Temperatura finală a unei bucăți de gheață, ce are inițial t1 = -10°C și masa m = 800 g, care primește căldura Q = 368,42 kJ este aproximativ: (Se cunosc ca = 4180 J/ kg·K, cg = 2090 J/ kg·K, λg = 335 kJ/kg).

Which best represents the law of conservation of mass ?

Astone is thrown with a speed v0 and returns to earth, as the drawing shows. ignore friction and air resistance, and consider the initial and final locations of the stone. which one of the following correctly describes the change δpe in the gravitational potential energy and the change δke in the kinetic energy of the stone as it moves from its initial to its final location? options a.δpe = 0 j and δke = 0 j b.δpe is positive and δke is negative c.δpe = 0 j and δke is positive d.δpe is negative and δke is positive e.δpe = 0 j and δke is negative

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions