Two substances, a and b, initially at different temperatures, come into contact and reach thermal equilibrium. the mass of substance a is 6.42 g and its initial temperature is 20.7 oc. the mass of substance b is 26 g and its initial temperature is 52.5 oc. the final temperature of both substances at thermal equilibrium is 46.1 oc. if the specific heat capacity of substance b is 1.17 j/gâoc, what is the specific heat capacity of substance a?

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