A heat engine is a device that uses the transfer of heat energy to perform useful work, and it can be found in car engines and steam turbines.
Explanation:A heat engine is a device that uses the transfer of heat energy to perform useful work. It extracts heat from a source and converts it into mechanical work that can be used for various applications. For example, a steam engine in an old-style train converts the heat energy from burning coal into the work needed to drive the train forward.
One of the important principles that govern the operation of heat engines is the second law of thermodynamics. This law sets a limit on the maximum percentage of the extracted heat energy that can be efficiently converted into work.
In summary, a heat engine is a device that utilizes heat transfer to produce useful work, such as car engines and steam turbines.
Final answer:
A heat engine is a device that converts heat into mechanical work, adhering to the principles of thermodynamics with limitations imposed by its thermal efficiency and the second law of thermodynamics.
Explanation:
A heat engine is a device designed to convert heat energy into mechanical work. This conversion is one of the fundamental processes in thermodynamics and is utilized in various applications. For instance, car engines, which are types of heat engines, use the heat generated from burning fuel to propel a vehicle. In another example, steam turbines that generate electricity use steam produced by heat to rotate blades and generate electricity. Such engines operate on cycles, where they repeatedly return to their original state by the end of each cycle. The thermal efficiency of a heat engine is determined by comparing the work output to the heat energy input; higher efficiency means more work is done with less wasted energy.
The operation of heat engines is governed by the laws of thermodynamics. The first law, also known as the conservation of energy, is applied to heat engines to ensure that energy is conserved throughout the process of converting heat to work. The second law of thermodynamics defines the limits of efficiency for these conversions by stating that not all absorbed heat can be transformed into mechanical work, as some energy is always lost, often as waste heat.
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how much heat is absorbed by a 72g iron skillet when its temperature rises from 11°c to 23°c?
What is the primary force that helps suspension bridges use cables to hold their spans up? A. tension force B. resistance force C. normal force D. elastic force E. applied force
Answer:
A. Tension force
Explanation:
These are bridges that use cables to hold the road way up.
The cables in a suspension bridge receive the tension force of the bridge. These cables transmit these forces to the towers supporting the bridge and are compressed into the ground.
Answer:
The correct answer is option A. "tension force".
Explanation:
Suspension bridges, like the Golden Gate Bridge or the Brooklyn Bridge, use tension force as the primary source of force that cables use to hold their spans up. The supporting cables receive the tension forces of the bridge, and this same force passes to the anchorages and into the ground. This equilibrium that the tension force gives among the different elements of the bridge, gives the support to hold the bridge together.
A 110-pound person pulls herself up 4.0 feet. This took her 2.5 seconds. How much power was developed?
0.13 hp
0.32 hp
2.0 hp
3.1 hp
Answer:
0.32 Hp is the answer. right
Answer: Power developed by her is 0.32 hp
Explanation:
Work done , W= Force(F) X Displacement (d) in the direction of force
Thus work done , [tex]W=Fd=110\times 4.0 ft-lbf = 440 ft-lbf[/tex]
Now 1.0 ft-lbf = 1.355 joules of energy
Therefore , work done, W= 440x 1.355 J = 596.2 J
Average Power , [tex]P=\frac{work done(W)}{time (t)}[/tex]
=> [tex]P=\frac{596.2}{2.5} watts = 238.5 watts[/tex]
We know 746 hp = 1.0 watts
=> [tex]P=\frac{238.5}{746} hp=0.32 hp[/tex]
Thus average power developed by her is 0.32 hp
Cereal plants gain chemical potential energy as they grow. Which form of energy is converted to create the chemical potential energy?
The plant absorbs the sunlight which serves as source of energy for the plant. Therefore, the form of energy which gets converted to “chemical potential energy is the solar energy”.
Explanation:
In process of photosynthesis, the plant makes the food and release oxygen, this occurs only in presence of solar energy that is sunlight. Therefore, the source of energy for the plants are sunlight which provides solar energy which is used up in energy conversion through various process.
The end product of the energy resource is the conversion to chemical potential energy gained over the growth of the cereal plants.
The coefficient of static friction between car's tires and a level road is 0.80 If car to be stopped in time of 3.0 sec its speed is
Answer:
23.5 m/s
Explanation:
The velocity of the car in decelerated motion is given by
v = u + at
where
v = 0 is the final velocity
u is the initial velocity
a is the acceleration of the car
t = 3.0 s is the time it takes for the car to stop
The acceleration of the car is given by the frictional force, which is the only force acting on the car along the direction of motion, so:
[tex]ma = -\mu mg\\a = -\mu g = -(0.80)(9.8 m/s^2)=-7.84 m/s^2[/tex]
where
[tex]\mu=0.80[/tex] is the coefficient of friction
Solving the previous equation for u, we find the initial velocity:
[tex]u=v-at=0-(-7.84 m/s^2)(3.0 s)=23.5 m/s[/tex]
the turning effect of force is called
The answer is torque.
The turning effect of force is torque.
Answer:
The turning effect of force is called Torque
answer please 98 points also brainliest
the answer is D) The air in the aquarium is saturated
none of the other answers were realistic AND I took this before so I know the right answer.
Answer:
d.
Explanation:
Look at it this way, when a sponge is saturated it cannot take in any more water. When air (a mixture of gasses) is saturated it cannot take in any more water vapour and water vapour will condense out as liquid water. This is termed the saturation point.
Air is classed usually as a percentage of saturation, dry air being 0% and saturated 100%
However, unlike the sponge ananalogy, 1kg of air will have a different capacity for water vapour depending on its temperature (and pressure). Charts (Psycrometric Charts) are available that allow the degree of saturation to be calculated, usually by determining the dew point (temperature at which 100% saturation occurs) by using a wet bulb thermometer and comparing it with the normal dry bulb temperature.
The voltage in a lightbulb is given by the equation V= IR. In this equation, Vis
the voltage, lis the current, and Ris the resistance. What is the current in a
lightbulb with a voltage of 35.0 V and a resistance of 175 n?
O A. 6125 A
O B. 1.40 A
O C. 0.200 A
O D. 5.00 a
V=IR
35=I(175)
*Divide both sides by 175*
0.2=I
C. 0.200 A
Hope this helps!!
The current in a lightbulb with a voltage of 35.0 V and a resistance of 175 ohm is 0.2 A.
Find the current in a lightbulb?Given:
The voltage in a lightbulb is given by the equation V=IR V is the voltage, I is current, and R is the resistance.The voltage of the lightbulb is given as 35.0 V.The resistance of the lightbulb is given as 175 Ohm.As the equation is given,
V= IR
where I is current, R is resistance and V is the voltage.
Now, I = V/R
As the value of Voltage and resistance of the lightbulb is given, we will put in the above equation, we get;
I = 35.0/ 175 A
I = 0.2 A.
Hence, the current of the lightbulb is 0.2 A.
Therefore, Option C is the correct answer.
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what is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ?
a. 10%
b. 20%
c. 80%
d. 25%
Answer:
b. 20%
Explanation:
Efficiency of an engine is a ratio in percentage of the work done to the energy intake of the engine.
η=(Q₁-Q₂)/Q₁×100%
η is efficiency, Q₁ is the energy intake, Q₂ is energy wasted.
The information provided is:
Energy intake = 400 J
Work done = 80 J = (400-320) =Q₁-Q₂
Energy wasted =320 J
η= 80/400×100%
=20%
Answer:
B.20 %
Explanation:
2 Points
Which of the following could be vector magnitudes?
A. 30 m/s
B. 15 hours
O
C. 25 milliliters
D. 15 kilometers
SUBMIT
Answer:
A. 30 m/s
D. 15 kilometers
Explanation:
Vector quantities have both magnitude and direction. Among the provided choices, B and C are scalar quantities as they have no direction.
30 m/s is the magnitude for velocity, a derivative of displacement.
15 kilometers is the metric magnitude (10³m) for displacement.
What happens when Chlorine reacts with Bromine?
A. Electrons move from the Chlorine atoms to the Bromine atoms.
B. Electrons move from the Bromine atoms to the Chlorine atoms.
C. Electrons are shared between the Chlorine atoms and the Bromine atoms.
D. Electrons become delocalized among the atoms.
Chlorine and bromine would likely share electrons to form a covalent bond, not a common reaction. Answer C is correct, as halogens generally share electrons when bonded together.
Explanation:When chlorine reacts with bromine, the outcome depends on the specific conditions of the reaction, such as the presence of other substances and the reaction environment. However, chlorine and bromine are both halogens, and a reaction between them is not typical because they are both nonmetals with high electronegativity. Chlorine is more electronegative than bromine, but not enough to draw electrons away from bromine to form an ionic bond. Instead, if they were to react directly, they would most likely form a covalent bond where electrons are shared between the atoms. Therefore, the most applicable answer to this particular multiple-choice question would be, "C. Electrons are shared between the Chlorine atoms and the Bromine atoms."
It's important to note that this type of reaction isn't common, and the halogens more typically form compounds with metals, where a metal donates electrons to the halogen, as in the formation of ionic bonds such as sodium chloride (NaCl). An example of such electron transfer is seen when sodium (Na), which has a low ionization potential, reacts with chlorine (Cl), which has a high electron affinity, resulting in the chlorine atom gaining an electron and sodium donating one.
Which of the following describes an electric motor?
Check all that apply.
A.) Changes electric energy to mechanical energy.
B.) Can be powered by a hand crank.
C.) Uses the interaction between a spinning coil of wire and magnet.
D.) Is found in many appliances with moving parts, like a vacuum cleaner or a blender.
An electric motor changes electrical energy into mechanical energy, often found in household appliances like vacuum cleaners or blenders. They use the interaction between a spinning coil of wire and a magnet.
Explanation:An electric motor is a device that transforms electrical energy into mechanical energy. This is accomplished through the interaction between a spinning coil of wire and a magnet, a mechanism called electromagnetic induction. Many common appliances with moving parts, such as vacuum cleaners or blenders, contain electric motors in their design to facilitate desired functionalities, such as rotation or movement.
Option B, which suggests an electric motor can be powered by a hand crank, is incorrect. This describes a manual or mechanical system, not an electric motor.
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Electric motors convert electrical energy into mechanical energy through magnetic interactions.
Electric motors are devices that convert electrical energy into mechanical energy. They operate based on the interaction of magnetic fields and current-carrying conductors, generating force to produce motion. Electric motors are commonly found in various applications like industrial fans, household appliances, power tools, and more.
when a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false
Answer:
False
Explanation:
Gravity and impact puts a toll on it.
Which statement correctly describes the current in a circuit that is made up of any two resistors connected in parallel with a battery?
A. the current in the battery and in each resistor is the same
B. The current the battery equals to the sum of the currents in the resistors
c.The current in the battery is less than the current in either resistor
d. The current in the battery equals to the product of the currents in the resistors
B. The current the battery equals to the sum of the currents in the resistors describes the current in a circuit that is made up of any two resistors connected in parallel with a battery
What is a parallel combination ?
When two or more resistances are connected between the same two points, they are said to be connected in parallel combination
Resistors are connected in parallel combination , and its been known that if resistors are connected in parallel combination than current gets divided in each branch according to the value of resistance attached in that branch and voltage remains same across each resistance .
Also total current in the circuit or current in the battery is equal to the algebraic sum of current in each branch of the circuit
correct answer will be B. The current the battery equals to the sum of the currents in the resistors
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What happens when a rubber balloon is rubbed against wool and gains electrons?
A. A positive charged is induced on the balloon and the wool acquires a negative charge.
B. A negative charged is induced on the balloon and the wool acquires a positive charge.
C. The balloon and the wool both become positively charged.
D. The balloon and the wool both become negatively charged.
Answer:
A negative charged is induced on the balloon and the wool acquires a positive charge.
Explanation:
It gains negative electrons, therefore becoming negatively charged.
As charge cannot be created, nor destroyed, only transferred, this leaves the wool positive.
Option B. A negative charge is induced on the balloon and the wool acquires a positive charge.
They stick to each other.
It gains negative electrons, therefore becoming negatively charged.
A charge cannot be created, nor destroyed, only transferred, this leaves the wool positive.
Now that they have opposite charges, the two items attract.
What are 3 facts about electrons?Electrons are found free in nature (free electrons) and bound within atoms. Electrons are responsible for the negatively-charged component of an atom. In an atom, electrons orbit around the positively-charged atomic nucleus. In solids, electrons are the primary means of conducting current.
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Match the following terms,
1. heat engine
2. heat pump
3. Boiler
4. Thermostat
•a machine that converts the internal energy of a fuel into mechanical energy.
•an appliance that extracts heat energy from one source and deposits it
elsewhere.
•an appliance that controls the maintenance temperature of a heating
system.
•a heating appliance that uses heat energy released from fossil fuels to warm water for use in radiant or
convection heating systems.
Answer:
1. heat engine ~~ •a machine that converts the internal energy of a fuel into mechanical energy.
2. heat pump ~~ •an appliance that extracts heat energy from one source and deposits it
elsewhere.
3. Boiler ~~ •a heating appliance that uses heat energy released from fossil fuels to warm water for use in radiant or
convection heating systems.
4. Thermostat ~~ •an appliance that controls the maintenance temperature of a heating
system
Final answer:
Heat engine is a machine converting internal energy to mechanical energy; a heat pump moves heat from cool to warm areas; a boiler heats water with fossil fuel energy; and a thermostat maintains temperature in heating systems.
Explanation:
To answer your question of matching each term with the correct definition:
Heat engine – This is a machine that converts the internal energy of a fuel into mechanical energy. Example devices include gasoline and diesel engines, jet engines, and steam turbines that generate electricity.Heat pump – This is an appliance that extracts heat energy from one source and deposits it elsewhere. This device typically moves heat from a cooler area to a warmer area, working against the natural direction of heat flow.Boiler – This is a heating appliance that uses heat energy released from fossil fuels to warm water for use in radiant or convection heating systems. It is a crucial part of many heating systems.Thermostat – This is an appliance that controls the maintenance temperature of a heating system. It regulates the heat output by turning the system on and off to maintain a set temperature.When you enter a pool of water, you feel as though you weigh less. What
causes this apparent change of weight?
A. Buoyant force
B. Cohesive force
C. Adhesive force
D. Pressure
Answer:
Buoyant force.
Explanation:
When we are immersed in a pool of water, we experiences a force pushing us in upward direction due to which our weight is decreased and this force is called Buoyant force.
This is also called upthrust.
Answer: Buoyant force
Explanation:
friction removes energy from objects in motion. Which statement best describes how this works?
a) friction transforms KE into thermal energy
b) friction transfers thermal energy to KE
c) friction transforms TE into PE
d) friction transforms PE into KE
e) friction transfers KE into PE
friction transforms KE into thermal energy (a)
That's why, if it goes on long enough, the moving object actually gets warm.
The correct answer is: a) friction transforms KE into thermal energy.Friction opposes motion by converting kinetic energy into thermal energy. This conversion can be observed through the generation of heat.
Friction is a force that opposes the motion of objects. It transforms the kinetic energy (KE) of an object into thermal energy.This can be observed when you rub your hands together, converting mechanical energy into heat.Thus, the correct answer is: a) friction transforms KE into thermal energy.
26. A 40 kg boy jumps from a height of 4m onto a plate-form mounted on springs. As the
spring compress, the plate-form is pushed down a maximum distance of 0.2 cm below its
initial position, and it then rebounds. What is the loss in potential energy by the boy?
a. 800J
b. 1080J
c. 1600J
d. 1680 J
Answer:
c. 1600J
Explanation:
The loss in potential energy of the boy is given by:
[tex]U=mg \Delta h[/tex]
where
m = 40 kg is the mass of the boy
g = 9.8 m/s^2 is the acceleration of gravity
[tex]\Delta h = 4 m + 0.02 m = 4.02 m[/tex] is the total change in the height of the boy (4 metres + 2 cm due to the compression of the spring)
Substituting, we find
[tex]\Delta U = (40 kg)(9.8 m/s^2)(4.02 m) = 1577 J \sim 1600 J[/tex]
A boat has a mass of 20 kg and will carry 110 kg of passengers across a pool. If 50% of the boat is submerged, what is the total volume of the boat?
Answer:
0.26 m³
Explanation:
There are three forces on the boat: weight of the boat, weight of the passengers, and buoyancy.
∑F = ma
B - mg - Mg = 0
Buoyant force is equal to the weight of the fluid displaced.
ρVg - mg - Mg = 0
ρV - m - M = 0
V = (m + M) / ρ
Given m = 20 kg, M = 110 kg, and ρ = 1000 kg/m³:
V = (20 + 110) / 1000
V = 0.13 m³
Since this is half of the boat's volume, the total volume is 0.26 m³.
The total volume of the boat is 0.0265 cubic meters.
What is Archimedes' principle?Archimedes' principle, which states that the buoyant force on an object immersed in a fluid is equal to the weight of the fluid displaced by the object.
Here in the Question,
Let's begin by finding the weight of the water displaced by the submerged part of the boat. Since we know that 50% of the boat is submerged, we can assume that the volume of water displaced is equal to half of the volume of the boat.
The weight of the water displaced can be found using the density of water, which is 1000 kg/m³. The formula for the weight of water displaced is:
Weight of water displaced = density of water x volume of water displaced x gravitational acceleration
where gravitational acceleration is 9.8 m/s².
Let V be the total volume of the boat. Then, the volume of water displaced is V/2, since 50% of the boat is submerged.
The weight of the boat is 20 kg, and the weight of the passengers is 110 kg. Therefore, the total weight of the boat and passengers is:
Total weight = weight of boat + weight of passengers
Total weight = 20 kg + 110 kg
Total weight = 130 kg
Now we can use Archimedes' principle to find the buoyant force on the boat:
Buoyant force = weight of water displaced = density of water x V/2 x gravitational acceleration
The buoyant force must be equal to the weight of the boat and passengers for the boat to float, so we have:
Buoyant force = Total weight
Substituting the values we have found, we get:
density of water x V/2 x gravitational acceleration = 130 kg x gravitational acceleration
Simplifying and solving for V, we get:
V = 130 kg / (density of water x 9.8 m/s² x 0.5)
Substituting the value of the density of water, we get:
V = 130 kg / (1000 kg/m³ x 9.8 m/s² x 0.5)
V = 0.0265 m³
Therefore, the total volume of the boat is approximately 0.0265 cubic meters.
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Glands that are responsible for lubricating the skin and minimizing water loss are called
Answer:
your answer would be Sebaceous glands
Explanation:
these glands secrete oil/wax called sebum to lubricate and waterproof your skin. Hope this helps :)
"The correct term for the glands responsible for lubricating the skin and minimizing water loss is sebaceous glands.
The skin has several types of glands, each with a specific function. Sebaceous glands are the glands that produce sebum, an oily substance that lubricates the skin and hair. Sebum helps to form a protective layer on the skin's surface, which serves multiple purposes:
1. It prevents the skin from drying out by reducing water loss through the epidermis, which is the outermost layer of the skin.
2. It provides a barrier against foreign pathogens and substances, helping to protect the skin from infections.
3. It contributes to the skin's flexibility and suppleness.
These glands are located all over the body, except for the palms of the hands and the soles of the feet, and are usually associated with hair follicles. The secretion of sebum is an essential process for maintaining healthy skin and hair.
In summary, sebaceous glands play a crucial role in skin health by secreting sebum, which lubricates and waterproofs the skin, thereby minimizing water loss and protecting against external threats."
Francois places a ring made of an unknown metal into a graduated cylinder.
The water level in the graduated cylinder rises from 10.0 cm to 11.5 cm. He
has already found that the mass of the ring is 16.5 g. What is the density of
the ring?
O A. 1.7 g/cm
O B. 0.09 g/cm3
O C. 11.0 g/cm
O D. 1.4 g/cm3
The density of the ring is calculated by dividing its mass (16.5 g) by its volume (1.5 cm^3). The resulting density is 11.0 g/cm^3.
Explanation:The density of an object can be calculated by dividing its mass by its volume, according to the formula Density = Mass/Volume. In this case, Francois found the mass of the ring is 16.5 g. The volume can be determined by the displacement of water in the graduated cylinder, which is 11.5 cm - 10.0 cm = 1.5 cm3. Now we can calculate the density using the given values: Density = 16.5 g / 1.5 cm3 = 11.0 g/cm3. So, the option C, 11.0 g/cm is the correct answer.
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Ella uses a camera as a model of the eye. The film in the camera serves the same role as which part of the eye?
lens
pupil
sclera
retina
Answer is :
retina- last choice
The film in a camera serves the same role as the d) retina in the eye.
Both the film and the retina are responsible for capturing images. In a camera, light enters through the lens, passes through the aperture (similar to the pupil), and is focused onto the film, where the image is recorded. Similarly, in the human eye, light passes through the cornea and lens, is focused by the lens, and hits the retina at the back of the eye.
The retina contains photoreceptor cells that convert the light into electrical signals, which are then sent to the brain for processing, forming the image we see. Therefore, the film in the camera acts as the light-sensitive part that captures and stores the image, just like the retina functions as the light-sensitive layer that detects and processes visual information in the eye.
Read about Pendulums. Then complete the sentences based on the diagram of the pendulum. Be sure to keep this
article open because there will be several questions related to it.
The pendulum has the most potential energy
The pendulum has the least kinetic energy
The pendulum has the most kinetic energy at the top of swing
The pendulum has the least potential energy
Answer:
1. at the top of swing 2. at the top of swing 3. at the bottom of swing 4.at the bottom of swing
Explanation:
Answer:
The pendulum has the most potential energy at the top of swing.
The pendulum has the least kinetic energy at the top of swing.
The pendulum has the most kinetic energy at the bottom of swing.
The pendulum has the least potential energy at the bottom of swing.
A good hypothesis must be which of the following
Answer:
Testable
Explanation:
A good hypothesis must always be testable.
Answer:
Must be testable and falsifiable
What is the momentum of a 5 kg object that has a velocity of 1.2 m/s? 3.8 kg • m/s 4.2 kg • m/s 6.0 kg • m/s 6.2 kg • m/s
Answer:
Your answer will be 6.0kg•m/s
Explanation:
In the given question all the required details d given. Using these information's a person can easily find the momentum of the object. In the question it is already given that the mass of the object is 5 kg and the velocity at which it is traveling is 1.2 m/s.We know the equation of finding momentum asMomentum = mass * velocity = 5 * 1.2 = 6So the momentum of the object is 6 Newton.
Answer:
Momentum of an object, p = 6 kg-m/s
Explanation:
It is given that,
Mass of an object, m = 5 kg
Velocity of that object, v = 1.2 m/s
We need to find the momentum of an object. It is equal to the product of mass and its velocity. Mathematically, it is given by :
p = m v
[tex]p=5\ kg\times 1.2\ m/s[/tex]
p = 6 kg-m/s
So, the momentum of an object is 6 kg-m/s. Hence, this is the required solution.
Kinetic energy is the energy an object has as a result of its
Answer:
as a result of its motion
Explanation:
Explanation:
The kinetic energy of an object is given by due to its motion. Mathematically, it is given by :
[tex]E_k=\dfrac{1}{2}\times m\times v^2[/tex]
Where
m = mass of an object
v = velocity
The kinetic energy of an object depends on its mass and the velocity with which it is moving. So, basically kinetic energy of an object depends on its motion.
Acid rain is a secondary pollutant.
T or F
Answer: True
Explanation:
edgen 2022
In which source of water would a wave travel the fastest? A) ice B)cold C) room temperature D) hot
Answer:hot
Explanation:
Ice don’t move at all. cold makes it move slowly. Room temperature it’s ok it might be kinda fast but hot water moves fastest.
Answer: Option (D) is the correct answer.
Explanation:
In a hot source, molecules will have more kinetic energy. As a result, they tend to move randomly and at a rapid rate from their initial position.
So, when a wave travels through hot source then vibrations caused by it will also move at a faster rate due to high kinetic energy in the molecules of the source.
Whereas in ice or cold source molecules have very less kinetic energy. As a result, these molecules will be held much more closer to each other.
So, when a wave travels through it then it will find difficulty to pass through the molecules as they are held closer to each other due to which there is very less or no vacant space for the wave to pass on from one end to another.
At room temperature, a wave will travel less fast as compared to wave in a hot source.
Thus, we can conclude that in hot source of water would a wave travel the fastest.
Estimate of the number of stars in our galaxy
Answer:
About 250 billion stars are in the Milky-way Galaxy