HW7 (Unit 4) Begin Date: 9/19/2017 12:00:00 AM-Due Date: 9/26/2017 11:59:00 PM E
ID: 1658325 • Letter: H
Question
HW7 (Unit 4) Begin Date: 9/19/2017 12:00:00 AM-Due Date: 9/26/2017 11:59:00 PM End Date: 12/14/2017 11:59:00 PM (1796) Problem 6: A round with a mass ofm-12 g is fired out of a rifle that has length L in the barrel. 1.08 m. The round spends-0.19s 33% Part (a) Write an expression, tn terms of the given quantities, for the magnitude of the round's acceleration, a, as it travels the rifle's barrel You may assume the acceleration is constant throughout the motion. Grade Sum Deductions Potential Submissions Attempts ren (2% per atte 1 2 3 etailed vies rm Submit Hint I give up Hints: 0% deduction per hint Hints remaining:- Feedback: 0% deduction per feedback. 33% Part (b) Calculate the numerical value for the magnitude of the round's acceleration, a in m/ 33% Part (c) What is the numerical value of the net force FNET in newtons acting on the round?Explanation / Answer
a) a = 2L/t²
b)
a = 2L/t²
= (2*1.08)/(0.19)^2
= 60 m/s^2
c) Fnet = m*a
= 0.012*a
= 0.012*60
= 0.72 N
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