Part A A scientist whose scale is broken but who has a working 2.7 kW heating coil and a thermometer decides to improvise to determine the mass of a block of aliminum she has recently acquired. She heats the aluminum for 30.0 s and finds that its temperature increases from 20°C to 35° C. What is the mass of the aluminum? Express your answer with the appropriate units. H HẢ Value Units m = Submit Previous Answers Request Answer

Part A A scientist whose scale is broken but who has a working 2.7 kW heating coil and a thermometer decides to improvise to determine the mass of a block of aliminum she has recently acquired. She heats the aluminum for 30.0 s and finds that its temperature increases from 20°C to 35° C. What is the mass of the aluminum? Express your answer with the appropriate units. H HẢ Value Units m = Submit Previous Answers Request Answer

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter1: Temperature And Heat

Section: Chapter Questions

Problem 95P: (a) What is the rate of heat conduction through the 3.00-cm-thick fur of a large animal having a I...

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(a) If the partial pressure of water vapor is 8.05 torr, what is the dew point? (760 torr = I atm 101, 325 Pa) (b) On a warn day when the air temperature is 35 and the dew point is 25 , what are the partial of the water in the air and the relative humidity?
A mercury thermometer still in use for meteorology has a bulb with a volume of 0.780 cm3 and a tube for the mercury to expand into of inside diameter 0.130 mm. (a) Neglecting the thermal expansion of the glass, what is the spacing between marks 1 apart? (b) If the thermometer is made of ordinary glass (not a good idea), what is the spacing?
What is the average kinetic energy in joules of hydrogen atoms on the 5500 surface of the Sun? (b) What is the average kinetic energy of helium atoms in a legion of the solar corona where the temperature is 6.00105 K ?
Lead has a density of 11.3 103 kg/m3 at 0C. (a) What is the density of lead at 90C? (b) Based on your answer to part (a), now consider a situation in which you plan to invest in a gold bar. Would you be better off buying it on a warm day? Explain.
(a) What is the rate of heat conduction through the 3.00-cm-thick fur of a large animal having a I .40-m surface area? Assume that the animal's skin temperature is 32.0 , that the air temperature is 5.00 , and that has the same thermal conductivity as air. (b) What food intake will the animal need in one day to replace this heat transfer?
The Sun radiates like a perfect black body with an emissivity of exactly 1. (a) Calculate the surface temperature of the Sun, given that it is a sphere with a 7.00108m radius that radiates 3.801026W into 3-K space. (b) How much power does the Sun radiate per square meter of its surface? (c) How much power in watts per square meter is that value at the distance of Earth, 1.501011m away? (This number is called the solar constant.)
One process for decaffeinating coffee uses carbon dioxide ( M=44.0 g/mol) at a molar density of about 14,0 mol/m3 and a temperature of about 60 . (a) Is CO2 a solid, liquid, gas, or supercritical fluid under those conditions? (b) The van der Waals constants for carbon dioxide are a=0.3658 Pa m6/mol2 and b=4.286105 m3/mol. Using the van der Waals equation, estimate pressure of CO2 at that temperature and density. `
28. QC S Review. Figure P1.28 shows students studying the thermal conduction of energy into cylindrical blocks of ice. As we will see in Chapter 19, this process is described by the equation km²(Th – T.) Q At 4L For experimental control, in one set of trials all quantities except d and At are constant. (a) If d is made three times larger, does the equation predict that At will get larger or get smaller? By what factor? (b) What pattern of proportionality of At to d does the equation predict? (c) To display this proportionality as a straight line on a graph, what quantities should you plot on the horizontal and vertical axes? (d) What expression represents the theoretical slope of this graph?
An engineer is designing a cooling system for a chemical process that produces 52 kJ of heat every second. What minimum mass of water must be used each second to absorb the heat if the initial temperature of the water is 14.0 oC and the maximum temperature that the water can be released to the environment is 17.5 oC? The specific heat of water is .
A container holds 1.0g of argon at a pressure of 8.0atm How much heat is required to increase the temperature by 100∘C at constant volume? How much will the temperature increase if this amount of heat energy is transferred to the gas at constant pressure?
Before going in for an annual physical, a 70.0-kgkgperson whose body temperature is 37.0∘C Consumes an entire 0.355-literliter can of a soft drink (which is mostly water) at 12.0∘C What will be the person's body temperature TfinalTfinal after equilibrium is attained? Ignore any heating by the person's metabolism. The specific heat capacity of a human body is 3480 J/kg⋅KJ/kg⋅K. Is the change in the person's body temperature great enough to be measured by a medical thermometer? (A high-quality medical thermometer can measure temperature changes as small as 0.1∘C∘C or less.)
Ue A:0r * Il. pluls ► exam 1.pdf Q1// Define the following First law of thermodynamics, adiabatic process, Boyle's law, Reversibility, and Pressure. Q2// Ten kg of oxygen are heated from 350 to 500 K at constant pressure. Calculate the change of enthalpy, change internal energy, heat transfer and work done. Take Cp-0.909, Cv=0.649 Q3// In a nozzle air at 700°C and twice atmospheric pressure enters with 50 m/s velocity, and leaves at a temperature of 40°C. Determine velocity of air at exit. Take Cp = 1.005 kJ/kg.K for air.