Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN: 9781133612315
Author: Jack Erjavec, Rob Thompson
Publisher: Cengage Learning
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Textbook Question
Chapter 15, Problem 3RQ
What are the two types of wires and which is the most commonly used in automobiles?
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A property owner on a lake is given an aluminum dock for his property. Unfortunately the dock
is too large and heavy to move over land. Instead the owner has this idea (which his family
thinks is insane) to move the dock by water. The dock is 20 ft long, 3ft wide, and weighs 350 lbs.
The owner decides to float the dock using 50 gallon plastic drums filled with air.
a) (5 points) How many 50 gallon drums are required to float the dock?
b) (3 points) How many would you recommend the home owner actually use and in what
configuration? Why?
A large water tank is being filled from a water source as shown in the figure below with a
desired flow rate of 20 L/min.
H₁=8 m
D+=15 m
Hw=2 m
2 m
9m
Pipe is 4" dia, copper
P
Water source
(assume V=0)
2m-
a) (2 Points) Is the flow laminar or turbulent?
b) (6 points) What are the major losses in the pipe?
c) (3 Points) How much power (in Watts) does the pump need to be to fill the tank?
d) (2 Points) If the pump is 93% efficient, how much power must be supplied to the pump?
e) (2 Points) If we considered minor losses, would it take more time, less time or the same
amount of time to fill the tank? Explain why (in words, no math)
Water at 50°C flows steadily through a tank shown in the figure below. At section 1, D₁ = 45 cm,
and the volume flow is 25 m³/h. At section 2, D₂ =15 cm and the average velocity is 6.14 m/s. If
D3 = 700mm, what is:
a) (4 points) the mass flow rate through section 3 in kg/min?
b) (2 points) the average velocity through section 3 in m/s?
c) (3 points) Is the flow in or out of the tank at section 3?
3
2
Chapter 15 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 15 - What is represented by the E, I, and R in the...Ch. 15 - Prob. 2RQCh. 15 - What are the two types of wires and which is the...Ch. 15 - Define voltage drop.Ch. 15 - Define circuit protection.Ch. 15 - What is a normally dosed switch?Ch. 15 - Prob. 7RQCh. 15 - What is the difference between voltage and...Ch. 15 - What is an SPST switch?Ch. 15 - Which type of resistor is commonly used in...
Ch. 15 - Prob. 11RQCh. 15 - Solve the parallel circuit for total circuit...Ch. 15 - Prob. 13RQCh. 15 - Prob. 14RQCh. 15 - Prob. 15RQCh. 15 - Prob. 1ASRQCh. 15 - Prob. 2ASRQCh. 15 - WHiile discussing the circuit shown in Figure...Ch. 15 - While discussing electrical grounds: Technician A...Ch. 15 - Prob. 5ASRQCh. 15 - Prob. 6ASRQCh. 15 - While discussing copper wire: Technician A says...Ch. 15 - While discussing current flow: Technician A says...Ch. 15 - While discussing voltage Technician A says that...Ch. 15 - While discussing the AWG system: Technician A says...
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- A small airplane has a total mass of 1900 kg and a wing area of 42 m² and is cruising at an altitude of 4000 m at a constant speed of 280 km/h and generating 190 kW of power. The density of standard air at an altitude of 4000 m is p = 0.819 kg/m³ (4 Points) What is the lift coefficient? (3 Points) What is the drag coefficient? (2 Points) What is the lift to drag ratio?arrow_forward4.75 An air-conditioning system is shown in Fig. P4.75 in which air flows over tubes carrying Refrigerant 134a. Air enters with a volumetric flow rate of 50 m³/min at 32°C, 1 bar, and exits at 22°C, 0.95 bar. Refrigerant enters the tubes at 5 bar with a quality of 20% and exits at 5 bar, 20°C. Ignoring heat transfer at the outer surface of the air conditioner, and neglecting kinetic and potential energy effects, determine at steady state (a) the mass flow rate of the refrigerant, in kg/min. (b) the rate of heat transfer, in kJ/min, between the air and refrigerant. 3 R-134a P3 = 5 bar x3 = 0.20 Refrigerant 134 Air P₁ = 1 bar T₁ =32°C 305 K (AV), 50 m³/min = Air 2-P2 = 0.95 bar T2 22°C 295 K = = 4 R-134a P4 = 5 bar T4=20°Carrow_forward4.42 Steam enters a well-insulated turbine operating at steady state at 4 MPa with a specific enthalpy of 3015.4 kJ/kg and a velocity of 10 m/s. The steam expands to the turbine exit where the pressure is 0.07 MPa, specific enthalpy is 2431.7 kJ/kg, and the velocity is 90 m/s. The mass flow rate is 11.95 kg/s. Neglecting potential energy effects, determine the power developed by the turbine, in kW.arrow_forward
- The two blocks A and B have weights WA = 60 lb and WB = 10 lb. If the kinetic coefficient of friction between the incline and block A is μk = 0.2, determine the speed of A after it moves 3 ft down the plane starting from rest. Neglect the mass of the cord and pulleys. 3 Barrow_forward123 12) The spring has a stiffness k = 200 N/m and an unstretched length of 0.5 m. If it is attached to the 3-kg smooth collar and the collar is released from rest at A, determine the speed of the collar when it reaches B. Neglect the size of the collar. 2 m S Z k=200 N/m B 1.5 marrow_forward11) The assembly consists of two blocks A and B which have a mass of 20 kg and 30 kg, respectively. Determine the speed of each block when B descends 1.5 m. The blocks are released from rest. Neglect the mass of the pulleys and cords. Barrow_forward
- 8) The 1000-lb elevator is hoisted by the pulley system and motor M. If the motor exerts a constant force of 500 lb on the cable, determine the power that must be supplied to the motor at the instant the load has been hoisted s = 15 ft starting from rest. The motor has an efficiency of ε = 0.65. 0000arrow_forward7) The spring has a stiffness k = 50 lb/ft and an unstretched length of 2 ft. As shown, it is confined by the plate and wall using cables so that its length is 1.5 ft. A 4-lb block is given a speed VA when it is at A, and it slides down the incline having a coefficient of kinetic friction μk = 0.2. If it strikes the plate and pushes it forward 0.25 ft before stopping, determine its speed at A. Neglect the mass of the plate and spring. Α k = 50 lb/ft 1.5 ft 3ftarrow_forward10) The 30-lb block A is placed on top of two nested springs B and C and then pushed down to the position shown. If it is then released, determine the maximum height h to which it will rise. 6 in. 4 in. kg 200 lb/in. kc 100 lb/in. Barrow_forward
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