Calculate the heat that must be supplied to raise the temperature of 2 kg of water from 25∘25∘C to its boiling point at atmospheric pressure.The average specific heat of water in the range 25−100∘C25-100∘C is 4.184 J K−1g−1K-1g-1. (b)How long will a 2 kW heater take to supply this energy?

The human body, while at rest, produces heat energy at a rate of about 100 W. How much sweat (in g) must evaporate every minute from their skin to carry away this excess energy? (Note according to your book, the latent heat of vaporization of water at body temperature is 2.43 * 106 J/kg).

In the laboratory, calorimetry can be used to determine the latent heat of fusion of water, LfLf. If an ice cube of mass 30.0g30.0g at 0∘C0∘C is added to a calorimeter cup of mass mc=60.0gmc=60.0g that contains water of mass 170g170g at an initial temperature TiwTiw of 20∘C20∘C, after the ice melts, the final temperature of the water TfwTfw is found to be 5.57∘C5.57∘C. Based on this data, what is the latent heat of fusion of water? The specific heat capacities of water and the calorimeter are  4186J/(kg.K)4186J/(kg.K) and 900J/(kg.K)900J/(kg.K),  respectively

To what temperature will 7900 J of heat raise 2.5 kg of water that is initially at 16.0 ∘C? The specific heat of water is 4186 J/kg⋅C∘.

To what temperature will 9100 J of heat raise 3.0gkg of water that is initially at 15.0 ∘C? The specific heat of water is 4186 J/kg⋅C∘. Express your answer using three significant figures.

Water with a mass of mW = 0.400 kg and temperature of TW = 18.5°C is poured into an insulated bucket containing mI = 0.11 kg of ice at a temperature of TI = -18°C. Assume the specific heats of ice and water are constant at cI = 2.10×103 J/(kg⋅°C) and cW = 4.19×103 J/(kg⋅°C), respectively. The latent heat of fusion for water is Lf = 334×103 J/kg. What is the final temperature of the mixture, in degrees Celsius?

An insulated beaker with negligible mass contains liquid water with a mass of 0.340 kg and a temperature of 60.0 ∘C. How much ice at a temperature of -10.4 ∘C must be dropped into the water so that the final temperature of the system will be 20.0 ∘C? Take the specific heat of liquid water to be 4190 J/kg⋅K , the specific heat of ice to be 2100 J/kg⋅K , and the heat of fusion for water to be 3.34×105 J/kg .

How long does it take a 750-WW coffeepot to bring to a boil 0.85 LL of water initially at 18 ∘C∘C? Assume that the part of the pot which is heated with the water is made of 360 gg of aluminum, and that no water boils away. Ignore the heat loss to the surrounding environment. The value of specific heat for water is 4186 J/kg⋅C∘J/kg⋅C∘ and for aluminum is 900 J/kg⋅C∘J/kg⋅C∘. Express your answer using two significant figures. In seconds

Compute the energy consumption in units of joules per year, gigawatts (GW), and watts per person as (a) fuel, (b) food, and (c) solar radiation for a country of population density 20 person/km2, an area of 1 million km2, and a fuel energy consumption rate of 250 GJ per person per year. Solar radiation reaching the ground is approximately 150 W/m2. The average person consumes food containing 2000 “calories” per day (1 calorie = 4182 J).

The specific heat of a certain steel is0.46 J·g−1·K−1 and the specific heat of a “dry” wood is 1.8 J·g−1·K−1. Suppose we add a given amount of energy as heat to 10.0-gram samples of the steel and wood. (a) Which sample will undergo the largest temperature increase? (b) Calculate the ratio of the temperature increase for the two samples. answer: (a) steel, (b) 3.9 = steel/wood