First Law of Thermodynamics Video Lessons

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Problem: A skater pushes straight away from a wall. She pushes on the wall with a force whose magnitude is F, so the wall pushes on her with a force F (in the direction of her motion). As she moves away from the wall, her center of mass moves a distance d. Consider the following statements regarding energy. I ΔKtrans + ΔEinternal = Fd II. ΔKtrans + ΔEinternal = −Fd III. ΔKtrans + ΔEinternal = 0 IV. ΔKtrans = Fd V. ΔKtrans = −Fd What is the correct form of the energy principle for the skater as a real system and as a point particle (PP) system? 1. Real: II, PP: V 2. Real: I, PP: V 3. Real: II, PP: IV 4. Real: V, PP: I 5. Real: IV, PP: III 6. Real: III, PP: IV 7. Real: V, PP: IV 8. Real: I, PP: IV 9. Real: III, PP: V 10. Real: IV, PP: IV

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Problem Details

A skater pushes straight away from a wall. She pushes on the wall with a force whose magnitude is F, so the wall pushes on her with a force F (in the direction of her motion). As she moves away from the wall, her center of mass moves a distance d. Consider the following statements regarding energy.

I ΔKtrans + ΔEinternal = Fd
II. ΔKtrans + ΔEinternal = −Fd
III. ΔKtrans + ΔEinternal = 0
IV. ΔKtrans = Fd
V. ΔKtrans = −Fd

What is the correct form of the energy principle for the skater as a real system and as a point particle (PP) system?

1. Real: II, PP: V
2. Real: I, PP: V
3. Real: II, PP: IV
4. Real: V, PP: I
5. Real: IV, PP: III
6. Real: III, PP: IV
7. Real: V, PP: IV
8. Real: I, PP: IV
9. Real: III, PP: V
10. Real: IV, PP: IV

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Our tutors have indicated that to solve this problem you will need to apply the First Law of Thermodynamics concept. You can view video lessons to learn First Law of Thermodynamics. Or if you need more First Law of Thermodynamics practice, you can also practice First Law of Thermodynamics practice problems.

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Based on our data, we think this problem is relevant for Professor Hirsch's class at PURDUE.