Q4- EP6) Um guindaste eleva um piano de 250 kg até a altura de 20m/s em relação ao solo em um local onde g= 10m/s^2 Qual é a energia potencial gravitacional do piano nessa posição: a) em relação ao solo? b) em relação a um referencial equidistante entre o piano e solo?

<p> This is a standard physics question about gravitational potential energy. Potential energy describes the potential a physical system has to do work due to its positioning or configuration. In this case, the piano being raised by a crane gains potential energy as its height from the ground increases, as does the potential energy to perform work by falling to the ground due to Gravity's pull.<br /><br />Gravitational potential energy is calculated by the formula:<br /><br /> PE = m * g * h <br /><br />where <br />PE = potential energy <br />m = mass (in kg)<br />g = gravitational acceleration (in m/s^2)<br />h = height above ground (in m) <br /><br />The question asks you to calculate this potential energy in two different situations. <br />a) Relative to the ground. <br />b) Relative to a reference point equidistant between the ground and the piano, which places the piano at 10m above this reference point. In the latter case, the height h is halved, but the calculation is otherwise the same. <br /><br />Let's work through this.</p>