Answer:
Option A. Both Technicians A and B
Explanation:
Both technicians are correct. There are fundamentals that have to be understood regarding cooling systems.
The cooling system depends on a thermodynamic system that involves the expansion and compression of the cooling fluid. In addition, the coolant is the one that circulates in the pipes influencing convention currents between the pipes (coiled pipes) or otherwise. It is noteworthy that the dryer be kept out of the reach of moisture as this will corrode. Therefore, a drier that comes in contact with moisture needs to be replaced as this brings about corrosion.
In addition, it is also very important to remove the refrigerant from the system so that there will not be extreme fluctuations in temperature and pressure. In order to be on the safe side, the refrigerant needs to be replaced.
Final answer:
Both Technician A and Technician B are correct regarding AC system maintenance. Technician A advises replacing the drier after long exposure, while Technician B recommends making repairs before evacuating the refrigerant. Budgeting 1.1 hours of service time may need to be re-assessed based on statistical analysis.
Explanation:
The question seems to pertain to the maintenance and repair practices associated with air conditioning (AC) systems, touching on subjects like cooling system exposure, drier replacement, and refrigerant evacuation. Technician A advises that a drier should be replaced if the cooling system has been exposed to air for more than 24 hours. This is generally correct because prolonged exposure to moisture can contaminate the drier, which is tasked with absorbing moisture in the system. On the other hand, Technician B suggests that repairs should be made before refrigerant is evacuated. This is also generally correct as it prevents wasting refrigerant and ensures that any leaks or issues are dealt with prior to recharging the system. Therefore, the correct answer is that both technicians are correct.
When it comes to air conditioner maintenance, as described in the reference, understanding the average servicing time and standard deviation is crucial for planning and resource allocation. Budgeting 1.1 hours per technician based on the company's service records may or may not be sufficient depending on the actual time taken to service units, which varies according to a normal distribution. If the normal distribution assumption holds, using the mean and standard deviation provided, one can use statistical analysis to determine the probability that the average service time will exceed 1.1 hours.
In AC systems, the condenser is the component responsible for converting gaseous refrigerant back into a liquid form. This process releases the absorbed heat to the outside environment.
The efficacy of an air conditioner is often measured in terms of its thermal energy removal capacity, with common units being watts or BTU/hr. AC systems can be categorized as vapor compression systems, vapor absorption systems, and open-loop evaporative systems, all of which use the evaporation of fluid to remove heat from the air.
Two identical charges, each -8.00 E-5 C, are separated by a distance of 20.0 cm (100 cm = 1 m). What is the force of repulsion? Coulomb's constant is 9.00 E9 N*m2/C2
Remember to identify all data (givens and unknowns), list equations used, show all your work, and include units and the proper number of significant digits to receive full credit.
Answer:
1440 N
Explanation:
The electrostatic force between the two charges is given by:
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
where:
[tex]k=9.00 \cdot 10^9 N m^2 C^{-2}[/tex] is the Coulomb's constant
[tex]q_1 = q_2 = -8.00 \cdot 10^{-5} C[/tex] is the value of each charge
r = 20.0 cm = 0.20 m is the separation between the charges
Substituting numbers into the equation, we find
[tex]F=(9\cdot 10^9 N m^2 C^{-2} )\frac{(-8.00 \cdot 10^{-5}C)^2}{(0.20 m)^2}=1440 N[/tex]
disadvantages and advantages of digit and analog signals
Answer:
Pros and Cons of Analog Signals: Advantages: major advantages of the analog signal is infinite amount of data. Density is much higher. easy processing. Disadvantages: Unwanted noise in recording. If we transmit data at long distance then unwanted disturbance is there.
Explanation:
Answer:
Pros and Cons of Analog Signals: Advantages: major advantages of the analog signal is infinite amount of data. Density is much higher. easy processing. Disadvantages: Unwanted noise in recording. If we transmit data at long distance then unwanted disturbance is there.
Explanation:
which air mass would produce warm,humid weather in the summer?
Answer:
Maritime tropical
Explanation:
The maritime tropical air mass typically produce warm, humid weather in the summer.
Answer:
The correct answer is the maritime tropical air masses.
Explanation:
These air masses are loaded with moisture with the water on which they are produced and heated as well. These air masses are form over the ocean in the hot areas of the Gulf of Mexico and the tropics.
Later they move towards the north, which brings an increase of humidity and hot winds to the United States. This phenomenon generates an increase in the probability of rains and generally occurs in the summer season in the southern states of the country. But nevertheless they can be formed throughout the year.
I dont get how to do the electron cloud model, can someone please tell me how in simple words. I have been lost and dont know anything on how to do the electron cloud model.
Answer:
whats the question
Explanation:
Water that contains a larger than normal amount of __________ is still safe to drink.
a. sulfur b. arsenic c. lead d. magnesium
Answer:
Water that contains a larger than normal amount of magnesium is still safe to drink.
Explanation:
Sulfur, lead and arsenic are harmful metals that are toxic to human health. Although magnesium present at high concentrations (above approximately 250 mg/l each) can have a laxative effect. However, data suggest that consumers adapt to these levels as exposures continue.
Answer:magnesium
That's the answer
Which are the main regions of the periodic table? A. metals, nonmetals, gases B. solids, liquids, gases C. metals, semimetals, nonmetals
Answer:
the answer is C.
Explanation:
Answer:
On Edge it is A, D, E.
Explanation: Have a nice day
How much work is done when a force of 15.0 newtons is used to lift a box 3.0 meters into the air?
0.0 J
3.0 J
15.0 J
45 J
Added potential energy = (mass) x (gravity) x (height)
or
Added potential energy = (weight) x (added height)
If you need to lift a 15N box 3m straight up, you have to increase its potential energy by (15 N) x (3 m) = 45 Joules .
Where is that added potential energy supposed to come from ? You could use an electric winch, a steam engine, a gasoline-powered motor, thousands of hamsters running on little treadmills that are are connected to the main pulley somehow, or your own arm muscles. But howEVER you do it, you have to provide 45 Joules of WORK in order to increase the potential energy of the box by just that much.
Which appliance uses more energy?
-- the CD player . . . . . 3,924,000 joules
-- the blender . . . . . 36,000 joules
-- the hair dryer . . . . . 270,000 joules
-- the computer . . . . . 7,200,000 joules
The computer is the big loser, mainly because it was left turned on for so long.
Answer:
The computer uses more energy.
Explanation:
We know that the power of an electrical appliance is given by :
[tex]P=\dfrac{E}{t}[/tex]
[tex]E=P\times t[/tex]
E is the energy of the appliance
t is the time taken
For CD player :
Power = 30 watts
Time, t = 3 hours = 10800 s
[tex]E=30\times 10800[/tex]
E = 324000 Joules
or E = 324 kJ
For blender :
Power = 300 watts
Time, t = 2 hours = 120 s
[tex]E=300\times 120[/tex]
E = 36000 Joules
or E = 36 kJ
For hair dryer:
Power = 1500 watts
Time, t = 3 minutes = 180 s
[tex]E=1500\times 180[/tex]
E = 270000 Joules
or E = 270 kJ
For computer:
Power = 200 watts
Time, t = 10 hours= 36000 s
[tex]E=200\times 36000[/tex]
E = 7200000 Joules
or E = 7200 kJ
So, the computer uses more energy i.e. 7200 kJ. Hence, the correct option is (d).
A value that describes how heavy an object is and is related to the force of gravity is
Answer:
mass
Explanation:
The heaviness of an object with the relation to force of gravity, is described by the ‘weight’
Explanation:
The heaviness of the object is referred to the mass of the object. When the mass of the object is concerned it is taken in space or vacuum where force of gravity do not exist.
Therefore, to value the actual heaviness of the object, mass is multiplied by the component of force of gravity, is termed as weight.
[tex] \bold{\text { Weight }=\text { Mass } \times \text { Accleration due to gravity }} [/tex]
In the realm of scientific inquiry, making an observation typically leads to ___.
A. Developing a theory
B. Asking a question
C. Conducting experiments
D. Testing a hypothesis
Answer:
The correct answer will be option-B.
Explanation:
A scientific method is a systematic approach to understand and explain any natural phenomenon of nature.
The method involves various steps which begin with making an observation followed by asking a question which could have real answers and could be tested through scientific experiments. Based on the question background research is done and a hypothesis is proposed to which could be proved or disproved through the experiments.
Thus, Option-B is the correct answer.
A 1,160 kg satellite orbits Earth with a tangential speed of 7,446 m/s. If the satellite experiences a centripetal force of 8,955 N, what is the height of the satellite above the surface of Earth? Recall that Earth’s radius is 6.38 × 106 m and Earth’s mass is 5.97 × 1024 kg.
Answer: The height of the satellite above the surface of Earth is [tex]8.02\times 10^{5}m[/tex]
Explanation:
Given
Mass of the satellite, m= 1160 kg
tangential speed , v = 7446 m/s
Centripetal force , F = 8955 N
Radius of earth , R= [tex]6.38\times 10^{6}[/tex] m
Let height of satellite above surface of the Earth be H
Centripetal force on satellite is given by
[tex]F=\frac{mv^{2}}{R+H}[/tex]
=>[tex]H=\frac{mv^{2}}{F}-R[/tex]
=>[tex]H=(\frac{1160\times 7446^{2}}{8955}-6.38\times 10^{6}) m=8.02\times 10^{5}m[/tex]
Thus the height of the satellite above the surface of Earth is [tex]8.02\times 10^{5}m[/tex]
Answer:
8.02 x 10^5 m
Explanation:
8.02 x 10^5 m
What is the oxidation state of rubidium (Rb)?
Answer:
The answer is rubidium exhibits +1 and -1 oxidation states.
Explanation:
Rubidium is a reactive element and belongs to the group 1 of the periodic table. It is an alkali metal and it is a highly reactive element.
Rubidium is a very soft and white lustrous element. Rubidium has +1 and -1 oxidation states. When rubidium is burnt, it forms oxides, superoxides and peroxides respectively.
For example, in rubidium oxide (Rb2O), Rubidium has a +1 oxidation state. While in peroxides rubidium exhibits -1 oxidation state. For example Rubidium peroxides (Rb2O2).
The Mariana Trench is the deepest ocean trench on. This trench occurs at a plante boundary where
The Mariana Trench is the deepest ocean trench, located at a convergent plate boundary in the abyssal zone with depths reaching about 11,000 meters. High pressure, low nutrient content, and lack of light characterize this zone, where chemosynthetic bacteria at hydrothermal vents form the base of the food chain.
Explanation:The Mariana Trench is known as the deepest ocean trench, residing at a depth that places it within the abyssal zone. This trench is located at a convergent plate boundary, a region where oceanic plates meet and one is forced beneath the other, creating a subduction zone. The Challenger Deep, within the Mariana Trench, reaches about 11,000 m (approximately 6.8 miles) deep. At these depths, there is high pressure and low nutrient content, and no light penetrates to allow photosynthesis. Therefore, organisms such as chemosynthetic bacteria form the base of the food chain, utilizing minerals from hydrothermal vents for energy.
if you leave a fan on in a room even if its not pointed towards the person, does the room still get cooler?
A fan never 'cools' a room. It has no way to change the temperature of anything.
A fan does nothing but MOVE air, and air that's MOVing FEELS cooler on human skin than air that's NOT moving, even at the same temperature. Non-living objects, and most animals, don't feel any difference on account of a fan.
It doesn't matter whether the room is open or closed. If the air in the room is moving, then a PERSON in the room will FEEL cooler than if the air is not moving.
Answer:
no the room does not change temperature
What is force and matter plz answer
Hello There!
A force is simply just a pull or a push on an object. It’s measured in Newtons “N”
Matter is anything that has mass and it takes up space. This is also known as volume
Explanation:
FORCE:
force is any interaction that, when unopposed, will change the motion of an object.
MATTER:
anything which have mass and occupies space in air is known as Matter
Which of the following examples illustrates static friction?
A box sits stationary on a ramp.
A ball rolling on the lawn eventually comes to rest.
A car rounds a curve on a road.
A fish swims upstream.
Answer:
A box sits stationary on a ramp
Explanation:
Static friction is a force which keeps an object at rest as it is in the case of the box. It has to be overcome for the object to be set into motion.
Static force of friction is calculated as follows:
F= μη
F is static force of friction.
μ is the coefficient of static friction.
η is the normal force.
what information does a free body diagram show
Answer:
show the relative magnitude and direction of all forces acting upon an object
Explanation:
A free body diagram shows all the forces acting on a body. It gives the magnitude and direction of the number of forces acting on an object when it is in equilibrium.
For example,
When a force applied to an object is F. The force of friction also acts on it in opposite direction. Its weight is also acting in vertically downward direction. One normal is also acting on it.
It shows that all type of forces acting on the object i.e. normal force, gravitational force, frictional force and the applied force.
in an exothermic chemical reaction the energy gained by the surroundings must be _______ the energy lost by the reaction
Most be equal to the energy lost by reaction
The energy gained by the surroundings must be greater than the energy lost by the reactants in an exothermic reaction.
Explanation:
Exothermic reaction is a chemical reaction in which the energy from the reaction is transferred to the surroundings and so the products and the reactants in the reaction have lesser energy compared to the energy gained by the surroundings.
For example, thermal decomposition of compounds in carbonates. So it must be greater than the energy that is lost by the reactants in an exothermic reaction.
Which of these metals are magnetic?
Answer:
If iron, nickle, or cobalt is an answer choice, those are the three metals that are purely magnetic.
WILL MAKE YOU BRAINLIEST PLEASE ANSWER THIS!!!!!
How do scientists determine motion of objects in the universe?
A) big bang theory
B) Doppler effect
C) heliocentric theory
D) geocentric theory
Answer:
B) Doppler effect
Explanation:
Scientists use the Doppler effect to determine motion of objects in the universe.
Answer:
B) Doppler effect
Explanation:
Think about the tools scientists use to collect evidence.
Here is proof that my answer is correct:
Identify some abiotic characteristics of the tundra biome.
using second law of motion derive the relation between force and acceleration
Answer:
f=ma
Explanation:
According to second law of motion Force is directly proportional to rate of change of momentum.
so F is directly proportional to [tex]\frac{dp}{dt}[/tex]
we know that momentum P= MV
so
[tex]f=d(mv)/dt=m\frac{dv}{dt}[/tex]
thus we get F=ma.
Answer:
Let F be external force applied on the body in the direction of motion of the body for time interval [tex]\sf \Delta t[/tex], the the velocity of a body of mass m changes from [tex]\sf v [/tex] to [tex]\sf v + \Delta v[/tex] i.e. change in momentum, [tex]\sf \Delta p = m \Delta v [/tex].
According to Newton's second law :
[tex]:\implies \sf F \propto \dfrac{\Delta p}{\Delta t} \\ \\ \\ [/tex]
[tex]:\implies \sf F = k \: \dfrac{\Delta p}{\Delta t} \\ \\ \\ [/tex]
Where k is a constant of proportionality.
If limit [tex]\sf \Delta t \rightarrow 0,[/tex] then the term [tex]\sf \dfrac{\Delta p}{\Delta t}[/tex] becomes the derivative [tex]\sf \dfrac{dp}{dt}[/tex].
Thus,
[tex]:\implies \sf F = k \: \dfrac{dp}{dt} \\ \\ \\ [/tex]
For a body of fixed mass (m), we have :
[tex]:\implies \sf F = k \dfrac{d(mv)}{dt} \\ \\ \\ [/tex]
[tex]:\implies \sf F = km \: \dfrac{dv}{dt} \\ \\ \\ [/tex]
[tex]:\implies \sf F = kma \\ \\ \\ [/tex]
If v is fixed and m is variable then :
[tex]:\implies \sf F = \dfrac{kd(mv)}{dt} \\ \\ \\ [/tex]
[tex]:\implies \sf F = \dfrac{kvdm}{dt} \\ \\ \\ [/tex]
because, k = 1 then :
[tex]:\implies \sf F =\dfrac{vdm}{dt}[/tex]
Now, a unit force may be defined as the force which produces unit acceleration in a body of unit mass :]
So,
F = 1
m = 1
a = 1
k = 1
So,
[tex]:\implies \underline{ \boxed{ \sf F = ma}}[/tex]
What can you conclude about the oceanic crust in the image?
A. It's denser than the continental crust. B. It sits at a higher elevation than the continental crust. C. It exerts no upward force on the continental crust. D. It's composed mostly of granitic rock.
Answer: Option (A)
Explanation: In the picture given below, we could see two plates colliding one another. The denser oceanic plate is getting subducted beneath the other and there occurs a trench which lies relatively at a lower elevation than the continental crust.
The oceanic crust usually is composed of basalt and it does not exert any upward force towards the continental crust.
Groups of organs that work together to complete a process in the body are called:
A. cells
B. tissues
C. nerves
D. systems
Answer:
systems
Explanation:
they are a bunch of things functioning together
Answer:
D. systems, termed as "organ system".
Explanation:
The organ system is a system that consists of a group of organs that work together to ensure that the organism continues to survive.
Tissues are next in creating the specific organs, and are generally classified depending on the organ it is part of. Note that not all tissues are the same.
Cells are "the smallest", and groups of cells create tissues.
Nerves are part of the Nervous system, which helps provide sensory to the body to help react when the body comes into contact with something that may hurt body parts.
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how do you find the net force acting on an object?
a- find the reaction force
b- assume there is no friction
c- add all the force vectors
d- find the largest force on the object
Answer:
C. Add all the force vectors
Explanation:
The net force acting on an object is the vector sum of all the forces on the object.
Remember, Newton's first law tells us a body at rest will remain at rest or that in uniform motion will continue in motion unless acted by unbalanced forces.These unbalanced forces act in all direction towards the body thus to get the net force you require a summation of all these force with respect to their magnitudes and directions.
For example a force of 3N towards the East direction acting on a body and another force of 2N towards the West direction on the same body will generate a net force of 1N towards the East direction.
Final answer:
To find the net force acting on an object, one must add all the force vectors using both the x- and y-components to generate an accurate answer.
Explanation:
To find the net force acting on an object, one must add all the force vectors acting on the object (option c). This is known as the vector sum of all the forces or the net force in the x-direction or y-direction, depending on the orientation of the forces. When forces are at an angle, it's important not to forget about the x-components. Creating a free body diagram can help visualize and calculate the forces.
It’s essential to break down angled forces into their x- and y-components and then combine these components from all forces to generate an accurate answer for the net force.
For example, consider the free-body diagram of a shopping trolley. To find the resultant, or net force, one would draw all forces acting on the trolley, including its weight, normal force, friction, and any applied forces.
Then, after dividing any angled forces into their horizontal and vertical components, all forces in each direction are summed to find the net force in each direction, and from these, the overall net force on the trolley.
It's also important to understand that the net force is related to an object's acceleration, as per Newton's second law of motion, Fnet = ma, where Fnet is the net force, m is the mass of the object, and a is the acceleration.
Heidi and Heather take a 30 minute walk eastward along a straight road to a store 2.0 km away. What is their average velocity in m/s?
Average velocity =
(distance and direction of their change in location)
divided by
(time for the change) .
Distance and direction of their change in location = 2.0 km east (their "displacement")
Time for the change = 30 minutes
Average velocity = (2.0 km east) / (30 minutes)
Average velocity = (2/30) (km east/minute)
Average velocity = 0.067 km/min east
or
Average velocity = 4.0 km/hr east
Just to be difficult, the question specifies that the answer must be given in units of m/s. Is no problema for nosotros:
Average velocity = (4.0 km-east/hour) x (1,000 m/km) x (1 hour/3600 sec)
Average velocity = (4 x 1,000 / 3,600) (km-east-meter-hr / hr-km-sec)
Average velocity = 1.111... m/s East
Answer:
thanks for the asnwer
Explanation:
Suppose a balloon was tied to a pole. What happens?
Answer:
it wont fly away
Explanation:
depending how tight the knott and find it is going to be stuck to the pole
A balloon sticks to a sweater due to static electricity, and hair stands up when brought near a charged balloon. A helium balloon moves with the wind, so a flag will not wave unless there's a change in motion. Hot air balloons rise because of a buoyant force, and releasing a filled balloon demonstrates Newton's third law of motion.
The phenomenon of a balloon sticking to a sweater after being rubbed against it is explained by static electricity. When the balloon is rubbed against the sweater, electrons are transferred from the sweater to the balloon, giving the balloon a negative charge and the sweater a positive charge. Due to the attraction between opposite charges, the balloon sticks to the sweater. Bringing the charged balloon close to your hair, which has a neutral charge, will result in your hair standing up due to the attractive force exerted by the balloon's excess electrons.
When you bring a candle close to a balloon, the heat may cause it to pop, resulting in a loud bang. If you are a passenger in the open basket hanging under a helium balloon, and the balloon is being carried along by the wind at a constant velocity, a flag held in your hand will not wave because you, the flag, and the balloon are all moving at the same velocity relative to the wind. However, if there is a gust of wind or an acceleration of the balloon, the flag might wave in the opposite direction of the wind or acceleration.
Hot air balloons rise because the hot air inside is less dense than the surrounding cooler air, creating a buoyant force. This principle is also used in the take-home experiment involving a balloon filled with air or water. When released, the balloon propels in the opposite direction of the expelled air or water, demonstrating Newton's third law of motion: for every action, there is an equal and opposite reaction.
On a hypothetical scale X The ice point is 40° and steam point is 120°.
For another scale Y the ice point and steam points are -30° and 130° respectively if X reads 50° The reading of Y is?
Answer:
The reading of Y is -10°.
Explanation:
For scale X, the ice point is 40° and steam point is 120°.
Difference between the two extremes for scales X = 120 - 40 = 80
For scale X, the ice point and steam points are -30° and 130° respectively.
Difference between the two extremes for scales X = 130 - (-30) = 160
Comparing both scales:
One unit of scale X = x
One unit of scale Y = y
Scale X has 80 divisions while scale Y has 160
80x = 160y
x = 2y
50° in scale X = 10x + ice point in X scale
10 divisions in Y scale = 20y
Reading of Y scale = ice point of Y + 20y
= -30° + 20°
= -10°
Which of the following is a benefit of globalization?
Globalization facilitates international trade, leading to increased wealth, better and less expensive products for consumers, and higher incomes for employees of successful businesses. It also creates international awareness and serves as a political counterbalance to domestic protectionism.
Explanation:One of the key benefits of globalization is the potential for increased wealth across nations. Through reductions in tariffs, quotas, and other trade barriers, as well as improved transportation and communication technologies, globalization has driven down costs. This has facilitated international trade, allowing consumers to enjoy better and less expensive products and businesses to tap into larger markets, thereby increasing their profits. Employees of these successful businesses can also benefit from higher incomes.
Another advantage is the creation of international awareness and empowerment, promoting cultural exchange and international cooperation. Lastly, international agreements and treaties can act as a counterweight to domestic special interest groups, helping to prevent protectionist policies that could otherwise harm global economic progress.
A 3500 W motor does 8000 J of work when it lifts a Rhinoceros 30.0 m. How long did this take?
Answer:
The answer is 2.28 seconds
Explanation:
Given data:
Work done = 8000J
Distance , d = 30 m
Power , P =3500 W
We know that
(a) Work done = force × distance
8000 J = F x 30 m
F = 8000 J / 30 m
= 266 N
(b) Power = work done / time taken
3500 W = 8000 J/ time taken
3500 W x time taken = 8000 J
Time taken = 8000 J / 3500 W =2.28 s