Air at 10°c enters a 12-cm-diameter and 5-m-long pipe at a rate of 0.065 kg/s. the inner surface of the pipe has a roughness of 0.22 mm, and the pipe is nearly isothermal at 50°c. determine the rate of heat transfer to air using the nusselt number relation given by (a) eq. 8–66 and (b) eq. 8–71. evaluate air properties at a bulk mean temperature of 20°c. is this a good assumption?

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

we have been given a quadratic function and we need to restrict the domain such that it becomes a one to one function.

we know that vertex of this quadratic function occurs at (5,2).

further, we know that range of this function is .

if we restrict the domain of this function to either or , it will become one to one function.

let us know find its inverse.

upon interchanging x and y, we get:

let us now solve this function for y.

hence, the inverse function would be if we restrict the domain of original function to and the inverse function would be if we restrict the domain to .

magnets not strong enough

explanation: