(12%) Problem 3: A round with a mass of m = 15.5 g is fired out of a rifle that

Question

(12%) Problem 3: A round with a mass of m = 15.5 g is fired out of a rifle that has length L = 0.84 m. The round spends t = 014 s in the barrel 50% Part (a) Calculate the magnitude of the round's acceleration, in meters per second squared, as it travels through the rifle's barrel. You may assume the acceleration is constant throughout the motion Grade Summary Deductions Potential 0% 100% Submissions cos) cotan0 asinacos0 sin tan Attempts remaining: 10 (1% per attempt) detailed view atan()a coshO tanh0 acotan sinh( 12 3 cotanhO END Degrees Radians BACKSPACE DEL CLEAR Submit Hint I give up! Hints: 1 % deduction per hint. Hints remaining: 1 Feedback: 0% deduction per feedback 50% Part (b) What is the numerical value of the net force FNET in newtons acting on the round?

Explanation / Answer

a) a = 2x/t²
= (2*0.84)/(0.14)^2
= 85.7 m/s^2

b) Fnet = m*a
= 0.0155*85.7
= 1.33 N

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