Question
Asked Mar 2, 2020
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A0.16 kg pinecone falls 18 m to the ground, where
it lands with a speed of 11 m/s.
Part A
How much work was done on the pinecone by air resistance?
Express your answer using two significant figures.
Πν ΑΣφ
J
Submit
Request Answer
Part B
What was the average force of air resistance exerted on the pinecone?
Express your answer using two significant figures.
Hνα ΑΣφ
|F| =
Submit
Request Answer
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A0.16 kg pinecone falls 18 m to the ground, where it lands with a speed of 11 m/s. Part A How much work was done on the pinecone by air resistance? Express your answer using two significant figures. Πν ΑΣφ J Submit Request Answer Part B What was the average force of air resistance exerted on the pinecone? Express your answer using two significant figures. Hνα ΑΣφ |F| = Submit Request Answer

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Expert Answer

Step 1

(A)

The work done on pinecone by air resistance is the difference in kinetic energies between pinecone under the influence of air resistance and not under air resistance.

 

 

Step 2

 

The total work done is equal to the work done due to gravity and work done by air resistance; according to work energy theorem the work done is equal to the change in kinetic energy.

 

Physics homework question answer, step 2, image 1

Substitute the values in equation (I).

Physics homework question answer, step 2, image 2

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