Q3) A sphere of aluminum has a diameter of 5 cm is initially at a temperature of 200 °C is suddenly immersed in a fluid at 40 °c. The convection heat-transfer coefficient is 100 W/m? .° C. Estimate the time required to cool the aluminum to 90 °C, using the lumped- capacity method.

Q3) A sphere of aluminum has a diameter of 5 cm is initially at a temperature of 200 °C is suddenly immersed in a fluid at 40 °c. The convection heat-transfer coefficient is 100 W/m? .° C. Estimate the time required to cool the aluminum to 90 °C, using the lumped- capacity method.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Related questions

Q: There are two adjacent gears A and B, with 23 and 42 teeth respectively. Initially, both gears are…

A: Given:Gear A rotates clockwise initially and gear B rotates counterclockwise , and consider the…

Q: the position shown the position of the instantaneous center of zero velocity for link piece

Q: 3 B 2.

A: here, both figures are not correlated so, As per honor code and answering guidelines I can answer…

Q: the displacement of link 4 if the crank (link 2 )is rotated 135 degree clockwise.

Q: 5. Determine the radius of gyration.

Q: Original Question: The figure below represents a pair of bevel gears A and B. Gear A rotates in a…

A: Given:The angular velocity of member OC is equal to the angular velocity of gear B because gear A is…

Q: If roller A moves as shown, find the instant center of zero velocity of the bar AB and use it to…

A: Given:To find:(a) Angular velocity of AB.(b) Velocity of roller B.

Q: "o,A = '0,c =1.0 in; TAD =1.5 in; ro,a, = 1.0 in e, = 315°; 0,(-2.0, 1.0) B, on 2 B, on 4 2 30 5. 9…

A: INSTANTANEOUS CENTER: It is a point about a wedge a body in general motion can be assumed as in pure…

Q: Draw and find the Instant Centers of the Mechanism B 3 2 5,

Q: Q.3 The crank AB has a constant clockwise angular velocity of 2000 rpm. For the crank position…

A: The crank AB has a constant clockwise angular velocity of 2000 rpm. For the crank position…

Q: Crank OA rotates with a counterclockwise angular velocity of 8.1 rad/s. By the method of this…

A: The angular velocity of crank OA is

Q: L. = = 10

A: The angular velocity of member OC is equal to the angular velocity of gear B because gear A is…

Q: I Determine velocity of link 4 using graphical method. n is 10cm, 1nis 12cm and ez is 60° while link…

Q: For items 3-5, consider the bar assembly shown. The angular velocity of the bar AB is 4 rad/s…

A: To find: The velocity of the connector pin at B, the location of instantaneous center of link BC and…

Q: The hydraulic cylinder D extends, moves the rigid rod ABC, and causes the r A to move with velocity…

Q: Link AB has a constant angular velocity wAB = 4.4 rad/s counterclockwise as shown. (Figure 1)

Q: b bar below is three feet long and has an angular velocity of 3 rad of the bar. The initial velocity…

Q: determine the number of revolutions done by Disk E at the same time

A: The angular velocity of disk E will be the same as the angular velocity of disk F because both are…

Q: 3. For the planetary gear set shown, N2 = 10, N4 = 12, N; = 24 and N6 = 50. If w2 = 1, CCWand we =…

A: N2=10N4=12 N5=24N6=50ω2= 1 radsec CCWω6=1 radsec CW

Q: Determine the instant centers of the following mechanism. L 2 2" R. R C B -3-1/2"- 135° 4 3" 3" E

A: For solution refer below images.

Q: Determine the horizontal and vertical stroke of a slider D and F when crank AB rotates 30 legrees…

Q: Rod OA rotates counterclockwise at a constant angular rate 0 = 4 rad/s. The double collar B is…

Q: A B Given: AB= 10.5 m BC = 8.2 m 0 = 41° ß = 28° Determine the angular velocity in rad/s of link AB…

Q: What is the speed of the connector pin at B if the angular velocity of the bar AB is 8 rad/s…

Q: position, calculate the angular velocity in rad/s of bar AB.

Q: The instant center for AB is at: OA OB OC O Infinity O Somewhere else The instant center for BC is…

A: Given data :-Find out :- I centre for AB , BC and slider at point C.

Q: In the image on the right, there is a red gear G1 on the left with a radius of r1 = 2.81cm. Gear G1…

Q: In the mechanism, as shown above, the crank OA rotates at 20 rev/min. anticlockwise and gives motion…

Q: Determine the angular velocity of link AB at the instant shown if block C is moving upward at 15…

Q: 5/ B 3

Q: 2- The hydraulic cylinder produces a limited horizontal motion of point A. If v4 = 4 m/s when 0 =…

A: Given Data The velocity of portion A is: vA=4 m/s The angle of the O is: θ=45° To Determine The…

Concept explainers

Slope and Deflection

The slope in a deflected beam is described as an angle in radians made by the tangent of the section with the original axis of the beam. The deflection at any point on the axis of the beam is defined as the lateral displacement of the point before and after loading.

Question

solve Q3

please dont late

Q1) A laser slab with thermal conductivity of 5 W/m. K, thickness of 2 cm, has a uniform heat
generation of 4x105 W/m ³ due to uniform pumping assume the convection heat transfer from
the slab is 100 W/m?.C. if the environmental temperature is 15 ° C What is the surface
temperature of the slab also find the temperature at the center of the slab?
Q2) A semi-infinite solid of aluminum at an initial temperature of 20 °C is suddenly imposed
to surface temperature of 90 °C. Calculate the temperature at a depth of 1 cm after 1.8 s.
Q3) A sphere of aluminum has a diameter of 5 cm is initially at a temperature of 200 °C is
suddenly immersed in a fluid at 40 °C. The convection heat-transfer coefficient is
100 W/m? .° C. Estimate the time required to cool the aluminum to 90 °C, using the lumped-
capacity method.
Q4) Air at 1 atm and 20 °C flows across a large concrete surface 4 m wide and length of 2 m
and is maintained at 60°C The flow velocity is 0.1 m /s. Calculate the convection heat loss
from the surface. For air take [u=1.906×10 5 kg/m.s, k=0.0281 W/m •C, Pr=0.7, R=287 J/kg.K]
Assume
Nuį = 2NU×=L = 0.664RE9.5 Pr0.334
For Aluminum take density=2787 kg/m³, thermal conductivity (k) =216 W/m.K, specific
heat(c)=800 J/kg.K

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Step by step

Solved in 3 steps with 3 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

SUBJECT- MACHINE ELEMENTS
Adjustable Link L m Pivot Pivot Screw 'B' Gripper In the drawing, arm A is being driven back and forth in the direction of the arrows. It is connected to a gripper by way of an adjustable link L, two horizontal bars and two vertical bars. Screw B is a shoulder screw secured to arm A, but allows the horizontal bar to pivot around it. If the shoulder screw B was lowered towards the end of arm A, and the stroke of arm A remained the same, the stroke of the gripper would: Arm 'A' 0 MIMINIA
Show your work! 1. A car travels 40 miles east, then turns southeast and travels for 35 miles at an angle of -65°. 31- a. Find the components of the second vector (the one at -65°). to obutingsm adi bat d b. What is the magnitude of the displacement from the original position? L 8x Atsuborq azoto tolgay and bri c. What direction is the car traveling in? (In other words, find the angle.)
Steiner’s theorem and gyration radius. A metal tank wheel in the shape of a disc of radius R is lightened by cutting out six identical through- holes in the shape of discs, whose axes are parallel to the wheel’s axis of rotation, and whose radii are all r. The holes’ centers are positioned at the vertices of a regular hexagon of side A, with the wheel’s axis passing through the center of the hexagon. By what percentage is the wheel’s moment of inertia decreased around its rotation axis, as a result of the cut outs, for r=R/5 and A=3R/4. Is the solution: 27.95% (using negative mass for cutouts and parallel axis theorem)?
25,15mm and 14mm/s are the data's. Please help to solve
5. Neglect the diameters of the pulleys and establish the relationship between the velocity of A and the velocity of B for a given value of y. (Convention: Downward motion as positive.) B
Draw FBD and determine the number of revolutions done by Disk E at thesame time.
Steiner’s theorem and gyration radius. A metal tank wheel in the shape of a disc of radius R is lightened by cutting out six identical through- holes in the shape of discs, whose axes are parallel to the wheel’s axis of rotation, and whose radii are all r. The holes’ centers are positioned at the vertices of a regular hexagon of side A, with the wheel’s axis passing through the center of the hexagon. By what percentage is the wheel’s moment of inertia decreased around its rotation axis, as a result of the cut outs, for r=R/5 and A=3R/5? Is the solution: 18.24% (using negative mass for cutouts and parallel axis theorem)?
1
Asap please