Indigenous people sometimes cook in watertight baskets by placing hot rocks into water to bring it to a boil. what mass of 500ºc rock must be placed in 4.00 kg of 15.0ºc water to bring its temperature to 100ºc, if 0.0250 kg of water escapes as vapor from the initial sizzle? you may neglect the effects of the surroundings and take the average specific heat of the rocks to be that of granite. (answer in kg)

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.