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Q: 4. You have 1 kg of water and you want to use that to melt 0.1 kg of ice. What is the minimum…
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Q: 10) An aluminum rod 17.400 cm long at 20°C is heated to 100°C. What is its new length? Aluminum has…
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Activity 2-6 part 2
Step by step
Solved in 2 steps
- One way to cool a gas is to let it expand. When a certain gas under a pressure of 5.00 106 Ha at 25.0C is allowed to expand to 3.00 times its original volume, its final pressure is 1.07 106 Pa. (a) What is the initial temperature of the gas in Kelvin? (b) What is the final temperature of the system? (See Section 10.4.)2. A balloon has a volume of 4.0 L when at sea level (1.0 atm) at a room temperature of 28°C What will be its volume when inflated with the same amount of gas at an elevation where the atmospheric pressure is 700 mm Hg at 28°C?4. A uniform bar with an area of o.25 in² is pulled between two points. The tensile force at a temperature of 21.11°C is 1200 lb. What will be the stress at -17.78°C? At what temperature will the stress be zero? Assume a = 6.5 x 10« in/(in-°F) and E = 29 x 10° psi.
- 2. At a pressure of 1 atm = 1.01 x 105 Pa, water boils at a temperature of 100° C. At what pressure will it boil at 115° C? The heat of vaporization of water in 539 kcal/kg = 22.6 x 105 J/kg, and we will assume this is constant. Two possibly useful numbers are R = 8.315 x 103 J/(kmole K) and 1 kmole of water 18 kg. =4. Large helium-filled balloons are used to lift scientific equipment to high altitude. What is the pressure inside such a balloon (in atm) if it starts out at sea level with a temperature of 24.8°C and rises to an altitude where its volume is eighteen times the original volume and its temperature is -35.7°C? 0.04432. A perfect gas has a value of R = 319.2 J/kg.K and k 1.26. If 120 kJ is added to 2.27 kg of this gas at constant pressure when initial temperature is 32.2 deg Celsius, find T2, AH, AU and W
- 1. A walrus transfers energy by conduction through its blubber at the rate of 165 W when immersed in -1 deg C water. The walrus's internal core temperature is 36.5 deg C, and it has a surface area of 2 m². What is the average thickness of its blubber, which has the conductivity of fatty tissues without blood (k=0.2 J/(s m °C))? d= cm2. Show that if the temperature on the Celsius scale changes by ATc, the Fahrenheit temperature changes by AT, = {ATc. 3. A solid substance has a density po at a temperature To. If its temperature is increased by an amount TA, show that its density at the higher temperature is given by Po 1+ BAT 4. A circular copper ring at 20.0°C has a hole with an area of 9.980 cm². (a) What minimum temperature must it have so that it can be slipped onto a steel rod having SO16. What is the amount of heat required to melt 100 g of ice completely at -10°C? (5) (a) 6048 cal _(b) 4680 cal (c) 8640 cal (d) 8064 cal 17 A 21 container holds 3 moles of N. at 323 K What is the pressure of the gas inside the container?
- 3. A closed vessel 6 litres in volume contains nitrogen (N2) at a temperature of 27° C and a pressure of 4 atm. After heating, the pressure in the vessel rose to 24 atm. Find : (1) the temperature of the nitrogen after heating, (2) the quantity of heat received by the nitrogen. 1 atm. = 101 x 103 Pa.7. An insulated container has 40.0-g of water at 70.0°C. How much as at -5.00°C needs to be added to bring the system to 25.0°C?1. A student wants to cool 0.25kg of diet soda (mostly water), initially at 25°C, by adding ice initially at -20 °C. How much ice should she add so that the final temperature will be 0 °C with all the ice melted if the heat capacity of the container maybe neglected? Cwater = 4, 186 J/kg-Cº Answer: Cice=2.09 x 103 J/kg-Cº L₁= 3.35 x105 J/kg mice = 0.069 kg (69 g)