Thermal Expansion Questions

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Thermal Expansion Solutions

After sunset on a hot summer day, the bricks in the wall of a building feel warm, but the glass windows do not. Why? The bricks have a higher heat capacity. The glass has a higher heat capacity. Bricks are good at conducting heat. The glass is transparent and the brick is not.

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[Review Topics) [References) Use the References to access important values if needed for this question, In the laboratory a student finds that it takes 61.0 Joules to increase the temperature of 12.7 grams of solid zinc from 22.1 to 35.4 degrees Celsius. The specific heat of zinc calculated from her data is yg°C. Submit Answer Retry Entire Group 1 more group attempt remaining

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Ilus Il eeuea Tor this question. A sample of gaseous krypton is heated with an electrical coil. If 55.1 Joules of energy are added to a 13.6 gram sample initially at 22.9°C, what is the final temperature of the krypton? © Answer: lºc.

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at lo 4. A new bridge is built with metal expansion joints. The bridge is 1.5 km long. One day, the temperature starts at -4°C and reaches a high of 12°C. How much does the bridge expand? (10 points) Assume that the coefficient of linear expansion of the joints is DO 0.00002 / °C.

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You observe the light from a spectroscopic binary star system, and determine the two stars have different masses. Based on this knowledge, which of the following is also true? O a. the orbital velocity of the lower mass star will be greater b. the orbital period of the lower mass star will be shorter than that of the high mass star Oc the more massive star will exhibit a greater maximum redshift O d. the more massive star will be further from the center of mass

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It's estimated that a star with the mass of our sun will take about 10 billion years to consume all of its core hydrogen fuel. What's a reasonable estimate for how long a star with 5 times the sun's mass will take to consume all of its hydrogen fuel? Select one: O A. 100 billion years OB 50 billion years OC. 2 billion years OD. 500 million years O E. 50 million years

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Newton's Law of Cooling states that the rate of change of the temperature of an object, T, is proportional to the dT difference of T and the temperature of the region, Tror = k(T-TR). An object with core temperature of 1200°F is dt removed from a fire and placed in a region with a constant temperature of 80°F. After 1 hour, its core temperature is 830°F. What is the object's core temperature 4 hours after it is taken off the fire? (1 point) 370.4010°F 305.2214°F 225.2214°F 145.4010°F

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4. The temperature of 250 liters of ethyl alcohol is increased from 294 K to 324 K. The coefficient of volume expansion for ethyl alcohol is 1.12 x 10-4 per Celsius degree. What is the change in volume?

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Two rods A and B of identical dimensions are at temperature 30°C. If A is heated upto 180°C and B upto T°C, then the new lengths are the same. If the ratio of the coefficients of linear expansion of A and B is 4:3, then the value of T is O 270°C O 230°C 250°C 200°C

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A steel rod of length 1 m is heated by 100°C such that it expands freely by 1.2 mm. Find the stress developed in the rod. (Take, Y = 200 MPa, asteel = 12 * 10-6 °C-?). = 0 12 x 104 Pa O 24 x 106 Pa 24 x 104 Pa Zero

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2. One end of an iron poker is placed in a fire at 502 °C. The other end is 26°C. The poker is 1.2 m long and has a 5 mm radius. What is the cross sectional area? Metal Copper Gold Aluminum Iron Bronze Stainless steel Thermal conductivity 390 316 220 80 45 15 What is the rate of heat transfer? 3. Answer question 2 using aluminum instead of iron. How much heat is conducted in 6 seconds?

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[8] - 2. Answer the following questions : (i) What is the effect on the surface tension of molten copper on increasing its temperature? (1) (ii) Why is a NOT gate known as an INVERTER? (1) (iii) On what factors do the degrees of freedom depend? (1) (iv) In successive radioactive decay if the decrease in mass number is 32 and the decrease in atomic number is 8, how many a particles and ß particles are emitted in the process? (1) (v) Define angular SHM. (1) (vi) What are the slope and y-intercept in the graph of stopping potential against frequency of radiation for a certain photo- emitter? (1) (vii) The speed of transverse waves on a vibrating string is 50 m/s. If the length of the string is 0.25 m, what is the frequency of the first overtone? (1) (viii) What is the Bohr magneton? (1) SECTION-B