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What is the definition of an “empty calorie”?
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- Which of the following equations is true for calorimetry? qA + qB = 1 qAqB = 0 qA = - qB qA - qB = 0"Room temperature” is generally defined in physics to be 25 °C. (a) What is room temperature in °F ? (b) What is it in K?Carrie is trying to figure out the number of calories in a cube of cheese. To do this, she pours 166.2 mL of water into an aluminum can suspended from a ring stand. She takes the temperature of the water, and finds it to be 19.1 degrees Celsius. Then, she places the 5.23 gram cube of cheese under the can and lights it on fire! While the cheese is burning and for a few minutes after it is done, Carrie records the temperature of the water, finding that it levels out at 45.4 degrees Celsius. How many calories of heat were gained by the water? Please answer to the nearest 0.1 calorie.
- At a power plant that produces 1 GW (109 watts) of electricity, the steam turbines take in steam at a temperature of 500°C, and the waste heat is expelled into the environment at 20°C. Suppose you develop a new material for making pipes and turbines, which allows the maximum steam temperature to be raised to 600°C. Roughly how much money can you make in a year by installing your improved hardware, if you sell the additional electricity for 5 cents per kilowatt-hour? (Assume that the amount of fuel consumed at the plant is unchanged.)Hi please help: A balloon contains 3.7 liters of nitrogen gas at a temperature of 86 K and a pressure of 101 kPa If the temperature of the gas is allowed to increase to 20.0 degrees Celsius and the pressure remains constant, what volume will the gas occupy? Express answer using two significant figuresA 355mL cup of hot chocolate has an initial temperature of 49°C. How many Calories of thermal energywill the liquid exchange if the drinker’s body temperature is 37°C? Assume hot chocolate is basicallywater. ??2? = 1???/??°C
- What is the value of the specific heat of glass in kcal/(kg . °C) if 1 kg of glass absorbs 16 kcal when its temperature is raised from 22 to 30 °C? Express the result as the product of two factors, where one of them is 10-2. Write the other factor in the crossword puzzle.A student constructs a simple constant volume gas thermometer and calibrates it using the boiling point of water, 100°C, and the freezing point of a specific brine solution, -21°C. The pressures measured at the calibration points are 1.366 atm and 0.9267 atm, respectively. From these data, what temperature will the student calculate, in degrees Celsius, for the value of absolute zero? T =The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount of heat transfer is measured. How many kilocalories per gram are there in a 4.9-g peanut if the energy from burning it is transferred to 0.48 kg of water held in a 0.095-kg aluminum cup, causing a 54.9degree celsius temperature increase?
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