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https:// session. masteringphysics.com next Copy of Homework assignments for General College Physics I HW Set 6 Problem 7.25 Problem 7.25 Part A lands with pinecone falls 16 m to the ground, where it A 0.16 kg a speed of 13 m/s How much work was done on the pinecone by air resistance? Express your answer using two significant figures. Submit My Answers Give Up Part B What was the average force of air resistance exerted on the pinecone? Express your answer using two significant figures. Submit My Answers Give Up Signed in as fahad alkaltham I Help I close Resources previous l 7 of 10 l next Provide Feedback Continue

Explanation / Answer

given:

mass of pine cone= m=0.16 kg

height of fall=h=16 m

so, potential energy lost= mgh =0.16 x 9.8 x 16= 25.088 j

it lands with a speed of 13m/s i.e. v= 13 m/s

so, kinetic energy gained = 1/2 * m * v^2= 1/2 * 0.16 * 13^2= 13. 52 j

So, work done by air resistance= 25.088 -13.52= 11.568 j

B. we know work done = force x distance

so,average force of air resistance = 11.568 /16=0.723 N

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