A pressure switch is used in a washing machine to control the flow of water. The water pushes on a flexible container and compresses some trapped air. When the pressure of this trapped air reacher 104 kPa, the pressure switch turns the water off. The pressure of the trapped air is given by this relationship: pressure of the trapped air - atmospheric pressure + pressure difference caused by the water. Calculate the height of water in the machine when the pressurre of the trapped air reaches to 104 kPa and the switch operates. (atmospheric pressure = 100 kPa, density of water = 1000 kg/m^3)

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?