It takes 5,302.4 seconds (or about 1 hour and 28 minutes) for the refrigerator to remove 400 kJ of energy if this is the only cooling load.
To determine the time required for the refrigerator to remove 400 kJ of energy, we need to calculate the efficiency of the Carnot cycle and then use it to determine the total energy supplied by the motor-compressor over that time period.
The efficiency (η) of a Carnot cycle is given by the formula:
η = 1 - (Tc/Th)
where Tc is the absolute temperature of the cold reservoir and Th is the absolute temperature of the hot reservoir.
Given that the temperature range of the Carnot cycle is from -15°C to 45°C, we need to convert these temperatures to Kelvin:
Tc = 273 + (-15) = 258 K
Th = 273 + 45 = 318 K
Now we can calculate the efficiency:
η = 1 - (258/318) = 0.1887
The efficiency represents the fraction of energy that is effectively used by the refrigerator. So, the total energy supplied by the motor-compressor (W) can be calculated by dividing the energy required to remove (Q) by the efficiency:
Q = 400 kJ = 400,000 J
W = Q / η = 400,000 J / 0.1887 = 2,120,953 J
Since power (P) is defined as energy (W) divided by time (t), we can rearrange the equation to solve for time:
t = W / P = 2,120,953 J / 400 W = 5,302.3825 seconds
Therefore, it would take approximately 5,302.4 seconds (or about 1 hour and 28 minutes) for the refrigerator to remove 400 kJ of energy if this is the only cooling load.
For more such questions on cooling load,click on
https://brainly.com/question/14246206
#SPJ11
2. At 6:00 AM a hopital ued it cyclotron to make 1 milligram of the iotope fluorine-18 for ue a a diagnotic tool with it PET canner. The half-life of F-18 i 1. 8 hour. How much F-18 i left at 3:00 PM? At midnight? Should the hopital plan to make more F-18 the next morning?
Cyclotron to make 1 milligram of the isotope fluorine-18 for use a a diagnostic tool with it PET scanner. It seems that the hospital should plan to make more F-18 the next morning, as the amount remaining at midnight is very small.
The half-life of F-18 is 1.8 hours, so after 1.8 hours, half of the original amount of F-18 will remain. After 3.6 hours, a quarter of the original amount will remain, and so on.
At 3:00 PM (9 hours after the F-18 was made), the hospital will have
= 1/2^(9/1.8)
= 1/2^5
= 1/32
= approximately 0.03125 milligrams of F-18 remaining.
At midnight (18 hours after the F-18 was made), the hospital will have
= 1/2^(18/1.8)
= 1/2^10
= 1/1024
= approximately 0.0009765625 milligrams of F-18 remaining.
While using cyclotron, based on these calculations, it seems that the hospital should plan to make more F-18 the next morning, as the amount remaining at midnight is very small.
To know more about cyclotron please refer: https://brainly.com/question/13222444
#SPJ4
Topics:
1. Explain the causes of ocean currents around the world.
Refer to at least 2 types of heat transfers.
Refer also to the specific heat capacity of the substances involved.
2. Explain features of a thermal food container that can help to keep food
warm.
Refer to at least 2 types of heat transfers.
Refer also to the specific heat capacity of the materials used.
I need you to make me an invented poem written please not in image
What will happen to a balloon filled with air when you cool the balloon in ice
Answer:
the volume of balloon decreases by the lower temperature because the gas inside is cool downwhat happens to the current in a circuit if a 1.5 volt battery is removed and is placed by a 9 volt battery?
Answer:
The current would increase.
Explanation:
The current would increase. 10. The relationship between resistance and current in a circuit is that the greater the resistance the less the current and the greater the current the less the resistance is.
if a 1.5-volt battery is removed and placed by a 9-volt battery in a circuit, From Ohm's law we can say that the current flow inside the circuit will increase because the voltage increases (resistance remains constant).
What is Ohm's law?Ohm's Law is a fundamental law of physics that describes the relationship between the three basic electrical quantities: voltage, current, and resistance in a circuit.
It states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. Mathematically, Ohm's Law is expressed as:
V = I x R
Where:
V = the voltage or potential difference between two points in the circuit, measured in volts (V).
I = the current flowing through the circuit, measured in amperes (A).
R = the resistance of the conductor, measured in ohms (Ω).
In other words, the voltage (V) across a circuit component is equal to the product of the current (I) flowing through the component and its resistance (R). This law is applicable to both DC (direct current) and AC (alternating current) circuits, as long as the resistance is constant.
Ohm's Law can be used to calculate any one of the three variables if the other two are known. For example, if the voltage and resistance in a circuit are known, the current flowing through the circuit can be calculated using the formula:
I = V / R
Here in the question,
The current in a circuit is determined by the resistance of the circuit and the voltage applied to it, according to Ohm's Law. If a 9-volt battery replaces a 1.5-volt battery, the voltage applied to the circuit will increase, which may cause an increase in the current flowing through the circuit if the resistance remains the same.
However, the increase in voltage may also cause an increase in the heat generated by the circuit, which could potentially damage the components or cause a safety hazard. Therefore, it is important to ensure that the components in the circuit can handle the higher voltage before replacing the battery.
It's also important to note that the current may also depend on the internal resistance of the batteries. A 9-volt battery typically has a lower internal resistance than a 1.5-volt battery, which means it can supply more current to the circuit. So, even if the resistance of the circuit remains the same, the current may still increase due to the higher voltage and lower internal resistance of the 9-volt battery.
Hence, The current flowing through the circuit increased when we removed a 1.5-volt battery and replaced it with a 9-volt battery.
To learn more about Ohm's Law click:
https://brainly.com/question/1247379
#SPJ2
HELP PLZ!!!!!
Why do things get classified as"hot" or "cold"?
Answer:
Heat flows from higher to lower temperature. So when you keep hot things in normal temperature, the heat from hot object transfers to the environment until they are both on the same level. Same happens when a cold object is kept in normal room temperature, the heat from the environment transfers to the cold object until they are both equal. its all about achieving the equilibrium in a system
The burning of a log releases the logs chemical_energy into other forms of energy
Answer:
When we burn wood we are releasing solar energy, in the form of heat, that has been stored in the wood as chemical energy. The process of photosynthesis converted solar energy, water and carbon dioxide into oxygen and the organic molecules that form the wood, half the weight of which is carbon.
Explanation:
what was kobes passion for sports
When you create a best fit line what is the expected value of the slope?
When you create a best-fit line, the expected value of the slope represents the average rate of change in the dependent variable (y) for every unit increase in the independent variable (x). The slope helps you make predictions and understand the relationship between the two variables in your dataset.
When you create a best-fit line, the expected value of the slope is the coefficient that represents the rate of change between the two variables being analyzed. The slope is determined by finding the ratio of the change in the dependent variable to the change in the independent variable.
It is important to note that the slope of a best-fit line is not always a perfect representation of the true relationship between the variables, but rather an approximation based on the available data. Therefore, the expected value of the slope is subject to variation and uncertainty depending on the specific data set and methodology used to create the best-fit line.
learn more about dependent variables here: brainly.com/question/383055
#SPJ11
Which statement describes what happens to rocky shorelines that absorb
energy from ocean waves?
A. The shorelines are strengthened.
B. Solid rock breaks apart.
C. The rocks form a barrier, and the shorelines are not affected.
D. Small rocks and sand block the waves' energy.
Answer:
B. Solid rock breaks apart.
Explanation:
Answer:
B
Explanation:
I did it on a test lol
Joe wishes to hang a sign weighing 7.50 × 102 N so that cable A attached to the store makes a
30.0° angle, as shown in Figure 7-16. Cable B is horizontal and attached to an adjoining building. What is the tension in cable B?
The tension in the cable B is 231 N
What do you mean by tension?
Tension can be defined as a force along the length of a medium, especially a force carried by a flexible medium, such as a rope or cable. It can be defined as an action-reaction pair of forces acting at each end of the said elements.
From the above figure ,
Ta sin30 = w / sin30
Ta = 750N / sin 30
Ta = 1500 N
In the same way
Tb - Tacos30
(1500N)cos30
231N
Hence, The tension in the cable B is 231 N
To know more about Tension from the given link
https://brainly.com/question/24994188
#SPJ1
True/false: a polarized material must have a nonzero net electric charge.
The answer is False. A polarized material does not need to have a nonzero net electric charge. Polarization occurs when the positive and negative charges within a material are displaced relative to each other, creating an electric dipole moment.
This can happen in materials such as dielectrics or insulators, which do not conduct electricity. The net electric charge of a polarized material can still be zero, as the overall positive and negative charges remain balanced, but the charges are spatially separated. Polarization plays an important role in phenomena such as capacitance, dielectric constant, and polarization-induced electric fields.
To know more about polarized visit :-
https://brainly.com/question/29217577
#SPJ11
other quanto
Dalex when
the face
into that one dan
a Explains why fish can
Survive under
Horan
I'm not sure what you were trying to put here
What are some ways I can have a good wardrobe without breaking the bank?
Zinc sulfide can be made by heating a mixture of zinc and sulfur. The properties of each substance in this process are shown in the table.
Substance Physical
Melting Solubility
State
Point (in water, Color
(°C) pH = 7)
zinc
solid 419.5 insoluble Silver
sulfur
solid
115.2 insoluble yellow
zinc sulfide
solid
1,830.0 insoluble white
Source: American Elements,
<
Based on the information in the table, select the correct answer from each drop-down menu to complete the paragraph.
When a mixture of zinc and sulfur is heated, a chemical reaction
V
This is supported by the data in the table showing that
During
process, the zinc and sulfur atoms
Answer:
thats alot
Explanation:
Zinc sulfide is a solid that is white to yellow in color and is frequently used as a pigment.
What is zinc sulfhide?Zinc sulfide can be transparent in its thick synthetic form, serving as a window for both visual and infrared optics. The density of ZnS is 4.090 g/cm3. It dissolves more readily in acids than in water. ZnS boils at 1,185 °C.
When zinc oxide and hydrogen sulfide react, zinc sulfide and water are formed as a byproduct. Another way to make the compound is by heating a sodium thiosulfate and zinc sulfate solution.
Making an equimolar mixture of zinc and sulfur powders and lighting it up is a third method. Impure ZnS and a vivid green flame are the results. By decanting, impure ZnS can be made pure.
Therefore, Zinc sulfide is a solid that is white to yellow in color and is frequently used as a pigment.
To learn more about zinc sulfide, refer to the link:
https://brainly.com/question/28607192
#SPJ2
Electrolytes are compounds that conduct electricity in aqueous solutions. For a compound to be considered an electrolyte, what must happen when it dissolves in water?
When a compound dissolves in water to become an electrolyte, it must dissociate or break apart into ions.
These ions are then able to carry an electrical charge and conduct electricity in the aqueous solution. The greater the degree of dissociation, the stronger the electrolyte will be.
For example, when sodium chloride (NaCl) dissolves in water, it dissociates into sodium ions (Na+) and chloride ions (Cl-). These ions are then able to conduct electricity in the solution.
In contrast, a compound that does not dissociate into ions when dissolved in water is considered a nonelectrolyte and will not conduct electricity.
In summary, for a compound to be considered an electrolyte, it must dissociate into ions when dissolved in water, allowing it to conduct electricity in the aqueous solution.
To know more about electrolytes refer here:
https://brainly.com/question/29771118#
#SPJ11
Question 1 of 10
2 Points
A piece of ice absorbs heat and melts. Which statement best describes the
changes in the ice as it melts?
A. The kinetic energy of the particles increases as the temperature
increases.
B. The potential energy of the particles increases as intermolecular
forces are overcome.
C. The potential energy of the particles increases as the temperature
increases.
D. The kinetic energy of the particles increases as intermolecular
forces are overcome.
option A is correct✔✔☑
Objects 1 and 2 attract each other with an electrostatic force of 8 units. If the charge of Object 1 is multiplied by 1 AND the charge of object 2 is multiplied by 3 AND the distance separating Objects 1 and 2 is divided by 4, then the new electrostatic force will be _____ units.
The new electrostatic force will be 384 units.
The electrostatic force of attraction between two charges \(q_{1} \\\)(charge of object 1) and \(q_{2}\)(charge of object 2) separated by a distance d is given by
\(F = \frac{q_{1} q_{2}}{4\pi E_{0} d^{2} } \\\)
\(E_{0} = 8.854 * 10^{-12} C^{2} N^{-1} m^{-1}\) is the permittivity of free space.
Initially, we have,
\(\frac{q_{1} q_{2}}{4\pi E_{0} d^{2} } =F_{1} = 8 units\)
Now, if the charge of object 1 is multiplied by 1, the charge of object 2 is multiplied by 3, and the distance separating objects 1 and 2 is divided by 4, we have, \(q_{1} =q_{1}, q_{2} =3q_{2} , d=\frac{d}{4}\).
The new electrostatic force will be,
\(F_{2} = \frac{q_{1} 3q_{2}}{4\pi E_{0} (\frac{d}{4} )^{2} } \\\\\) units.
We have, \(F_{1} = 8 units= \frac{q_{1} q_{2}}{4\pi E_{0} d^{2} } \\\)
Hence,
\(F_{2} =\frac{8*3}{(\frac{1}{4}) ^{2} } units= 384 units.\)
Hence, the new electrostatic force will be 384 units.
To read a similar problem on electrostatic forces visithttps://brainly.com/question/16049250
A 12 kg sled slides down a hill and collides inelastically with an 8 kg block at rest at the bottom of the hill (the sled and block stick together). There is no friction on the hill but the coefficient of friction on the flat ground is µ = .75. The sled and block slide for 2.5 meters along the flat ground before stopping. Calculate the following:
What is the velocity of the sled at the bottom of the hill (just before impact)?
The frictional force between the sled and block (stuck together) and the flat ground is 147 N.
The normal force is the force exerted on an object perpendicular to the surface it is in contact with, and it can be calculated by using the weight of the object (mg). In this case, the weight of the sled and block (stuck together) is 12 kg + 8 kg = 20 kg. So, the normal force is 20 kg * 9.8 m/s^2 = 196 N.
Using the coefficient of friction provided (µ = .75), we can calculate the frictional force as:
friction = .75 * 196 N = 147 N.
So, the frictional force between the sled and block (stuck together) and the flat ground is 147 N.
What is frictional force?
Friction is the force that resists the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral movement of two solid surfaces in contact.To know more about frictional force, click the link given below:
https://brainly.com/question/1714663
#SPJ1
2.a transverse wave is traveling down a rope with mass, m = 10 kg, and length, l = 50 m. if the rope is under a tension force of 2000 n, what is the wave speed of the transverse wave?
The wave speed of a transverse wave traveling down a rope can be determined using the formula v = √(T/μ), where v represents the wave speed, T is the tension force, and μ is the linear mass density of the rope.
To find the linear mass density, we divide the mass of the rope (m) by its length (l): μ = m/l.
Given that the mass of the rope is 10 kg and the length is 50 m, the linear mass density is μ = 10 kg / 50 m = 0.2 kg/m.
Substituting the values of T = 2000 N and μ = 0.2 kg/m into the formula for wave speed, we have:
v = √(2000 N / 0.2 kg/m)
= √(10000 m^2/s^2 / kg/m)
= √(10000 m^2/s^2) (canceling out the units)
= 100 m/s
Therefore, the wave speed of the transverse wave traveling down the rope is 100 m/s.
To know more about Linear density, visit;
brainly.com/question/17594847
#SPJ11
Suppose the velocity of an object moving along a line is positive. are position, displacement, and distance traveled equal? explain. my math lab
No, the object's displacement and distance traveled will be equal; however, because the object's initial position is unknown, the object's position may differ from its displacement and distance traveled.
Because the initial position is not provided, we cannot assert that the displacement or distance equals the position. We might have arrived at a different conclusion if the starting point had been zero, because the distance from zero equals the position.
What precisely do you mean by position, displacement, and distance?
The location of an object (whether a person, a ball, or a particle) at a given point in time is referred to as its position. The displacement of an object is the difference in its position from one time to the next. Distance is the total amount the object has traveled in a certain period of time.
Find more on velocity at : brainly.com/question/11347225
#SPJ4
for a fixed amount of gas at a fixed temperature, what will happen if the volume is doubled? the pressure exerted by the gas will double. the pressure exerted by the gas will remain unchanged. the pressure exerted by the gas will halve. the pressure exerted by the gas will quadruple.
According to Boyle's law, which states that the pressure of a gas is inversely proportional to its volume at a constant temperature, if the volume of a fixed amount of gas is doubled, the pressure exerted by the gas will halve. option(1)
This means that the gas molecules will have more space to move around and will collide less frequently with the walls of the container, resulting in a decrease in pressure.
This relationship between pressure and volume is important in understanding the behavior of gases and is used in many applications, including the compression and expansion of gases in engines and refrigeration systems.
Learn more about Boyle's law,
https://brainly.com/question/30367133
#SPJ4
Full Question : For a fixed amount of gas at a fixed temperature, what will happen if the volume is doubled?
the pressure exerted by the gas will double. the pressure exerted by the gas will remain unchanged.the pressure exerted by the gas will halve. the pressure exerted by the gas will quadrupleWhich of the following is NOT an example of good static flexibility?
A.
doing and holding a split
B.
running a mile in six minutes
C.
holding a ballet position for six minutes
D.
crossing your ankles behind your head
Answer:
running a mile in six minutes
Explanation:
Answer:
Not example is B: Running a mile in six minutes
The speed of sound in seawater is 1530 m/s. How long will it take for an
ultrasound signal to be transmitted and received after reflecting back from a
shoal of fish swimming at a depth of 200 m?
The Total time taken for the signal to be transmitted and received after reflecting is 0.261 seconds.
Speed of sound in seawater = 1530m/s.
Total distance travelled by the sound = 200m [ toward fish ] + 200m [ away from fish ]
Total distance = 400m
As, Speed = \(\frac{ Total Distance}{Total Time}\)
Total Time = \(\frac{Total Distance}{Speed}\)
Total Time = \(\frac{400}{1530}\)
∴ Total time = 0.261 second
Let's check similar question of speed of sound in water : https://brainly.com/question/17486664
Does this graph represent a function? Why or why not?
-10
с
10
OA. Yes, because it passes the vertical line test.
B. Yes, because it passes the horizontal line test.
C. No, because it fails the horizontal line test.
n No hecause it faile the vertical line toet
No because it fails the vertical line test
Must a function pass the vertical line test?The vertical line test is a test used to determine whether a relation is a function. It states that a relation is a function if and only if any vertical line intersects the graph of the relation at most once.
If a relation fails the vertical line test, it means that there are two or more points on the graph with the same x-coordinate, and therefore, the relation is not a function.
Therefore, for a relation to be a function, it must pass the vertical line test.
Learn more about vertical line test:https://brainly.com/question/29263148
#SPJ1
particles in a gas ____ and move___at high speeds
Answer:
gas vibrates and moves freely at high speeds.
Explanation:
Hope this helps
What is the resistance of a light bulb if a potential difference of 120 V will produce a current of 0.5 A in the bulb?
0.0042 0
0 0.5 0
O 60 n
O 240 h
Explanation:
Remember
V = IR which is V/I = R 120 v / .5 A = 240 Ω
An element has a charge of -3, has 8 protons, 11 neutrons, and electrons
Word Bank:
12 5 11 8 13
pls help
An object at rest has no net force acting on it.
True or False
Answer:
True
Explanation:
The object is at rest, which means it's not moving, so there is no net force on it, according to Newton's First Law.
Radiation in the infrared (IR) range is________
in energy than visible or ultraviolet light. When a molecule absorbs IR radiation,_________ within the molecule and each____________ creates a band in the molecule's IR spectrum
Compared to visible or ultraviolet light, infrared (IR) radiation has [lower] energy.A molecule's internal bonds vibrate when it absorbs IR radiation, and each [ wavelength] produces a band in the molecule's IR spectrum.
Between visible light and X-rays on the electromagnetic spectrum is ultraviolet light.The wavelength range of UV "light" is between 10 and 400 nanometers. The wavelength of VL is about Four hundred nanometers. Hospitals use UV rays because of their potency to sterilize medical equipment. All living cells are destroyed by the high UV radiation doses. Elephants cover themselves in mud to shield themselves from the sun. Under UV light, scorpions glow. UV radiation is a type of non-ionizing radiation that is emitted by artificial sources like tanning beds and the sun. While it can produce vitamin D, which is good for people, there are also potential health risks. The sun is a natural source of UV radiation for us.
Learn more about ultraviolet light here:
https://brainly.com/question/13695751
#SPJ4
action potentials do not stay in one place, they are _____ throughout the entire sarcolemma like ripples in a pond.a. repolarization
b. endemic
c. point-source
d. propagated
d. propagated. Action potentials spread over the whole sarcolemma like pond ripples, never remaining in one spot. This indicates that an action potential spreads or propagates down.
the length of the membrane after being originated at a single location in the membrane. The electrical charge of the membrane fluctuates in response to the flow of ions, causing a sequence of depolarizations and repolarizations that serve as the basis for this propagation. The transmission of nerve impulses and the contraction of muscles depend on the propagation of action potentials, This indicates that an action potential spreads or propagates down. which also enables quick and efficient communication inside the body.
learn more about propagated here
https://brainly.com/question/20725306
#SPJ4