The temperature of a system must increase when heat energy is added.
Please select the best answer from the choices provided
T
F
Refrigerant 134a enters an insulated diffuser as a saturated vapor at 80°f with a velocity of 1453.4 ft/s. at the exit, the temperature is 280°f and the velocity is negligible. the diffuser operates at steady state and potential energy effects can be neglected. determine the exit pressure in lbf/in2 .
The exit pressure from the diffuser can be found by applying the energy balance, which involves the conversion of the aerodynamic velocity of the refrigerant on entry into an internal energy form. The specific enthalpies at the inlet and outlet aid in the calculation.
Explanation:In this question, we're dealing with a thermodynamics problem involving the diffuser of an HVAC system that uses Refrigerant 134a. In the beginning, the refrigerant enters as a saturated vapor with a certain temperature(80ºf) and velocity(1453.4 ft/s) and exits at different temperatures (280ºf) and negligible velocity. With the assumption of the system operating at a steady state and neglecting potential energy effects, we need to find the exit pressure of the diffuser.
This problem involves the application of the first law for the steady-flow process and Bernoulli's equation. The first law of thermodynamics for a steady-flow process can be written as:
ΔKE + ΔPE + Q = ΔH + W
Since it's given that potential energy effects can be neglected, we have only kinetic energy and enthalpy to consider. Bernoulli's equation can be used to express the principle of energy conservation in terms of fluid flow. At the inlet, the kinetic energy is quite significant, but negligible in the outlet, all of that kinetic energy is converted into internal energy (thermal form). So we can set up the energy balance based on these assumptions:
0.5 * (inlet velocity)^2 = (hout - hin)
where hout and hin are the specific enthalpies at the outlet and inlet respectively. We can find the values for these quantities in the thermodynamic table for Refrigerant 134a based on the given temperatures.
Once we solve this equation for hout, we can use another lookup in the table to find the pressure corresponding to the outlet temperature (280ºf) and the found enthalpy.
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After nuclear explosions animals and humans can continue to die due to ingestion of radioactive particles and nuclear ______________.
The term 'nuclear fallout' describes the radioactive particles released after a nuclear explosion that pose health risks to humans and animals. These particles can cause severe cellular damage by ionizing molecules in living organisms, leading to serious health conditions including various cancers.
Radiation Damage to Biological Systems
After a nuclear explosion, radioactive particles can be released into the environment, known as nuclear fallout. These particles pose a significant health risk to animals and humans upon ingestion or inhalation, as the radiation can cause cellular damage leading to illness or death. The term the student is looking for to complete the sentence is likely 'nuclear fallout'.
Radioactive nuclides emit high-energy particles and electromagnetic waves that, when encountered by living cells, can cause heating, break chemical bonds, or ionize molecules. The most severe biological damage occurs when these emissions ionize molecules, creating highly reactive ions and molecular fragments. This reaction can cause considerable harm to biomolecules within living organisms, leading to malfunctions in normal cell processes and overwhelming the body's repair mechanisms.
An example of such damage is the contamination of the food chain, where radioactive materials like iodine-131 and strontium-90 can become incorporated into human and animal tissues, potentially causing cancers in regions such as the thyroid and bone. Events like the Chernobyl disaster in 1986 illustrate the devastating effects of radioactive contamination, with increased cancer rates observed within the affected populations.
The nearest star to our sun is proxima centauri, at a distance of 4.3 light-years from the sun. a light-year is the distance that light travels in one year (365 days). part a how far away, in km, is proxima centauri from the sun?
Final answer:
The distance from the Sun to Proxima Centauri is approximately 40 trillion kilometers.
Explanation:
The distance from the Sun to Proxima Centauri is approximately 40 trillion kilometers.
To compute the separation from Proxima Centauri to the Sun in kilometers, we want to change the separation from light-years over completely to kilometers.
In the first place, we should switch 4.3 light-years over completely to kilometers.
The speed of light is around 299,792 kilometers each second.
To change light-years over completely to kilometers, we can utilize the accompanying recipe:
Distance in kilometers = Distance in light-years × Speed of light × Number of seconds in a year
Number of seconds in a year = 365 days × 24 hours × an hour × 60 seconds
Presently, we should connect the qualities:
Distance in kilometers = 4.3 light-years × 299,792 kilometers each second × (365 days × 24 hours × an hour × 60 seconds)
Computing the worth gives us:
Distance in kilometers ≈ 40,080,595,680 kilometers
Subsequently, Proxima Centauri is roughly 40,080,595,680 kilometers from the Sun.
As the caterpillar climbs, its potential energy is increasing. what source of energy has been used to effect this change in potential energy?
The source of energy used to increase the caterpillar's potential energy as it climbs is gravitational potential energy.
Explanation:As the caterpillar climbs, its potential energy is increasing. The source of energy used to effect this change in potential energy is gravitational potential energy. Gravitational potential energy is the stored energy an object has due to its height and the force of gravity. As the caterpillar climbs higher, it gains more gravitational potential energy.
Which statement(s) correctly compare the masses of protons, neutrons, and electrons? Check all that apply.
Protons and neutrons have similar mass.
Protons and electrons have similar mass.
Neutrons and electrons have similar mass.
Protons are smaller than a neutron or an electron.
Neutrons are smaller than a proton or an electron.
Electrons are smaller than a proton or a neutron.
Answer:
these 2 are correct-
Protons and neutrons have similar mass.
Electrons are smaller than a proton or a neutron.
Explanation:
hope this helps! got it right on edge :)
The desert and tundra are alike because they both have
A) extreme daily temperature changes.
B) large seasonal variation.
C) limited available water.
D) sandy soils.
Juan inflates a balloon and then releases its end to let the balloon go free as air comes out. The balloon then flies around the room. Which statement describes how this example is an application of Newton’s laws of motion? According to Newton’s first law of motion, the balloon continues moving until the forces on it are balanced. According to Newton’s third law of motion, the balloon is pushed forward as the air is forced out. According to Newton’s third law of motion, the balloon resists any change of motion unless an unbalanced force acts upon it. According to Newton’s second law of motion, the balloon exerts a force on the air, which exerts a force back on the balloon.
The balloon's flight demonstrates Newton's Third Law of Motion, where the air forced out of the balloon propels it in the opposite direction, similar to the thrust produced by rockets.
Explanation:The balloon flying around the room when air is let out is an application of Newton's Third Law of Motion, which states that for every action there is an equal and opposite reaction. When Juan releases the balloon, the air rushing out exerts a force in one direction, and the balloon reacts by moving in the opposite direction.
This is the principle behind how rockets are propelled, where they exert a large force backward on the gas in the combustion chamber, and in turn, the gas exerts an equal and opposite reaction force forward on the rocket, creating what is known as thrust.
This principle is demonstrated in numerous everyday experiences, such as a car accelerating by the ground pushing forward on the tires as they push backward against the ground, or a bird flying by pushing air downward and backward to gain lift and move forward.
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a quantity of gas in a cylinder received 1600j of hear from a hot plate at the same time 800j of work are done on the gas what is the change in the internal energy?
A baseball team is practicing throwing balls vertically upward to test their throwing arms. A player manages to throw a ball that reaches a maximum altitude of 10 m above the launch point, before falling back down. The acceleration due to gravity is 9.80 m/s 2 . (a) With what initial speed was the ball thrown? (b) How long did it take for the ball to reach its maximum altitude?
Which statements accurately describe satellite motion? Check all that apply.
Gravity is the only force acting on a satellite.
Inertia is the only cause of a satellite’s circular motion.
Air resistance prevents satellites from staying in orbit for very long.
Circular orbits result from the interaction between gravity and inertia.
Gravity provides the centripetal force for satellites.
Satellites are in free fall around Earth or other central objects.
Answer:
Gravity is the only force acting on a satellite.
Circular orbits result from the interaction between gravity and inertia.
Gravity provides the centripetal force for satellites.
Satellites are in free fall around Earth or other central objects.
Explanation:
Due to gravity, which acts as a centripetal force, the satellite remains in orbit, otherwise the straight motion generated by inertia would take it out of course. If the satellite moves very fast, it will leave the orbit towards the depths of space. On the other hand, if it moves very slowly, gravity will bring it directly to Earth. When the balance between gravity and inertia is achieved, the satellite is still in free fall, but at a very small rate.
Circular motion is defined as the movement of the object along the circular path or rotation along the circular path. The orbiting satellite follows the circular motion, such that:
Gravity is the only force acting on a satellite. Circular orbits result from the interaction between gravity and inertia.Gravity provides the centripetal force for satellites.Satellites are in free fall around Earth or other central objects.In the circular motion of the satellite, the centripetal force is given by gravity. The gravitational force ensures the circular path, otherwise, the satellite can undergo the linear path due to inertia.
The circular orbit of the satellite is provided between the balance between gravity and inertia. The satellite is moving very slow, which will result in the falling of the satellite towards the earth.
On the other hand, if the force of gravity acted strongly, it will lead to the fall of satellites in deep space. Thus, when the balance is achieved the satellite is in free fall at a very small and negligible rate.
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The speed of an aircraft is sometimes expressed as a mach number: mach 1 means that the speed is equal to the speed of sound. if you wish to determine the speed of an aircraft going mach 2.2, for example, in meters per second or miles per hour, what additional information do you need?
G 1470-kilogram truck moving with a speed of 24.0 m/s runs into the rear end of a 1110-kilogram stationary car. if the collision is completely inelastic, how much kinetic energy is lost in the collision?
A river flowing steadily at a rate of 175 m3 /s is considered for hydroelectric power generation. it is determined that a dam can be built to collect water and release it from an elevation difference of 80 m to generate power. determine how much power can be generated from this river water after the dam is filled.
Final answer:
The power that can be generated from this river after the dam is filled is 137.2 MW.
Explanation:
To determine the power that can be generated from the river water after the dam is filled, we need to calculate the potential energy of the water and consider the efficiency of the conversion process. The potential energy can be calculated using the formula mgh, where m is the mass of water, g is the acceleration due to gravity, and h is the height of the dam. In this case, the flow rate of the river is given as 175 m³/s and the height difference is 80 m.
Using the formula, we can calculate the mass of the water passing through the dam per second:
Mass = flow rate x density = 175 m³/s x 1000 kg/m³ = 175,000 kg/s
Then, we can calculate the potential energy:
Potential Energy = mass x gravity x height = 175,000 kg/s x 9.8 m/s² x 80 m = 137,200,000 J/s = 137.2 MW.
Therefore, the power that can be generated from this river after the dam is filled is 137.2 MW.
A bored kid, 30 meters from a building throws a ball at an angle of 50 degrees with a velocity of 20m/s at the building wall. at what height above the throwing line will the ball hit the wall?
A hypothetical spherical planet consists entirely of iron. what is the period of a satellite that orbits this planet just above its surface?
The orbital period of a satellite orbiting just above the surface of a hypothetical iron planet is approximately 84.5 minutes. This calculation uses Kepler's third law and the known density of iron. The result is derived after integrating the gravitational constant and mass into the formula.
Orbital Period of a Satellite Around an Iron Planet
To determine the period of a satellite orbiting just above the surface of a hypothetical spherical planet made entirely of iron, we can use Kepler's third law in conjunction with some known information about iron and orbital mechanics.
The formula we use here is:
T = 2π √(r³ / GM)
where:
T is the orbital period.r is the radius of the planet.G is the gravitational constant, 6.67430 × 10-11 m³ kg-1 [tex]s^{-2[/tex].M is the mass of the planet.First, we need to calculate the radius of the iron planet. Iron has a density of about 7874 kg/m³. If we assume the planet has a volume V, the mass M can be related to the density ρ and radius r by:
V = 4/3 π r³
M = V × ρ or M = (4/3) π r³ ρ
Next, we substitute this mass into the orbital period formula:
T = 2π √[r³ / G (4/3 π r³ ρ)]
Simplifying, we get:
T = 2π √[3/(4πG ρ)]
Plugging in the values:
ρ = 7874 kg/m³
T = 2π √[3/(4π × 6.67430 × 10-11 m³ kg-1 s-2 × 7874 kg/m³)]
After performing the calculation:
T ≈ 5069.9 seconds ≈ 84.5 minutes
Thus, the orbital period of a satellite just above the surface of an iron planet is approximately 84.5 minutes.
What would be the final temperature of the system if all the heat lost by the copper block were absorbed by the water in the calorimeter?
To find the final temperature of the system, we need to calculate the energy lost by the copper block and the energy gained by the water. Equating these values will allow us to solve for the final temperature.
Explanation:In order to find the final temperature of the system when all the heat lost by the copper block is absorbed by the water in the calorimeter, we need to consider the principles of heat transfer and calorimetry.
First, we need to calculate the energy lost by the copper block using the equation q = m * c * ΔT, where q represents the heat lost, m is the mass of the copper block, c is the specific heat capacity of copper, and ΔT is the change in temperature of the copper block.Next, we assume that all the heat lost by the copper block is absorbed by the water in the calorimeter. We can calculate the energy gained by the water using the same equation as before, but this time using the mass and specific heat capacity of water.Finally, we equate the energy lost by the copper block to the energy gained by the water, and solve for the final temperature of the system.By applying these steps, we can determine the final temperature of the system when all the heat lost by the copper block is absorbed by the water in the calorimeter.
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The final temperature of the system can be calculated using the principle of heat transfer and the concept of specific heat capacity. It assumes that the heat lost by the copper block is entirely absorbed by the water in the calorimeter. By setting up equations for heat change in both copper and water and equating them, we can solve for the final temperature.
Explanation:The final temperature of the system can be calculated using the concept of heat transfer, based on the assumption that the heat lost by the copper block is completely absorbed by the water in the calorimeter. This can be expressed mathematically as:
qmetal = -qwater
We use the formula for calculating heat change which is Q = mcΔT. Here, Q represents heat, m is mass, c indicates the specific heat capacity, and ΔT is the change in temperature (final temperature - initial temperature).
By setting up two situations (one for the copper and one for the water), we can assign known values of specific heat capacity (0.390 J/g°C for copper and approximately 4.18 J/g°C for water) and equate the two equations since the heat lost by the copper block equals the heat gained by the water. This allows us to solve for the final temperature of the system, which is the same for both the copper and the water.
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Mike is conducting an experiment in which he places several different types of soil in a funnel and then pours one liter of water through each. He is careful to pack equal volumes of the soil samples tightly in the funnel and to make sure that only water makes it out of the bottom. He then records the amount of time it takes for half of the water to pass through the soil and out the bottom of the funnel. He records his data in the table below.
Soil Sample Time (seconds)
Soil W 181
Soil X 27
Soil Y 119
Soil Z 50
Which soil sample is the least permeable?
A.
Soil W
B.
Soil Z
C.
Soil Y
D.
Soil X
Permeability is a measure of how fast a liquid can pass through a layer of solid. In this case, the lesser the time, the more permeable the solid is. Or the other way around, the bigger the time, the less permeable the solid is. Therefore the answer in this problem is:
A. Soil W
Answer:
soil W
Explanation:
Permeability is a measure of how easily water flows through soil. A soil that is made up of large, jagged rocks is likely to be more permeable than a soil that is made up of compact clay. One way to test a soil's permeability is to pour water through it. More permeable soil will allow water to pass through it rapidly, while less permeable soil will block more of the water.
"where are the majority of transform faults located?"
HELP MEH a beachgoer leaves a pair of sandals on the shore while she swims, when she puts the sandals on again , the bottom of her feet will feel hot because____.
Answer:
Explained
Explanation:
People visit beaches generally on sunny days. When we leave are sandals on the shore while we swim. The from the sum warm the Sole of the sandals because sandals are generally leather and leather are good absorbers of heat. And once we wear them back after swimming. The heat through conduction is passed on to our feet and our feet feel warm.
A weightlifter is attempting a biceps curl with a 200 n barbell. the moment arm of the barbell about the elbow joint is 40 cm. the moment arm of the elbow flexor muscles is 4 cm. how much force must be produced by these muscles to hold the 200 n barbell in static equilibrium?
Final answer:
The biceps muscles need to produce a force of 2000 N to hold the 200 N barbell in static equilibrium.
Explanation:
To hold the 200 N barbell in static equilibrium, the biceps muscles need to produce a force equal to the weight of the barbell. The moment arm of the barbell about the elbow joint is 40 cm, so the torque exerted by the barbell is calculated as:
Torque = Force x Moment Arm
Torque = 200 N x 40 cm = 8000 N·cm
The moment arm of the elbow flexor muscles is 4 cm. To maintain static equilibrium, the torque exerted by the biceps muscles must be equal and opposite to the torque exerted by the barbell:
Torque biceps = Torque barbell
Force biceps x Moment Arm biceps = Force barbell x Moment Arm barbell
Force biceps x 4 cm = 200 N x 40 cm
Force biceps = (200 N x 40 cm) / 4 cm
Force biceps = 2000 N
Suppose the ring rotates once every 3.80 s . if a rider's mass is 59.0 kg , with how much force does the ring push on her at the top of the ride?
What minimum speed is required for the ball to clear the 0.90-m-high net about 15.0 m from the server if the ball is "launched" from a height of h = 2.70 m ?
A balloon at an amusement park has 1,500 g of gas. By what amount will the mass of the balloon decrease if all the gas inside it escapes?
- 750 g
- 1,500 g
-2,000 g
- 3,000 g
SOMEONE PLEASE HELP ME IT WILL BE SOOOO APPRECAITED!
Answer:
Answer 1,500 g
because if it has 1,500 g and it loses ALL of the gas...
then it will lose 1,500 g
Hope this Helps!
List 2 ways that Dopplar Radar is used in technology
The doppler radar is used in technology in two ways;
· Continuous Doppler radar – it has the capability of receiving signals in means to provide output in velocity from the target
· It may be use as radar gun in which police use to detect speeding.
Final answer:
Doppler Radar is used to measure wind velocities in storms for weather forecasting and to track the speeds of vehicles, crucial for air traffic control and law enforcement.
Explanation:
Doppler Radar is a significant technological tool utilizing the properties of microwave echoes. Two primary ways that Doppler radar is used in technology include:
Tracking and determining wind velocities in storm systems, which is crucial for meteorological research and weather forecasting.
Measuring the speeds of moving objects, such as aircraft and automobiles, which is essential for air traffic control and law enforcement, respectively.
The principle behind Doppler radar is similar to that found in Doppler-shifted ultrasound, and it relies on the change in frequency (or Doppler shift) of the waves reflecting off moving objects to assess their velocity.
The mixture you separated was mixture oof iron filings, sand, and salt. Based on your understanding of matter, is this mixture a homogeneous mixture or heterogeneous mixture? How do you know? A. Heterogeneous mixture-the parts are not uniformly mixed. B. Homogeneous mixture-the parts are uniform mixed C. Heterogenous mixture-the parts are uniformly mixed d. Homogenous mixture-the parts are not uniformly mixed
Answer: Heterogeneous mixture
A mixture forms when different elements are put together and yet they are distinct. it means there is no change in the properties of individual components of a mixture. A mixture can be of two kinds: Homogeneous and Heterogeneous mixture. A homogeneous mixture is the one which has uniformity in its every part. For example: salt mixed in water is a homogeneous mixture. A heterogeneous mixture has visibly distinct components. The mixture was of iron fillings, sand and salt is a homogeneous mixture as the component parts are not uniformly mixed.
The molecules that make up a plastic two-liter bottle A) are in constant, rapid, random motion. B) have a volume of more than two liters if melted. C) expand to take the shape of wherever the bottle is placed. D) are closer together than the molecules of soda that they contain.
The molecules that make up a plastic two-liter bottle are closer together than the molecules of soda that they contain.
What is solid?One of the four common states of matter is solid. Solids have tightly bonded molecules that can only vibrate. This means that solids have a fixed shape that only modifies under the application of force. This contrasts with the random movement of gases and liquids, known as flow.
Melting is the process by which a solid turns into a liquid. When liquids are frozen, they solidify. Dry ice is one of the few materials that can transform directly from a solid to a gas. Sublimation is the term used for this.
Numerous types of forces can exist between the atoms in a solid. For instance, ionic sodium and chlorine are bound together by ionic bonds to form the crystal structure of sodium chloride (common salt).
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Roberto was testing how light interacted with a material he had just developed. The initial speed of light was 3.0 × 108 m/s. The final speed of light after it changed direction was 1.7 × 108 m/s. What type of interaction took place?
The answer to the question would be Refraction.
as we know the two possible answers are refraction and reflection. The questions shows a decrease in speed thus being refraction as a ray in a reflection would not lose its speed. Hope this helps!
Analyzing the question, we can classify the effect of refraction as the speed is reduced when entering the middle.
What is the concept of refraction?Refraction of light is a phenomenon that occurs in electromagnetic waves that are transmitted through some translucent or transparent medium. When light penetrates refractive media, that is, those capable of refracting light, its speed decreases.
the type of interaction that happend is refraction as the speed is reduced when entering the middle.
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When evaluating data, why is it better to make a graph instead of just looking at the raw data in a table?
A lightbulb has a resistance of 285 ω when operating with a potential difference of 110 v across it. what is the current in the lightbulb?