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26-10-2022
Physics

Answered

A student rides a burlap sack down a slide at the state fair. She starts at rest at the top of the slide. At the bottom of the slide, she notices that the burlap sack is warmer than when she started. Which equation below models the energy of the burlap sack at the top (position 1) and bottom (position 2) of the hill? E_th is thermal energy.

a. ½mv²₁ = mgh₂ + E_th

b. mgh₁ = ½mv²₂ + E_th

c. ½mv²₁ + E_th = mgh₂

d. mgh₁ + E_th = mgh₂

Answer :

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