A firecracker of mass M, initially at rest, explodes into two pieces. One piece of mass m moves to the left with a speed v. Write an expression for the speed of the other piece after the explosion.

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Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

Examine the equation. 23490th→23088ra+42he what kind of barrier would you need to block the radioactive particles from this reaction? a.a piece of paper b.a sheet of aluminum foil c. a two-inch block of lead d. a solid concrete block