Answer: Newton's law of cooling states that the rate of cooling is directly proportional to the difference in temperature between two points. Here, average of $90 \mathrm{C}$ and $40^{\circ}...
Answer: c) As a result, the critical temperature and pressure of carbon dioxide are 31.1 degrees Celsius and 73.0 atmospheres, respectively. Carbon dioxide will not liquefy above this temperature,...
co-exist in equilibrium? (b) What is the effect of the decrease of pressure on the fusion and boiling point of ?Answer: (a) The liquid and vapor phases of $CO_2$ coexist at the triple point temperature and pressure of − 56.6 degrees Celsius and 5.11 atmospheres. (b) When the pressure of $CO_2$...
Solution: Given: In this question, the initial temperature of the body is 80 degrees Celsius, and the final temperature of the body is 50 degrees Celsius. (T1 + T2)/2 is the average temperature. Avg...
Answer: (e) Steam at 100 degrees Celsius is significantly hotter than water at 100 degrees Celsius. This is due to the fact that steam contains a significant amount of heat in the form of latent...
Answer: (c) The radiation energy emitted by a red hot iron piece placed in a furnace can be calculated using the equation E=σT4...
Answer: (a) A body with high reflectivity absorbs heat radiation poorly. Poor absorbers emit poor radiations. So a reflective body is a poor emitter. (b) Brass conducts heat well while wood does...
and thickness 1.0 cm. It boils water at the rate of 6.0 kg/min when placed on a gas stove. Estimate the temperature of the part of the flame in contact with the boiler. Thermal conductivity of brass = 
; Heat of vaporisation of water = 2256 × 103 
.Solution: Given: A= 0.15 $m^2$ is the surface area of the brass boiler's base. D is the boiler's thickness, which is equal to 1 cm=0.01 m. The rate at which the brass boiler boils water is R=6.0...
. [Heat of fusion of water = 335 × 103 ]Solution: Given: Side of the cubical icebox, s =30 cm=3 x 10-2 m Thickness of the icebox, L =5.0 cm=0.05 m Mass of ice kept in the icebox, m=4 kg Time, t=6 h=6×60×60 = 21600 Outside temperature, T1=...
Solution: Given: The initial temperature of the child, Ti =101o F The final temperature of the child, Tf=98oF Decrease in the temperature, △T=(101−98)= 30 F = 3×(5/9)= 1.670 C Mass of the child,...
Answer: The diatomic molecules in the preceding list can move in translation, vibration, and rotation. A monoatomic gas can only move translationally. Heat is required to increase translational,...
Solution: Given the information in the question: Mass of the metal block, m = 0.20 kg = 200 g The initial temperature of the metal block, T1 = 1500C The final temperature of the metal block, T2 =...
Solution: Given, Mass of the copper block, m = 2.5 kg The temperature of the block, ΔT= 5000 C Specific heat of copper, c= 0.39 J g–1 K–1 Latent Heat of fusion of water, L = 335 J g–1 Let m’ be the...
Solution: Given: Power = 10 kW Mass of the small aluminium block, m = 8 kg = 8 x 103 g Time = 2.5×60=150 s Specific heat of aluminium, c= 0.91 J g–1 K–1. Total energy =P×t=104 ×150=15×105 J As 50%...
. What is the fractional change in its density for a 30 °C rise in temperature?Given: Coefficient of volume expansion of glycerine, $\alpha_{v}=49 \times 10^{-5} \mathrm{~K}^{-1}$ Rise in temperature, $\Delta \mathrm{T}=30^{\circ} \mathrm{C}$ Fractional change in volume...
.Solution: Given: Length of the brass rod = length of the steel rod = L0 = 50 cm Diameter of the brass rod = diameter of the steel rod = 3 mm Initial temperature ( T1) = 40°C Final temperature ( T2)...
Answer: Given: Initial temperature, T1=27oC Length of the brass wire at 27oC, l =1.8m Final temperature, T2=- 390C Diameter of the wire, d=2.0mm=2×10−3m Coefficient of linear expansion of...
.Solution: Given in the question: Diameter of hole ( D1) = 4.24 cm Initial Temperature, T1 = 27.0 °C = 27+ 273 = 300 K Final temperature, T2 =227 °C = 227+ 273 = 500K Let the diameter of the hole at...
.Solution: Given the information in the question: Temperature, T= 27 °C The outer diameter of the shaft at 27 °C is d1 = 8.70 cm The diameter of the central hole in the wheel at 27 °C is d2 = 8.69 cm...
Solution: Given: The temperature at which tape is calibrated: T = 27 °C At the temperature of 27 °C, the length of the tape is 1m = 100 cm T1 = 45 °C The length of the tape is 63 cm when the...
Solution: (a) Given: Triple point of water, T= 273.16K. Pressure in thermometer A at the triple point, PA =1.25×105 Pa Normal melting point of sulphur = T1 Pressure in thermometer A at this...
is related to the temperature tc on the Celsius scale by tc = T – 273.15. Why do we have 
in this relation, and not 273.16? (d) What is the temperature of the triple-point of water on an absolute scale whose unit interval size is equal to that of the Fahrenheit scale?Solution: (iii) The relationship exists because the melting point of ice equates to $273.15 K$ on the Kelvin scale, and the triple point of water corresponds to $273.16 K$ on the Kelvin scale. (iv)...
and 
, respectively. On the absolute scale, one of the fixed points is the triple-point of water, which on the Kelvin absolute scale is assigned the number 
What is the other fixed point on this (Kelvin) scale?Solution: i) Due to the fact that the melting and boiling points of water fluctuate with changes in pressure, the temperature of the triple point of water is not considered to be a standard fixed...
![\mathbf{R}=\mathbf{R}_{\mathrm{o}}\left[1+\alpha\left(\mathrm{T}-\mathrm{T}_{0}\right)\right]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-7d41138edf78cb4422493eb359a7f99c_l3.png "Rendered by QuickLaTeX.com")
The resistance is 
at the triple-point of water 
, and 
at the normal melting point of lead (600.5 K). What is the temperature when the resistance is 
?Solution: Given information in the question, Triple point temperature, $T_{0}=273.16 \mathrm{~K}$ Resistance at the triple point, $R_{0}=101.6 \Omega$ Normal melting point of lead, $T_{1}=600.5...
and 
. What is the relation between TA and TB?Solution: Given: Triple point of water on absolute scale $\mathrm{B}, \mathbf{T}_{2}=\mathbf{4 0 0} \mathbf{~ B}$ Triple point of water on absolute scale $A, T_{1}=200 A$ Triple point of water on...