a. A pure ethanol-burning internal combustion engine contains 0.0710 kg of ethanol vapor in one cylinder, which burning raises the temperature of 25.0 kg of water by 18.2 C. What massof water inkilogramswill 0.125 kg of burning ethanol raise the temperature of the water by 25.0 C ?

b. If a weight attached to a paddle wheel in oil falls due to gravity and the 237.1 J of work done by the falling weight is transferred to the oil [use water's specific heat = 2269 J/(kg K)] with nearly no loss to other forms of energy, how many kelvin of temperature does the work done by the fall raise 4.568 kg of oil?

Be careful to track all significant digits and not round until the final answer.

c. Skateboardingagainst the wind and coasting for a moment, a 78.2-kg skateboarder slows from 9 to 7 m/s. How much work injoules does the wind do on the skateboarder?

(Note: The answer should be negative since the skateboarder slows down)