The specific heat capacity of water is the amount of energy (in Joules) required to raise the temperature of 1 kg of water by 1 °C; for practical purposes, this is equal to J about 4186 kg C You put 0.5 L of water in a microwave oven. The water has a starting temperature of 4 °C. The microwave oven is rated at at 1,400 W and efficiency of 53%. If you run the microwave for 35 seconds, what is the temperature of the water when the microwave oven stops? Assume that the density of water is p=1 kg/L. Your Answer:

A woman expends 95 kJ of energy in walking a kilometer. The energy is supplied by the metabolic breakdown of food intake and has a 35 percent efficiency. If the woman drives a car over the same distance, how much energy is used if the car gets 8.8 km per liter of gasoline (approximately 20 mi/gal)? The density of gasoline is 0.71 g/mL, and its enthalpy of combustion is 49 kJ/g. Enter your answer in scientific notation.   Compare the efficiencies of the two processes.    kJ (driving)/ kJ (walking)

450g of water is heated in a pot from 22°C to 62°C. The water has a specific heat capacity of 4190 J/kg*K. What is the amount of thermal energy/heat transferred to the water to increase the temperature?

A fuel-efficient car is able to convert the chemical potential energy of gasoline into translational kinetic energy at an efficiency of 78.4%. If there is 8742 kJ of chemical potential energy in one tank of gas, what is the amount of translational kinetic energy produced. How to manipulate formula eff=output/input x 100

Geothermal energy uses the subsurface level of the earth to heat up water converting it to steam and then using the steam to turn a turbine attached to a generator to generate electric energy. If the geothermal energy conversion process is 46% efficient and there was 789 J of electricity produced, how much energy did the steam have before reaching the turbine? answer 1715 eff=output/inputx 100

A small electric immersion heater is used to heat 79 g of water for a cup of instant coffee. The heater is labeled “72 watts" (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 20°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg-K.) Number Units

Note: Round off your answer up to 3 decimal places.  Input only the numerical value. Researchers are conducting a study to quantity the thermal conductivity of a composite material. A square box is made from 838 cm2 sheets of the composite insulating material that is 2.8 cm thick. A 201 W heater is placed inside the box. Sensors attached to the box show that the interior and exterior surfaces of one face have reached the constant temperatures of 81°C and 38°C. What is the thermal conductivity in W/m-K?