In the room, on a table with a height of h1 = 75 cm, there is a thin metal plate with a mass of m = 0.4 kg. What is the potential energy of the plate relative to the surface of a) floor b) table c) ceiling? Room height h2 = 3m.
Task data: h1 (table height) = 75 cm = 0.75 m; m (weight of a thin plate) = 0.4 kg; h2 (room height) = 3 m.
Constants: g (acceleration due to gravity) ≈ 10 m / s2.
1) Floor surface: Ep1 = m * g * h1 = 0.4 * 10 * 0.75 = 3 J.
2) Table surface: Ep0 = m * g * h0 = 0.4 * 10 * 0 = 0 J.
3) Ceiling surface: Ep2 = m * g * (h1 – h2) = 0.4 * 10 * (0.75 – 3) = -9 J (potential pit).
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