A group of physics students heat a vial of water, which has a balloon at the top that traps the water vapor and air. Describe how much the internal energy is changed by, if the students are adding heat to the water via a Bunsen burner. No need to calculate anything.

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.