1 solution
It is an enclosed system, so whatever the birds might be doing in the back, it won't effect the total weight of the system.