When two liquids are mixed in an endothermic reaction, what always happens to the temperature of the solution? a. it gets warmer. b. it cools off until it freezes. c. it heats up until it boils. d. it gets colder.

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.