A 134.0 g sample of an unknown metal is heated to 91.0°C and then placed in 125 mL of water at 25.0°C. The final temperature of the water is measured at 31.0°C. Calculate the specific heat capacity of the unknown metal.

12 Assume Lake Huron contains 3.60 x 10-2 m³ of water, and assume the water's density is that of water at 20°C and 1 atm. (a) How much energy (in J) is required to raise the temperature of that volume of water from 12.8°C to 23.6°C? 1.627e24 From the density of water and the volume, what is the mass of the water? What is specific heat? How is it related to the energy input, mass, and temperature change? Use it to solve for the energy. Be careful with units. J (b) How many years would it take to supply this amount of energy by using a power of 1,400 MW generated by an electric power plant? yr

0.0550 kg piece of glass is heated to an unknown temperature and dropped into a calorimeter containing 0.150 kg of water at 12.0 °C. The glass and the water reach a final temperature of 18.0 °C. What is the initial temperature of the glass?

In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction. Thermometer Stirring rod A student heats 63.43 grams of silver to 98.37 °C and then drops it into a cup containing 83.30 grams of water at 20.64 °C. She measures the final temperature to be 23.73 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.88 J/°C. Water Assuming that no heat is lost to the surroundings calculate the specific heat of silver. Metal sample Specific Heat (Ag) = J/g°C. 2000 Thomson-Brooks/Cole

A 12 m by 4.2 m concrete wall has the thickness 8.2 cm. Find the heating rate through this wall if one side of the wall is at 36 C and the other side is at 28°C. The thermal conductivity of this concrete wall is 1.0 W/m-K.

P2

A coin that is tossed straight up into the air. After it is released, it moves upward, reaches its highest point and falls back down again. Use one of the following choices (A through G) to indicate the acceleration of the coin during each of the stages of the coin's motion described below. Take up to be the positive direction. Answer choice J if you think that none is correct. A. The acceleration is in the negative direction and constant. B. The acceleration is in the negative direction and increasing. C. The acceleration is in the negative direction and decreasing. D. The acceleration is zero. E. The acceleration is in the positive direction and constant. F. The acceleration is in the positive direction and increasing. G. The acceleration is in the positive direction and decreasing. The coin is mo downward. OE OF OJ O C O A OD OG O B

Each of the following vectors is given in terms of its xx- and yy-components.

The temperature of a 63 g sample of an unknown substance is raised from 28° C to 86° C when 390 calories of heat are added . What is the specific heat of the sample , in cal/g . C ? Enter your calculated value to the nearest .001 cal/g . C .

19. The following fission reaction (shown below) occurs in a nuclear power plant. There are 1.50 x 1016 uranium-235 atoms that are simultaneously undergoing this reaction. The uranium is surrounded by 17.5 kg of heavy water, which has a specific heat capacity of 4.70 x 10³ J/kg °C. If 90% of the energy released in the nuclear reactions is absorbed as thermal energy by the heavy water, determine the increase in temperature of he heavy water. ✔✔✔✔ 235U+n→ Zr + 139 Te + 3(n) 92 40 52 mzr-94 = 93.906 u MTe-139 = 138.935 u Mu-235 = 235.044 u