The motion of a particle is defined by the relation x= t^2- (t ^2-2)^3, where x and t are expressed in feet and seconds, respectively. determine (a) the two positions at which the velocity is zero (b) the total distance traveled by the particle from t 5 0 to t 5 4 s.
a)Velocity is zero at t=3.535s and t=1.131s.
b) the total distance travelled by particle is 13.888 ft.
What is the known velocity?The displacement that an object or particle experiences with respect to time is expressed vectorially as velocity. The meter per second (m/s) is the accepted unit of velocity magnitude (also known as speed). Alternately, the magnitude of velocity can be expressed in centimeters per second (cm/s).
What is an example of velocity?Velocity can be defined as the rate at which something moves in a specific direction. as the speed of a car driving north on a highway or the pace at which a rocket takes off.
What three categories of velocity are there?The different forms of velocities are uniform velocity, variable velocity, average velocity and instantaneous velocity.
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HURRY :)) In low light, it's _____ to see details, colors, and distant objects. FYI it's ed drivers!!!! A. Easier B. Harder C. Just as easy D. Impossible
Answer:
harder
Explanation:
Answer:
light
Explanation:
4. Oil system cleaning products should not use solvents because:
A) O Solvents smell bad
B) Solvents are completely removed during the service
CO Solvents have no impact on dirt and debris
DO Solvents can damage certain plastics and rubbers found in the engine
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Answer:
Solvents can damage certain plastics and rubbers found in the engine
Explanation:
A site is underlain by a soil that has a unit weight of 118 lb/ft3. From laboratory shear strength tests that closely simulated the field conditions, the total stress parameters were measured to be C total = 250 lb/ft2 and φ total = 29°. Estimate the shear strength on a horizontal plane at a depth of 12 ft below the ground surface at this site in lbs/ sq ft
Answer: the shear strength at a depth of 12 ft is 1034.9015 lb/ft²
Explanation:
Given that;
Weight of soil r = 118 lb/ft³
stress parameter C = 250 lb/ft²
φ total = 29°
depth Z = 12 ft
The shear strength on a horizontal plane at a depth of 12ft
ζ = C + δtanφ
where δ = normal stress
normal stress δ = r × z = 118 × 12 = 1416
so
ζ = C + δtanφ
ζ = 250 + 1416(tan29°)
ζ = 250 + 1416(tan29°)
ζ = 250 + 784.9016
ζ = 1034.9015 lb/ft²
Therefore the shear strength at a depth of 12 ft is 1034.9015 lb/ft²
Which of the following accurately describes how switches and hubs work? (Select two) A. A switch uses the logical addresses in a packet to send it through the correct port to all VLANS defined on that port B. A hub repeats frames to all ports, regardless of the destination address C. Switches use the hardware address in the frame to send it only to the port where the device is located D. A hub uses the hardware address in the frame to forward it to the hosts on the VLAN that corresponds to that address
The following accurately describes how switches and hubs work
C. Switches use the hardware address in the frame to send it only to the port where the device is located.
B. A hub repeats frames to all ports, regardless of the destination address.
The option A is partially correct but not completely. A switch uses the logical addresses in a packet to send it through the correct port to a specific device, not to all VLANs defined on that port. Therefore, options C and B are the most accurate descriptions of how switches and hubs work, respectively.
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The example of using biotechnology in heart surgery is used to illustrate which of the
following points?
Even advances in biotechnology cannot save every life.
There are many life-saving benefits of biotechnology.
The ethical issues in biotechnology do not apply to surgical fields.
The cost of advances in biotechnology is too high to make this care available to
all.
Answer:
There are many life-saving benefits of biotechnology.
Explanation:
Discuss the following statement: "Economists arc predicting that interest rates will
continue to be under 10 percent for at least 15 years.
Answer: That's not true as each year the interest rates are increasing
Explanation:
test equipment for checking the primary circuit is being discussed. technician a says a logic probe can be used. technician b says a dmm can be used. who is correct?
Technician A is correct. Technician B is also correct that a Digital Multimeter (DMM) can be used, as it measures various electrical values like voltage, current, and resistance.
Both technicians are partially correct.
A logic probe can be used to test the primary circuit as it can detect and indicate the presence of logic signals, such as pulses or high/low voltages.
A DMM (digital multimeter) can also be used to test the primary circuit as it can measure voltage, current, and resistance. However, it may not be able to detect the presence of logic signals.
Therefore, it depends on the specific needs and requirements of the testing situation. If logic signals need to be detected, a logic probe would be more appropriate. If voltage, current, and resistance measurements are needed, a DMM would be more appropriate.
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as the angle of the ramp is increased the force parallel increases /decreases / remains the same
As the angle of the ramp is increased, the force parallel increases. Hence, option (a) can be considered as the correct answer.
When the angle of a ramp is increased, the force parallel to the ramp, also known as the parallel component of the gravitational force, does increase. This is because the component of gravity acting parallel to the ramp increases with the angle. However, it's important to note that the total gravitational force acting on an object remains constant regardless of the angle of the ramp.As the angle of the ramp increases, the force required to push or pull an object up the ramp against gravity increases. This is due to the increase in the vertical component of the gravitational force, which opposes the motion up the ramp. The parallel force required to overcome this increased vertical force also increases.
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In literature it is stated that in controlling of a conical tank, PID fails to give fast response because of the non-linearity present in the system. What other type of the controlling methods proposed in the literature? Summarize 1 research article published in one of the peer-reviewed journals. Explain their approach briefly.
Model Predictive Control (MPC) is a control model of a conical tank.
MPC is a control method. It uses a mathematical model of the system to predict its future behavior and optimize control actions accordingly. It is known for its ability to handle non-linear systems effectively.
MPC formulates an optimization problem to determine the control actions that optimize a performance criterion, subject to system constraints. The control actions are computed over a finite time horizon, but only the first control action is implemented. The optimization problem is then solved again at the next time step, taking into account the updated system state.
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Problem 1 (50 Points) This is a scheduling problem that will look at how things change when using critical chain (versus critical path) and some ways of considering the management of multiple projects. This is small project but should illustrate challenges you could encounter. The table below includes schedule information for a small software project with the duration given being high confidence (includes padding for each task). Assume the schedule begins on 3/6/23.
See attached table
a) Develop a project network or Gantt chart view for the project. What is the finish date? What is the critical path? Assume that multi-tasking is allowed. (5 points)
b) Develop a critical chain view of this schedule. Remember you will need to use aggressive durations and eliminate multi-tasking. Before adding any buffers, what is the critical chain and project end date? Now add the project buffer and any needed feeding buffers. What is the end date? (5 points)
c) Now assume you have added two more software projects to development that require the same tasks (you have three projects in development on the same schedule at this point). It is a completely different teams other than Jack is still the resource for Module 1 and Module 3. Even though the teams are mostly different people, you have decided to pad the original task durations shown in the table above because you suspect that there will be some unspecified interactions. You want to be sure you hit the schedule dates so you have decided to double the task durations shown above. So Scope project is 12 days, Analyze requirements is 40 days, etc. Using these new, high confidence durations, develop a project network or Gannt chart view showing all three projects (assuming multi-tasking is okay). What is the finish date? (10 points)
d) We now want to develop a critical chain view of this schedule. You need to use aggressive durations and eliminate multi-tasking. Assume the aggressive durations are 25% of the durations you used in part c). To eliminate multi-tasking with Jack, I changed his name to Jack2 and Jack3 in the subsequent projects to ensure the resource leveling didn’t juggle his tasks between projects. In other words, I want Jack focused on a project at a time. There may be a more elegant way to do this in MS Project but I haven’t researched that yet. Add in the project buffer and any needed feeding buffers. What is the end date now to complete all three projects? (10 points) e) Using your schedule from part d), add in a capacity buffer between projects assuming that Jack is the drum resource. Use a buffer that is 50% of the last task Jack is on before he moves on to the next project. The priority of the projects is Project 1, Project 3, Project 2. What is the end date now to complete all three projects? (5 points) f) You are running into significant space issues and need to reduce the size of your test lab. This means that you can only have 2 projects in test at one time. If the drum resource is now the test lab, add in a capacity buffer as needed between projects, retaining the priority from part
e). Size the buffer and document your assumption for what you did. What is the end date now? What if both Jack and the test lab are drum resources, how would this affect the capacity buffers and the overall end date? (5 points)
g) What observations can you make about this exercise? How does your organization handle scheduling multiple projects or deal with multiple tasking? Write at least a couple of paragraphs. (10 points)
a) The Gantt chart view for the project is shown below. The finish date is April 6, 2023. The critical path is A-B-E-F-H-I-K-L and its duration is 25 days.
What is the critical chain view?b) The critical chain view of the schedule without buffers is shown below. The critical chain is A-C-D-E-G-H-I-J-K-L and its duration is 18 days. Adding the project buffer of 25% of the critical chain duration (4.5 days) and the feeding buffers, the end date is April 10, 2023.
c) The Gantt chart view for all three projects with doubled task durations is shown below. The finish date is May 13, 2023.
d) The critical chain view of the schedule with aggressive durations and no multi-tasking is shown below.
The critical chain is A-C-D-E-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z-AA-AB-AC-AD-AE and its duration is 21 days. Adding the project buffer of 25% of the critical chain duration (5.25 days) and the feeding buffers, the end date is May 23, 2023.
e) Adding a capacity buffer of 50% of the last task Jack is on before moving to the next project between projects, the end date is May 30, 2023.
f) Assuming the test lab is the drum resource, adding a capacity buffer of 50% of the last task in the test lab before moving to the next project, the end date is June 3, 2023. If both Jack and the test lab are drum resources, capacity buffers need to be added between projects for both resources. The overall end date will depend on the size of the buffers added.
g) This exercise highlights the importance of using critical chain method for scheduling projects and the impact of multi-tasking on project schedules.
Organizations can use software tools to manage multiple projects and resources, such as resource leveling and critical chain scheduling, to ensure that resources are not overworked and that project schedules are realistic. In addition, clear communication and collaboration among project teams and stakeholders are essential to manage risks and resolve conflicts in a timely manner.
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In the base of mechanical science knowledge, define work, energy and power
Answer:
Work is the amount of energy transfered by a force.
Energy is the amount of power an object gets from its position or motion.
Power is the combination of all forces and movements of a system that is the rate at which work can be done by a system.
Hotel Fire Safety Directors shall do all EXCEPT:
A. train and supervise Fire Brigade
B. conduct fire drills
C. order full building evacuation of guests
D. distribute applicable parts of the Fire Safety Plan to all employees
Hotel Fire Safety Directors are not authorized to order a full building evacuation of guests. Therefore, option (C) is correct.
Who are Hotel Fire Safety Directors?Hotel Fire Safety Directors are individuals who are responsible for ensuring the safety of guests and employees in the event of a fire emergency in a hotel or other hospitality establishment.
They are typically appointed by the hotel management and must have knowledge of fire safety regulations and protocols, as well as the ability to lead and manage a team during an emergency.
Hotel Fire Safety Directors are responsible for implementing and maintaining the Fire Safety Plan, which includes conducting fire drills, training and supervising the Fire Brigade, and distributing applicable parts of the Fire Safety Plan to all employees. They must also work closely with the local fire department to ensure compliance with local fire safety regulations and protocols.
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The primary hardware component of a computer responsible for routing data and instructions to and from the various components of a computer is the?
The primary hardware component of a computer that is responsible for routing data and instructions to and from the various components of a computer is the: bus.
What is a computer hardware?A computer hardware can be defined as a physical component of an information technology (IT) or computer system that can be seen and touched.
The hardware components of a computer.Some examples of the hardware components of a computer system and these include:
Random access memory (RAM).Read only memory (ROM).Central processing unit (CPU)KeyboardMonitorMouseMotherboard bios chipBusWhat is a data bus?A data bus can be defined as a type of hardware (wire) that is designed and developed so as to enable the transfer (routing) of data across the motherboard of a computer system.
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in mining auxiliary operations are the supplementry steps that support the production cycle . elucidate the auxiliary operations of underground mining?
Answer:
The answer is below
Explanation:
The mining auxiliary operations in underground mining involve various activities that are important for a successful mining operation particularly in the areas of productive operating conditions.
The activities involved in the auxiliary operations in underground mining include the following: ventilation, haulage, drainage, power supply, lighting, delivery of compressed air, water, supplies to the working sections, and communications.
Water that has evaporated returns to earth as
Answer:
rain
Explanation:
evaoration causes clouds
clouds condense and rain
Answer:
rain
Explanation:
what is textile engreering
Answer:
Textile Technologists work with a variety of materials including man-made and natural textiles, leather, fur, plastic and metals. They may be responsible for developing fabrics for furnishings, clothing, household items, medical supplies, or textiles for use within the automotive industry.
Technician A says that the valve guides must be repaired before machining the valve seats. Technician B says that valve seats may be removed and replaced on some cylinder heads. Who is correct
Both Technician A and Technician B can be correct depending on the specific situation and the design of the cylinder head.
In general, when performing valve seat work, it is common practice to repair or replace the valve guides before machining the valve seats. Valve guides provide guidance and support to the valves, and if they are worn or damaged, it can affect the valve's performance and seating.
Technician A is correct in emphasizing the importance of repairing the valve guides before machining the valve seats. This ensures that the valves are properly guided and aligned during the machining process, resulting in accurate and precise valve seat work.
However, Technician B is also correct in stating that on certain cylinder heads, the valve seats can be removed and replaced. Some cylinder heads are designed with removable valve seats, which allows for easier replacement when the seats are worn or damaged. This process involves removing the old valve seats and installing new ones, ensuring a proper sealing surface for the valves.
Ultimately, the correct approach depends on the specific cylinder head design and the condition of the valve guides and seats. It is essential to assess the condition of the valve guides and seats before determining the appropriate course of action, whether it involves repairing the valve guides or replacing the valve seats.
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1. What's an object in your everyday life that has a lot of Kinetic Energy? How do you know it has a lot?
"Something that has a lot of Kinetic Energy is _____. I know this because..."
2.What's an object in your everyday life that has a lot of Potential Energy? How do you know it has a lot?
"Something that has a lot of Potential Energy is _____. I know this because..."
Answer:
. What's an object in your everyday life that has a lot of Kinetic Energy? How do you know it has a lot?
"Something that has a lot of Kinetic Energy is a plane and a baseball . I know this because the baseball gets energy to it when its thrown which is giving in kinetic energy".
2.What's an object in your everyday life that has a lot of Potential Energy? How do you know it has a lot? "an object that has a lot of potential energy is Water that is behind a dam. A car that is parked at the top of a hill. A yoyo before it is released. I know this because
the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors."
a what type of contact is used with the High pressure switch?
how do the brushes control the amount of charging an alternator does
Explanation:
Think of brushes as a sliding contact.
In an alternator the brushes provide power to the field coil which is physically mounted on the rotating shaft. They provide this direct current through two slip rings.
By controlling the power flow to the field, the power output of the alternator can be controlled. A regulator circuit is used to control the field so that the output voltage is maintained to about 13.5 to 14.5 VDC.
FUN FACT: Many brush holders have a small holes near the brush exit. When you assemble the alternator you physically push the brushes all the way into their holder and then thread a small wire through these hole. After the alternator is assembled you can pull the wire out and the brushes will snap into position.
In poor weather you should___ your following distance
gasoline has a comparatively high btu per galloon rating around?
Answer:
116,090 Btus
Explanation:
A laminated steel ring is wound with 3000 turns. When the magnetism current varies between 7 and 9 A, the magnetic flux varies between 860 and 900Nwb, calculate the incremental inductance of the coil over this range of current variation
Answer:
60000 H
Explanation:
We are given;
Number of turns; N = 3000 turns
Change in flux = 900 - 860 = 40 Wb
Change in current = 9 - 7 = 2 A
Now, the formula for incremental inductance is given as:
L = N(Change in flux/Change in current) where;
N is Number of turns
Plugging in the relevant values, we have;
L = 3000(40/2)
L = 60000 H.
list the components of a typical Foundation drainage system and their functions.
Explanation:
In this series, the professionals at the B.O.L.D. Company will take you through the process of building a custom home in the Greater Cincinnati – Northern Kentucky area. From plan and lot selection, to mortgage approval, to the actual construction, we’ll take you behind-the-scenes each week for an inside look at a different part of the process.
Mercury at 25°C flows over a 3-m long and 2-m wide flat plate maintained at 75°C with a velocity of 0.8m/s. Determine the rate of heat transfer from the entire plate. Ans: 642.4kW Mercury V-0.8 ms 7. = 25°C 7,70
The rate of heat transfer from the entire plate is 642.4 kW.
To determine the rate of heat transfer, we can use the formula for convective heat transfer, which is given by Q = h * A * ΔT, where Q represents the rate of heat transfer, h is the convective heat transfer coefficient, A is the surface area of the plate, and ΔT is the temperature difference between the plate and the surrounding fluid.
In this case, the plate is maintained at 75°C, while the mercury flowing over it is at 25°C. The plate has a length of 3 m and a width of 2 m, so the surface area A is 3 m * 2 m = 6 m².
The convective heat transfer coefficient, h, would depend on the specific conditions of the flow and the properties of mercury. Without additional information, we cannot determine the exact value of h. However, once we have the value of h, we can calculate the rate of heat transfer using the formula Q = h * A * ΔT.
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some connecting rods have ____ to help lubricate the cylinder wall or piston pin.
Answer:
some connecting rods have spit holes
Some connecting rods have crankshaft to help lubricate the cylinder wall or piston pin.
What are crankshaft?A crankshaft is a mechanical component that converts reciprocating motion in a piston engine into rotational motion.
The crankshaft is a rotating shaft with one or more crankpins that drive the pistons via the connecting rods.
Reduced fuel economy is one issue you'll face if your car's crankshaft isn't working properly. The reason for this is that your vehicle's fuel injectors will not efficiently direct gas to the engine.
The connecting rods' big ends are lubricated with oil that travels up an oilway drilled through the crankshaft.
From the main bearings to the big end bearings, oil is pushed. It will lubricate the cylinder walls in some engines by passing through a passage drilled in the connecting rod.
Thus, the answer is crankshaft.
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A specimen of steel having an initial diameter of 0.503 in was tested in tension using a gauge length of 2 in. The following data were obtained for the elastic and plastic states: Elastic State Load P lbf Elongation in 1 000 0.0004 2 000 0.0006 3 000 0.0010 4 000 0.0013 7 000 0.0023 8 400 0.0028 8 800 0.0036 9 200 0.0089 Plastic State Load P lbf Area A; in? 8 800 0.1984 9 200 0.1978 9 100 0.1963 13 200 0.1924 15 200 0.1875 17 000 0.1563 16 400 0.1307 14 800 0.1077 Note that there is some overlap in the data. (a) Plot the engineering or nominal stress-strain diagram using two scales for the unit strain , one scale from zero to about 0.02 in/in and the other scale from zero to maximum strain. (6) From this diagram find the modulus of elasticity, the 0.2 percent offset yield strength, the ultimate strength, and the percent reduction in area. (C) Characterize the material as ductile or brittle. Explain your reasoning. (d) Identify a material specification from Table A-20 that has a reasonable match to the data.
400 x 8 = 50, 40,000 x 800 = 50, and 40,000 x 80 = 500 will be the correct formulae. Then C, D, and E are the appropriate choices.
A fraction number is a number that denotes a portion of an entire number, where the entire number itself can be any integer. It takes the shape of a denominator and a numerator. Let's examine each option, and then we have A. 400 ÷ 80 ≠ 50 B. 4, 000 ÷ 80 ≠ 5 C. 400 ÷ 8 = 50 D. 40,000 ÷ 800 = 50 E. 40,000 ÷ 80 = 500. 400 x 8 = 50, 40,000 x 800 = 50, and 40,000 x 80 = 500 will be the correct formulae. Then C, D, and E are the appropriate choices. The maximum stress on the stress vs. strain graph corresponds to the tensile strength, which can be roughly calculated at 370Mpa (complete plot)
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commonly used with cable modems and television, what is the typical impedance of this type of coaxial cable in ohms?
The two primary coaxial cable kinds are those with an impedance of 75 Ohm () and those with an impedance of 50 Ohm. While 50 Ohm cables are typically used for the data and wireless communications, 75 Ohm cables are typically utilized for video signals.
What is the typical value of coaxial cable impedance?The majority of RF Coaxial Cables have impedances of 50 or 75 ohms. These are regarded as established impedance levels with accessible cables.
Which coaxial fitting is most frequently used for cable TV?For example, the industry standard for a television coax connection is an F-type connector.
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10. Atmospheric scientists study weather patterns.
True
False
Answer:
True
Explanation:
Atmospheric science is studying of the Earth's atmosphere. Meteorology includes atmospheric chemistry and atmospheric physics with a major focus on weather forecasting.
Answer:
The other person is Correct the answer is true
Explanation: