a .25 mm diameter wire .2 m long is to be held at 1035 deg C....

a .25 mm diameter wire .2 m long is to be held at 1035 deg C. The wires surface is black. how much electrical power is required to maintain it's temp? The surrounding air and room are both at 20 deg C. The room is also assumed to be black . Find : Raleigh number, nusselt number, HTC and power required to maintain temperature.

Expert Solution

samet mamat answered 2 years ago

The upper end of a vertical steel wire 4mm diameter and 2,5 m long is held...

The upper end of a vertical steel wire 4mm diameter and 2,5 m long is held securely. The other end is fixed central to a steel cylinder, 80 mm diameter and of density 7,8 Mg/m3, arranged with its axis vertically. Determine the length of the cylinder to give 0,6 torsional vibration per second.

A piano wire 0.90 m long and 0.85 mm in diameter is fixed on one end....

A piano wire 0.90 m long and 0.85 mm in diameter is fixed on one end. The other end is wrapped around a tuning peg 3.5 mm in diameter. Initially the wire, whose Young's modulus is 2.4×1010N/m2, has a tension of 30 N . Part A Find the tension in the wire after the tuning peg has been turned through one complete revolution. Express the tension in newtons to two significant figures. T = 166.16 N SubmitPrevious AnswersRequest Answer Incorrect;...

A wire made from tungsten is 4.5 m long and 0.45 mm in diameter. What is...

A wire made from tungsten is 4.5 m long and 0.45 mm in diameter. What is its resistance at 1500°C?

Suppose a 1-m length of aluminum wire 0.001 m in diameter is held in a horizontal...

Suppose a 1-m length of aluminum wire 0.001 m in diameter is held in a horizontal east-west position (in vertical equilibrium) by an external magnetic eld directed north of strength 1 G = 10-4 T. The density aluminum = 2:70 103 kg/m3 and the resistivity aluminum = 2:65 10?8 m. Also note the volume of a cylinder is Vcyl = r2h. (a) Find the resistance RAl of the aluminum wire. (b) Find the volume VAl of the aluminum wire. (c)...

If the wire diameter decreases to 1 mm but the length is still 20 m and...

If the wire diameter decreases to 1 mm but the length is still 20 m and still carrying the same 20.0 A current, the drift speed of electrons will (increase / decrease / stay the same), the current density will (increase / decrease / stay the same), the resistivity of the wire will (increase / decrease / stay the same), the resistance of the wire will (increase / decrease / stay the same), the electric field inside the wire will (increase / decrease / stay...

A 580-mm long tungsten wire, with a 0.046-mm-diameter circular cross section, is wrapped around in the...

A 580-mm long tungsten wire, with a 0.046-mm-diameter circular cross section, is wrapped around in the shape of a coil and used as a filament in an incandescent light bulb. When the light bulb is connected to a battery, a current of 0.526 A is measured through the filament. (Note: tungsten has a resistivity of 4.9 × 10-8 ? • m.) How many electrons pass through this filament in 5 seconds? How many electrons pass through this filament in 5...

A long wire of diameter D = 2mm is submerged in an oil bath at 25...

A long wire of diameter D = 2mm is submerged in an oil bath at 25 degrees C. The wire has an electrical resistance per unit length of R’ = 0.015 Ω/m. If a current of I = 75A flows through the wire and the convection coefficient is h = 400 W/m2*K, what is the steady-state temperature of the wire? From the time the current is applied, how long does it take for the wire to reach a temperature that...

What is the resistance of a 2.9-m length of copper wire 1.4 mm in diameter?

What is the resistance of a 2.9-m length of copper wire 1.4 mm in diameter? The resistivity of copper is 1.68×10-8Ω⋅m.

Air enters a thin-walled, 5-mm diameter, 2-m-long tube at a uniform inlet temperature of 100°C. A...

Air enters a thin-walled, 5-mm diameter, 2-m-long tube at a uniform inlet temperature of 100°C. A constant heat flux is applied to the air from the tube surface. The mean temperature of air at halfway along the tube (at 1 m length) is reported as 126°C. If the tube surface temperature at the exit is 160°C and the local heat transfer coefficient at the exit is 29.5 W/m^2K, determine a) the applied heat flux, b) the rate of energy increase...

1)calculate the polar moment of inertia of a wire with a 2 mm diameter 2) what...

1)calculate the polar moment of inertia of a wire with a 2 mm diameter 2) what is the difference between the elastic modulus (E) and the shear Modulus (G) ?

Question