After a quick visit to the local bakery you decide to cut the steaming hot loaf of bread. You then notice that the bread decrease in physical size when you try to cut it with a large knife. Your mother then advises you to allow the now 'slightly smaller' loaf to cool off for about 20 minutes before you attempt to cut it again... What happened to the density of the loaf of bread after you 1st attempted to cut it? O A. Not enough information is supplied to figure this one out! OB. The bread density most probably decreased a little. OC. The bread density most probably stayed the same. D. The bread density most probably increased a little. Reset Selection

After a quick visit to the local bakery you decide to cut the steaming hot loaf of bread. You then notice that the bread decrease in physical size when you try to cut it with a large knife. Your mother then advises you to allow the now 'slightly smaller' loaf to cool off for about 20 minutes before you attempt to cut it again... What happened to the density of the loaf of bread after you 1st attempted to cut it? O A. Not enough information is supplied to figure this one out! OB. The bread density most probably decreased a little. OC. The bread density most probably stayed the same. D. The bread density most probably increased a little. Reset Selection

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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A student drops two metallic objects into a 120-g steel container holding 150 g of water at 25°C. One object is a 206-g cube of copper that is initially at 83°C, and the other is a chunk of aluminum that is initially at 5.0°C. To the surprise of the student, the water reaches a final temperature of 25°C, precisely where it started. What is the mass of the aluminum chunk? kg eBook
Part A Helium gas with a volume of 2.60 L, under a pressure of 0.190 atm and at a temperature of 43.0° C, is warmed until both pressure and volume are doubled. What is the final temperature? Express your answer in degrees Celsius. ? T = 172 °C Submit Previous Answers Request Answer Previous Answers X Incorrect; Try Again; 5 attempts remaining Part B How many grams of helium are there? The molar mass of helium is 4.00 g/mol. Express your answer in grams. V ΑΣφ m =
Q.13 What happens if you add heat to water that is at the temperature of 100°C? Does the temperature change? Explain.
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AL = a AT Activity 2 = BAT %3D Schmedrick takes his dune buggy to the gas station and fills it the very brim. His tank is a steel cylinder of radius 23 cm and height 45 cm (big enough to hold about 20 gallons). He burns a liter of gas getting to the beach, where both the tank and the gas heat up by 20 °C. Both the tank and the gas expand. For steel a = 1.1· 10$/°C. For gasoline B = 9.6- 104/°C. Does the tank overflow? 1. Use the linear expansion formula to calculate the increase in radius of the tank: up to Hints. 5.06 · 103 cm 2. Use the linear expansion formula to calculate the increase in height of the tank: 9.9 ·103 cm 3. For a cylinder, V = ar?h. Calculate the increase in volume of the tank: 4. Calculate the volume of gasoline at the beach before expansion. (1 cm³ = 1 mL): 73 785.613 cm³ 5. Use the volume expansion formula to calculate the increase in volume of the gasoline: 1416.684 cm³ 6. Conclusion: Schmed will be kicked out for spilling gas at the beach! %3D 49.3694 cm³
In this problem you will consider the effect that thermal expansion due to temperature will have on Archimedes' principle. Take the densities of water and copper at 0ºC to be 1.00 × 103 kg/m3 and 8.90 × 103 kg/m3, respectively. a. Calculate the fraction of a copper block’s weight that is supported by the buoyant force at 0°C. b. Calculate the fraction of a copper block’s weight that is supported by the buoyant force at 95°C. Assume the volume expansion coefficient of copper is βC = 5.10 × 10-5 1/°C.
A copper sample (ccu = 387 J/kg•K) of mass mẹ = 75 g and temperature Te = 312ºC is dropped into a glass beaker that contains a mass of water me = 220 g (cw = 4190 J/kg•K). %3D The initial temperature of the water and the beaker is Tw,b = 12.0°C. What is the final temperature of the copper, beaker, and water? * The heat capacity (the specific heat times the mass) of the beaker is Cb' = 190 J/K.
O Example : o The base of an insect's leg is approximately spherical in shape ,with a radius of about 2x10-5 m. The 0.003 g mass of the insect is supported equally by the six legs .calculate the angle 0 for an insect on the surface of water .Assume the water temperature is 20°C ?
22. Carry out the operation. Express the answer by rounding it off to the correct significant figures. (7.8 0.34) / (1.15 +0.82) - 3.8 3.79 3.78 3.787
A 850 g aluminum pan is removed from the stove and plunged into a sink filled with 11.0 L of water at 20.0 °C. The water temperature quickly rises to 24.0 °C. Part A What was the initial temperature of the pan in °C? Express your answer with the appropriate units. Tinitial Submit Part B 11 Tinitial VO V—| ΑΣΦ Request Answer What was the initial temperature of the pan in °F? Express your answer with the appropriate units. VE ΑΣΦ C Ć SALA CO — ? ? °F °C
A hot air balloon uses the principle of buoyancy to create lift. By making the air inside the balloon less dense then the surrounding air, the balloon is able to lift objects many times its own weight. A large hot air balloon has a maximum balloon volume of 2090 m3. a. If the air temperature in the balloon is 54 °C, how much additional mass, in kilograms, can the balloon lift? Assume the molar mass of air is 28.97 g/mol, the air density is 1.20 kg/m3, and the air pressure is 1 atm.