Ask Question
9 October, 03:41

Your car has stalled and you need to push it. You notice as the car gets going that you need less and less force to keep it going. Suppose that for the first 15 m your force decreased at a constant rate from 210 N to 45 N. How much work did you do on the car?

+4
Answers (1)
  1. 9 October, 04:01
    0
    675 Joules

    Explanation:

    Considering that work can be calculated with the following formula:

    W = Fx D

    Where:

    W = work

    F = force

    D = distance

    We can directly use this formula in case the applied force remains constant

    In case the force does not remain constant, we can calculate the work as a change, this is:

    ΔW = ΔFxΔD

    For this scenario, we have:

    W₁ = F₁xD₁

    F₁ = 210 N, D = 0 m

    W₁ = 210Nx0m = 0 Joules

    W₂ = F₂xD₂

    F₂ = 45 N, D₂ = 15 m

    W₂ = 45Nx15m = 675 Joules

    Finally: ΔW = Total work performed when moving the car 15 m

    ΔW = W₂ - W₁ = 675 Joules - 0 Joules = 675 Joules
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “Your car has stalled and you need to push it. You notice as the car gets going that you need less and less force to keep it going. Suppose ...” in 📗 Physics if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers