Bundle: Refrigeration and Air Conditioning Technology, 8th + MindTap HVAC, 4 terms (24 months) Printed Access Card
8th Edition
ISBN: 9781337190350
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Textbook Question
Chapter 42, Problem 6RQ
The typical indoor design temperature used for heat gaincalculations is
A. 65°F.
B.70 °F.
C.75 °F.
D. 80°F.
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1.4 (A). Two forkend pieces are to be
joined together by a single steel pin of
25mm diameter and they are
required to transmit 50 kN. Determine
the minimum cross-sectional area
of material required in one branch of
either
fork if the stress in the fork material is
not to exceed 180 MN/m2. What will be
the maximum shear stress in the pin?
C1.39 x 10e4mZ; 50.9MN/mZ.]
10:41
1.2 (A). A steel tube, 25 mm outside
diameter and 12mm inside diameter,
cames an axial tensile load of 40 kN.
What will be the stress in the bar? What
further increase in load is possible if
the stress in the bar is limited to
225 MN/mZ? [lo6 MN/m3; 45 kN.1
1.11 (a) A test piece is cut from a brass
bar and subjected to a tensile test.
With a load of 6.4 kN the test piece, of
diameter 11.28 mm, extends by 0.04
mm over a gauge length of 50 mm.
Determine:
(i) the stress, (ii) the strain, (hi) the
modulus of elasticity.
(b) A spacer is turned from the same
bar. The spacer has a diameter of 28
mm and a length of 250mm. both
measurements being made at 20°C.
The temperature of the spacer is
then increased to 100°C, the natural
expansion
being entirely prevented. Taking the
coefficient of linear expansion to be 18
x 10-6/"C determine:
(i) the stress in the spacer, (ii) the
compressive load on the spacer.
[C.G.] [64MN/m2, 0.0008, 80GN/m2,
115.2 MN/m2, 71 KN.]
10:41
Chapter 42 Solutions
Bundle: Refrigeration and Air Conditioning Technology, 8th + MindTap HVAC, 4 terms (24 months) Printed Access Card
Ch. 42 - An oversized air-conditioning system will A. cost...Ch. 42 - Methods used to calculate the heat gain and heat...Ch. 42 - An exterior wall A. separates a conditioned...Ch. 42 - A partition wall A. separates a conditioned...Ch. 42 - As the temperature differential across a panel...Ch. 42 - The typical indoor design temperature used for...Ch. 42 - The typical indoor design temperature used for...Ch. 42 - If a heating system was being designed for use in...Ch. 42 - If an air-conditioning system was being designed...Ch. 42 - If the R-value of a construction material is 2.0,...
Ch. 42 - If a wall is made up of four different materials,...Ch. 42 - Prob. 12RQCh. 42 - All of the following are taken into account on a...Ch. 42 - How much heat is lost through a 3' 5' single-pane...Ch. 42 - Which of the following is(are) true regarding a...Ch. 42 - Which of the following is(are) true regarding the...
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- Part A The man pulls on the rope with a force of F = 30 N as shown in (Figure 1). Figure 1.5 m 3 m. 4m 10.5 m 1 of 1 Determine the position vector from O to A. Express the x, y, and z components of the position vector in meters to three significant figures separated by commas. ΜΕ ΑΣΦ vec (TOA). (TOA)y. (TOA)== Submit Request Answer Part B m Determine the position vector from O to B. Express the x, y, and z components of the position vector in meters to three significant figures separated by commas. ΜΕ ΑΣΦ ↓↑ vec (TOB)x, (TOB)y, (TOB) = Submit Request Answer Part C Complete previous part(s) Provide Feedback ? marrow_forward4 Part A The tool is used to shut off gas valves that are difficult to access (Figure 1). Figure 0.25 m 30 0,4 m < 1 of 1 If the force F= {-60i+40j+15k} N is applied to the handle, determine the component of the moment created about the z axis of the valve. Express your answer with the appropriate units. Mz = Value Submit Request Answer Provide Feedback | ? Unitsarrow_forward3. A steam power plant has an average monthly net power delivery of 740 MW over the course of a year. This power delivery is accomplished by burning coal in the boiler. The coal has a heating value of 9150 Btu/lbm. The cost of the coal is $14.20/ton. The overall thermal efficiency of the plant is, nth Wnet Qboiler 0.26 = 26% Determine the annual cost of the coal required to deliver the given average monthly power.arrow_forward
- The cable exerts a force of P = 4 kN at the end of the 8-m-long crane boom. A P 8 m B -x- I'm En ▾ Part A If 0 = 30°, determine the placement x of the boom at B so that this force creates a maximum moment about point O. Express your answer to three significant figures and include the appropriate units. x = 9.81 m Submit Previous Answers ✓ Correct ▾ Part B What is this moment? Express your answer to three significant figures and include the appropriate units. Assume the positive direction is counterclockwise. (Mo) max 43.7 = E ? N Submit Previous Answers Request Answer X Incorrect; Try Again; 28 attempts remaining Enter your answer with a different unit type. Review a list of acceptable units.arrow_forwardFind highest and lowest temperature.arrow_forwardExplained step by step.arrow_forward
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