Using the thermal radiation equation below and your knowledge of solar flux calculate the flux emitted from a star with a temperature of 6200 K to 2.d.p. Assume the star is a perfect black-body. The Stefan–Boltzmann thermal radiation equation is: P = AεσT4 Where P    = Power (W) A   = Surface area (m2) ε    = Emissivity σ    = The Stefan-Boltzmann constant is 5.67 x 10-8 W · m-2 · K-4 T    = Temperature (K)

Q: Suppose one side of a bimetallic strip has a coefficient of thermal expansion (oa.) of 7 x 10-7 K-1.…

A: Consider a bimetallic strip having different thermal expansion coefficients of both sides. When the…

Q: The radius of the Sun is 6.957x105 km. Surface temperature of the Sun is 5800 K. Mars reflects 15%…

A: Given, Radius of Sun, R = 6.957×105 km Surface temperature of the Sun, TS = 5800 K Distance between…

Q: At 25 °C, a sealed, rigid container is completely filled with liquid water. If the temperature is…

A: Given  Temperature T1 = 25 oC = 297.15 K                   Temperature rise = 10 oC…

Q: Water at 2.2048 MPa and 500 °C (state 1) is heated at constant pressure in a piston/cylinder…

A: Given:Water at 2.2048 MPa and 500 °C (state 1) is heated at constant pressure in a piston/cylinder…

Q: Two infinitely long parallel disks are in a vacuum. Disk 1 is a blackbody maintained at 25 °C. Disk…

A: Given data Two infinitely long parallel disks. vacuum medium. Disk 1 is a blackbody maintain at 25…

Q: What applied field change does the following chromogenic effect appear? 1) Solvatochromism: 2)…

A: Chromogenic effect is the reversible change of the optical properties of a material, like as color,…

Q: #5 In this example we have two glass bubbles connected to one another by a thin tube that is closed…

A: If a hot gas is mixed with a cold gas, heat is transferred from the hot gas to cold gas. This heat…

Q: Example 4.1 : Calculate the heat loss by radiation from an unlagged horizontal steam pipe, 50 mm…

A: Above problem is based on radiation heat transfer. Radiation is one mode of heat transfer. Radiation…

Q: a closed, rigid tank contains only water vapor and has a dew point of 50 Celsius. the total mass of…

A: Given, The dew point of water, Td = 50 °C The temperature of the water, T = 70 °C

Q: Convert the following temperature. a. T=-40⁰F to ˚R, K, ˚C b. ∆T=-40⁰F to ˚R, K, ˚C

A:

Q: 1-a Sub-cooling of the liquid can takes place either inside or outside the condenser, discuss in…

A: Sub-Cooling is the process of cooling the condensate further below its saturation temperature. It is…

Q: 2. Atmospheric pressure water boils in a stainless steel kettle with Tx = 8C. Estimated heat flux…

A: The water boiling heat transfer coefficient is calculated by empirical relations. These are given by…

Q: Estimate the critical point of Kr, reason? Evaluate the phase rule at the point indicated?explain…

A: It is required to calculate the critical point of Krypton and the phase rule at the point indicated.…

Q: 1. Consider two cases involving parallel flow of dry air at V = 1 m/s, T = atmospheric pressure over…

A: Given data: V=1 ms T∞=45 °C Ts=20 °C Rexc=5x 105 Ratio of thermal and hydrodynamic boundary layer…

Q: [3] Consider saturated liquid water initially at 1000 kPa that is "flashed" to 101.325 kPa in an…

A: Initial temperature of the saturated liquid = 1000 kPa Final temperature of the water = 101.325 kPa

Q: For heat transfer, We have thermal diffusivity and thermal conductivity. But For mass transfer, We…

A: Thermal conductivity is defined as the ability of a material to conduct heat. It is the heat…

Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.