A metallic airfoil of elliptical cross section has a mass of 50 kg, surface area of...

A metallic airfoil of elliptical cross section has a
mass of 50 kg, surface area of 12 m2, and a specific heat of 0.50 kJ/kg °C. The airfoil is
subjected to air flow at 1 atm, 25°C, and 6m/s along its 3-m-long side. The average
temperature of the airfoil is observed to drop from 160°C to 140°C within 1 min of cooling.
Assuming the surface temperature of the airfoil to be equal to its average temperature and
using momentum-heat transfer analogy, determine the average friction coefficient of the
airfoil surface. (The air property: ρ=1.184 kg/m3, Cp=1.007 kJ/kg K, Pr = 0.7296)

Expert Solution

queen_honey_blossom answered 2 years ago

2) a). The resistivity of a wire varies with its length area of cross-section mass material...

2) a). The resistivity of a wire varies with its length area of cross-section mass material b) Given the units of a physical quantity. Choose the correct relation (J is for Joule, V is for volt, C is for Coulomb) A) J = CV B) J = VA C) J = C/A D) V = J C c) A charge of 3 C moving in a uniform electric field experiences a force 3000 N. The potential difference between two points...

Straight wooden rod of mass 6.0 kg, uniform cross-section 7 cm2, and constant density 700 kg...

Straight wooden rod of mass 6.0 kg, uniform cross-section 7 cm2, and constant density 700 kg has a very small mass 0.8 kg attached to its one end. The rod is partially submerged in water of density 990kg/m3. While in equilibrium, the rod floats in a vertical position with large part of it submerged. The rod is then pushed down by distance ymax from equilibrium and released resulting in its oscillation neat the surface of teh water. (Assuming no drag forces...

M1 has a mass of 6.330 kg. It is on a horizontal surface connected by a...

M1 has a mass of 6.330 kg. It is on a horizontal surface connected by a massless string to a hook where M2 can be increased smoothly. The pulley has a negligible mass & no friction. When M2= 3.266 kg it begins to accelerate downward at a rate of 2.110 m/s2. Calculate us - uk between M1 and the surface.

Suppose that we have a reservoir that has a surface area of 50 acres, with an...

Suppose that we have a reservoir that has a surface area of 50 acres, with an average depth when full of 15 meters. [Conversion: 1 acre = 4096.86 square meters] If the reservoir were to start out with a depth of 0 meters and eventually be filled to a depth of 15 meters, (1) how much volume of water will have been added in the filling of the reservoir from 0 meters depth to 15 meters depth? (2) What mass...

Two children, A (mass 25 kg ) and B (mass 50 kg ), are playing on...

Two children, A (mass 25 kg ) and B (mass 50 kg ), are playing on a merry-go-round (which you can assume is a solid disk with mass 225 kg and radius 1.5m). Assume that any friction on the axle of the merry-go-round is negligible. (A) A starts spinning the merry-go-round, giving it an angular velocity of 7 rad/s, then she stops pushing it. B runs with a speed of 6 m/s directly toward the center of the merry-go-round....

A block of mass 5 kg is sitting on a frictionless surface. The block initially has...

A block of mass 5 kg is sitting on a frictionless surface. The block initially has a velocity of 3 m/s. A force of 9 N is applied for 2 s. What is the Initial momentum of the block? kg m/s Tries 0/2 What is the Initial Kinetic Energy of the block? J Tries 0/2 What is the change in momentum of the block? Kg m/s Tries 0/2 What is the final momentum of the block? kg m/s Tries 0/2...

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with...

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. Immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30

Two pucks are sliding across a frictionless surface. Puck A has a mass of .330 kg...

Two pucks are sliding across a frictionless surface. Puck A has a mass of .330 kg and a velocity of 5.50 m/s in the x direction. puck be has a mss of .440 kg and a velocity of 6.60 m/s in the negative x direction. the pucks collide an bounce of each other. after the collision puck a has a velocity of 1.10 m/s in the positive y-direction. What are the x and y components of the velocity of puck...

A small block on a frictionless horizontal surface has a mass of 2.95×10−2 kg . It...

A small block on a frictionless horizontal surface has a mass of 2.95×10−2 kg . It is attached to a massless cord passing through a hole in the surface. (See the figure below (Figure 1) .) The block is originally revolving at a distance of 0.295 m from the hole with an angular speed of 1.85 rad/s . The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.140 m ....

A car with a mass of 1160 kg is traveling in a mountainous area with a...

A car with a mass of 1160 kg is traveling in a mountainous area with a constant speed of 73.6 km/h. The road is horizontal and flat at point A, horizontal and curved at points B and C. The radii of curvatures at B and C are: rB = 150 m and rC = 105 m. Calculate the normal force exerted by the road on the car at point Now calculate the normal force exerted by the road on the...

Question