Bookmarks People Window Help 97% Rg. Mon 1:06 PM MasteringPhysics: Ch 08 HW Part

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Bookmarks People Window Help 97% Rg. Mon 1:06 PM MasteringPhysics: Ch 08 HW Part 2 e Secure https://session.masteringphysics.com/myct/itemView?offset=next&assignmentProblemID;=78596464 Ch 08 HW Part2 Problem 8.32 previous 3 of 10| nexd Problem 8.32 Part A The force exerted by expanding gases is what propels a shell out of a gun barrel. Suppose a force that has an average magnitude F propels the shel so that it has a speed v at the instant it reaches the end of the barrel. What magnitude force is required to double the speed of the anell in the same gun? Express your answer in terms of some or all of the variables F and . Submit My Answers Give Up

Explanation / Answer

v^2 =2ad
where
v is the final velocity,
the initial velocity = 0
a = acceleration
d = length of the barrel
hence a = v^2/(2d)
F_1 = ma_1 = m*(v_1)^2/2d
F_2 = ma_2 = m*(2*v_1)^2/2d = 4*m*(v_1)^2/2d
F_2/F_1 = 4
so, 4 times as much force.

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