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Question: Insulation placed on a small-diameter pipe or electrical wire to prevent heat loss may actually increase the heat loss instead. This occurs because as the insulation radius rz increases, the insulation thermal resistance increases but the outside surface area is increased at the same time. The result is that the rate of heat loss will increase with increasing r2 until a maximum heat loss is reached, after which further increase in rz lowers rate of beat loss.
if the inside surface temperature of the surroundings are at TZ, find the value of insulation, T1, is known, and the rz for maximum rate of heat loss. Assume that T1, T2, k, h, and r1 are constant.
White light is incident normally on a thin soap film ( = 1.33) suspended in air. What are the two minimum thicknesses that will constructively reflect yellow ( = 577 ) light? Enter your answers in ascending order separated by a comma
A voltmeter is connected in parallel to a resistor when measuring Vi. Why is the measured voltage across a 10 M Ω resistor not equal to the voltage measured across a power supply?
Light from a helium-neon laser (l=608 nm) passes through a circular aperture and is observed on a screen 2.15 m behind the aperture. What is the diameter (in mm) of the hole
A charged belt, 50 cm wide, travels at 30 m/s between a sourceof charge and a sphere. The belt carries charge into the sphere ata rate corresponding to 100 μA. Compute the surface chargedensity on the belt.
question the frequency of a light wave is the same when the light travels in two different media. assuming that the
After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 46.0 cm. What is the value of the acceleration of gravity on this planet
Your van is parked on a steep hill with a 12o slope with the van held in place by the parking brake. The coefficient of static friction between your van's tires and the road when wet is 0.25. Find the largest angle slope on which you can park your ..
What is the capacitive reactance of two square pieces of sheet metal 2.00 meters on a side, separated by 20.0 cm, which operate at an angular frequency of 6.000e+6 rad/s
The captain of a ship grabs hold of the wheel with one hand a distance of 0.285m from the axis of rotation to adjust the rudder. what is the magnitude of the torque
Given a sphere of charge inside a conductor. The sphere has a radius of 5cm. Find the charge on the outisde of the conductor
A block of mass m = 5.6 kg, moving on a frictionless surface with a velocity of 6.5 m/s to the right, collides with a block of mass 10.0 kg at rest, What is the initial velocity of the 10.0 kg block immediately after the collision
Two electrons in a vacuum exert force of F = 4.11E-08 N on each other. How far apart were the electrons originally in meters
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