Two rooms, each a cube 4.1 m per side, share a 12-cm-thick brick wall. Because of a number of 100-W lightbulbs in one room, the air is at 27 °C, while in the other room it is at 9.0 °C. Part A How many of the 100-W bulbs are needed to maintain the temperature difference across the wall? Express your answer as an integer. ? N = bulbs Submit Previous Answers Request Answer

One end of a 70-cm-long copper rod with a diameter of 2.0 cm is kept at 420 °C, and the other is immersed in water at 24 °C. Part A Calculate the heat conduction rate along the rod. Express your answer to two significant figures and include the appropriate units. t μA = Value Submit Units and Previous Answers Request Answer ?

An ideal gas at 20°C consists of 2.2 x 1022 atoms. 3.2 J of thermal energy are removed from the gas. Part A What is the new temperature in °C? Express your answer in degrees Celsius. DA ΑΣφ T = °C Submit Request Answer

A 40-cm-long icicle hangs from the eave of a house on a day when the temperature is -2.0°C. T Part A By how many millimeters does the icicle shrink if a bitterly cold wind drops the temperature to -20 °C? Express your answer with the appropriate units. AL= Submit xa μA Value 77 X.10n Units Previous Answers Request Answer ?

Question 5 Specific Heat of Solid Substances Substance D Aluminum B silver; because it is a transition metal with the lowest specific heat value C Iron Copper Tin Given the specific heat information presented, which substance would make the BEST material to create a pan for cooking and why? D Specific Heat (J/kg°C) 899 443 385 213 Tin - because it has a low specific heat, which means it conducts heat the best. Aluminum - because it has a high specific heat, which means it conducts heat the best. Copper - because it has a mid-level specific heat, which means it is a good insulator. Iron - because it has a mid-level specific heat, which means it is a good conductor.

Perfectly rigid containers each hold n moles of ideal gas, one being hydrogen (H₂) and other being neon (Ne). Part A If it takes 300 J of heat to increase the temperature of the hydrogen by 2.70°C, by how many degrees will the same amount of heat raise the temperature of the neon? Express your answer in degrees Celsius. ATNe= Submit 17 ΑΣΦ Request Answer ? °C

A physicist uses a cylindrical metal can 0.350 m high and 0.090 m in diameter to store liquid helium at 4.22 K; at that temperature the heat of vaporization of helium is 2.09 x 104 J/kg. Completely surrounding the metal can are walls maintained at the temperature of liquid nitrogen, 77.3 K, with vacuum between the can and the surrounding walls. Part A How much helium is lost per hour? The emissivity of the metal can is 0.200. The only heat transfer between the metal can and the surrounding walls is by radiation. Express your answer in gram per hour. Am At Submit ΠΕ ΑΣΦΑΦ Request Answer PZ ? Review | Constants g/h

A cylinder contains 0.250 mol of carbon dioxide (CO₂) gas at a temperature of 27.0°C. The cylinder is provided with a frictionless piston, which maintains a constant pressure of 1.00 atm on the gas. The gas is heated until its temperature increases to 127.0°C. Assume that the CO₂ may be treated as an ideal gas. Express your answer in joules. AU = Submit Part D Submit How much heat was supplied to the gas? Express your answer in joules. Part E W₁ = ΑΣΦ | Submit Request Answer ΑΣΦ Request Answer Request Answer < Return to Assignment Provide Feedback www How much work would have been done if the pressure had been 0.50 atm? Express your answer in joules. VE ΑΣΦ P Pearson = ? ? J ? J J

The basal metabolic rate is the rate at which energy is produced in the body when a person is at rest. A 68 kg (150 lb) person of height 1.83 m (6.0 ft) would have a body surface area of approximately 1.9 m². Part A What is the net amount of heat this person could radiate per second into a room at 19.0° C (about 66.2°F) if his skin's surface temperature is 31.0° C? (At such temperatures, nearly all the heat is infrared radiation, for which the body's emissivity is 1.0, regardless of the amount of pigment.) Express your answer in watts. ΑΣφ ? Hnet W %D Submit Request Answer Part B Complete previous part(s)

ConstanS T Pent Part A An experiment measures the temperature of a 400 g substance while steadily supplying heat to it. The figure shows the results of the experiment. (Figure 1) What is the specific heat of the solid phase? Express your answer to two significant figures and include the appropriate units. ? Value Units C = Submit Request Answer Part B What is the specific heat of the liquid phase? Express your answer to two significant figures and include the appropriate units. ? Value Units C = Submit Request Answer Part C Figure What is the melting temperature? Express your answer to two significant figures and include the appropriate units. T(°C) 80 ? 60 40 T, - Value Units 20 Q (kJ) 40 80 120 160 200 -20 Submit Request Answer -40