a heat engine that pumps water out of an underground mine accepts 700 kj of heat and produces 250 kj of work. how much heat does it reject, in kj?
Answers
The heat engine that pumps water out of an underground mine accepts 700 kJ of heat and produces 250 kJ of work.
Calculating heat rejected by pump:
The amount of heat it rejects in kJ can be calculated using the First Law of Thermodynamics, which states that the amount of energy that enters a system must be equal to the amount of energy that leaves the system. Therefore, the amount of heat that the engine rejects in kJ can be found by subtracting the amount of work produced from the amount of heat accepted.
Q = H - W where Q is the amount of heat rejected, H is the amount of heat accepted, and W is the amount of work produced. Plugging in the given values, we get Q = 700 kJ - 250 kJQ = 450 kJ. Therefore, the heat engine rejects 450 kJ of heat.
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Related Questions
What acceleration does the force of earth's gravity peoduce
Answers
What do the top of a zip line and the top of a bungee cord have in common
Answers
Answer:
They are both placed at high vantage points for an optimal experience.
Explanation:
Gravity works in your favor when participating in bungee jumping as well as ziplining
Find the center of mass of the region bounded by y=9-x^2 y=5/2x , and the z-axis. Center of Mass = __?
Note: You can earn partial credit on this problem.
Answers
The centre of mass of the region is bounded by y=9-x^2 y=5/2x, and the z-axis is (3.5, 33/8). Formulae used to find the centre of mass are as follows:x bar = (1/M)*∫∫∫x*dV, where M is the total mass of the system y bar = (1/M)*∫∫∫y*dVwhere M is the total mass of the system z bar = (1/M)*∫∫∫z*dV, where M is the total mass of the systemThe region bounded by y=9-x^2 and y=5/2x, and the z-axis is shown in the attached figure.
The two curves intersect at (-3, 15/2) and (3, 15/2). Thus, the total mass of the region is given by M = ∫∫ρ*dA, where ρ = density. We can assume ρ = 1 since no density is given.M = ∫[5/2x, 9-x^2]∫[0, x^2+5/2x]dAy bar = (1/M)*∫∫∫y*dVTherefore,y bar = (1/M)*∫[5/2x, 9-x^2]∫[0, x^2+5/2x]y*dA= (1/M)*∫[5/2x, 9-x^2]∫[0, x^2+5/2x]ydA...[1].
The limits of integration in the above equation are from 5/2x to 9-x^2 for x and from 0 to x^2+5/2x for y.To evaluate the above integral, we need to swap the order of integration. Therefore,y bar = (1/M)*∫[0, 3]∫[5/2, (9-y)^0.5]y*dxdy...[2].
The limits of integration in the above equation are from 0 to 3 for y and from 5/2 to (9-y)^0.5 for x.Substituting the values and evaluating the integral, we get y bar = (1/M)*[(9-5/2)^2/2 - (9-(15/2))^2/2]= (1/M)*(25/2)...[3].
Also, the x coordinate of the center of mass is given by,x bar = (1/M)*∫∫∫x*dVTherefore,x bar = (1/M)*∫[5/2x, 9-x^2]∫[0, x^2+5/2x]x*dA= (1/M)*∫[5/2x, 9-x^2]∫[0, x^2+5/2x]xdA...[4].
The limits of integration in the above equation are from 5/2x to 9-x^2 for x and from 0 to x^2+5/2x for y.To evaluate the above integral, we need to swap the order of integration. Therefore, x bar = (1/M)*∫[0, 3]∫[5/2, (9-y)^0.5]xy*dxdy...[5].
The limits of integration in the above equation are from 0 to 3 for y and from 5/2 to (9-y)^0.5 for x.
Substituting the values and evaluating the integral, we get x bar = (1/M)*[63/8]= (1/M)*(63/8)...[6]Thus, the centre of mass of the region is bounded by y=9-x^2 y=5/2x, and the z-axis is (3.5, 33/8).
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Which pair of impermeable rock traps can form to hold oil and natural gas beneath earth’s surface?.
Answers
The pair of impermeable rock traps that can form to hold oil and natural gas beneath earth's surface are cap rock and salt domes
Oil and natural gas traps are geological formations that hold oil and natural gas underground. To begin with, oil and natural gas form deep underground under high pressure and temperature. They then flow to the surface through porous rocks, which act as pathways. Oil and natural gas reservoirs are formed when there are traps that prevent the fluids from reaching the surface.
The traps can be of two types: structural and stratigraphic. Structural traps are formed when the geology of an area causes rocks to bend and buckle, creating a trap. Stratigraphic traps are formed when changes in the rock layers cause a seal to form, trapping the oil and natural gas.Cap rock and salt domesCap rock and salt domes are two kinds of impermeable rock traps that can form to hold oil and natural gas beneath earth’s surface.
A cap rock is an impermeable layer of rock that lies above an oil or natural gas reservoir, preventing the fluids from escaping to the surface. Salt domes are underground formations of salt that have moved upward through the rock layers due to the weight of overlying sediments. These salt domes can form impermeable traps that prevent the oil and natural gas from escaping.
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what is the process called when we make a copy of our DNA and then turn it into a string of amino acids
Answers
Answer: prolly enzymes
Explanation:I think because since dna is translated into proteins and enzymes are proteins and is made out of strings of amino acids
when you stand at rest with your left foot on one bathroom scale and your right foot on a similar scale, each of the scales will
Answers
the work done against gravity is completely recoverable. this is because gravity is .multiple choice question.quadraticconservativelinear
Answers
The work done against gravity is completely recoverable because gravity is conservative.
In a conservative force, the work done is stored as potential energy and can be recovered as kinetic energy.
Explanation:
A conservative force is a force that does work on an object and the amount of work done by the force is independent of the path taken by the object. This means that if an object is moved from one position to another by a conservative force, the amount of work done by the force is the same, regardless of the path taken by the object between the two positions. The gravitational force is an example of a conservative force.
When an object is lifted against the force of gravity, work is done against gravity. This work is stored as potential energy in the object-Earth system, as the object gains gravitational potential energy. When the object is released and falls back to its original position, the potential energy is converted back to kinetic energy, and then to work, as the object does work on its surroundings.
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Due to the conservatism of gravity, all of the labour done in defiance of it can be recovered.
The work performed is stored as potential energy in a conservative force and is recoverable as kinetic energy.
A conservative force is one that exerts force on an item while doing work that is independent of the path the object takes. In other words, regardless of the path the object takes between two points when being moved by a conservative force, the force does the same amount of work on the object. An illustration of a conservative force is the gravitational force.
Work against gravity is accomplished when an object is raised defying gravity's pull. As the object accumulates gravitational potential energy, this work is stored as potential energy in the object-Earth system. After being released, the object returns to its starting position.
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A car is traveling at a speed of 50 m/sec when it suddenly accelerates at a rate of 5 m/sec2. How fast will the car be going (final velocity) if it maintains that acceleration for 30 seconds?
Answers
Answer:
200 ms-1
Explanation:
v = u+ at
v = 50+ 5×30
v = 200 ms-1
i will give Brainliest
How do pool players use Physics to make the balls on the pool table go where they want to?
Answers
Answer:
hi my Friend
check in this link https://youtu.be/ErFP7VmNbGk
Explanation:
what is the mechanical advantage of a first class lever that has an input force of 200 N and produces and output force of 1300 N
Answers
How much gold already at its melting point would melt if 6000 Joules of thermal energy were used to heat it?
For gold the specific latent heat of fusion is 120 000 J/kg and the specific latent heat of vaporisation is 64 000 J/kg.
ASAP please the assignment is due tonight.
Answers
Answer:
Explanation:
To determine how much gold would melt when 6000 Joules of thermal energy is used to heat it, we need to consider the specific latent heat of fusion and the specific latent heat of vaporization for gold.
Since we are heating the gold to its melting point but not beyond, we only need to consider the specific latent heat of fusion.
The specific latent heat of fusion for gold is given as 120,000 J/kg, which means it takes 120,000 Joules of thermal energy to melt 1 kilogram of gold.
To find out how much gold would melt with 6000 Joules of thermal energy, we can use the following equation:
Amount of gold melted = Thermal energy / Specific latent heat of fusion
Amount of gold melted = 6000 J / 120,000 J/kg
Simplifying the equation:
Amount of gold melted = 1/20 kg
Therefore, with 6000 Joules of thermal energy, approximately 1/20 kg or 0.05 kg (50 grams) of gold would melt at its melting point.
What is the conversation of energy
Answers
Answer:
The conservation of energy is a principle where according to which the energy of interacting bodies or particles in a closed system remains constant.
Explanation:
Answer:
a principle stating that energy cannot be created or destroyed, but can be altered from one form to another.
to charge a 1-f capacitor with 2c requires a potential difference of
Answers
The potential difference required is V = 2 Volts.
To charge a 1 Farad (F) capacitor with a charge of 2 Coulombs (C), you can use the formula Q = CV, where Q is the charge, C is the capacitance, and V is the potential difference.
Rearrange the formula to solve for V: V = Q/C
Now, plug in the given values: V = 2C/1F
The potential difference required is V = 2 Volts.
When work is done on a charge to change its potential energy, the electric potential difference is the difference in electric potential (V) between the final and the original position. ΔV is used to represent it.
ΔV = Vₓ - Vₐ
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You are riding on a Ferris wheel that is rotating with a constant speed. The car in which you riding always maintain its correct upwards orientation; it does not invert.
a. What is the direction of the normal force on you from the seat when you are at the top of the wheel?
i. upward, ii. downward, iii. impossible to determine
b. From the same choices, what is the direction of the net force on you when are at the top of the wheel?
Answers
You are riding on a Ferris wheel that is rotating with a constant speed.
a. The direction of the normal force on you from the seat when you are at the top of the wheel is upwards.
b. The direction of the net force on you when you are at the top of the wheel is neither upwards nor downwards as the value of it is zero.
When we draw a free-body diagram of a ferris wheel, we have normal force directed upwards and m(g - a) directed downwards. This is because we have gravitational force and acceleration of the wheel in the opposite direction to each other.
The net force on the wheel is zero so that we do not either fly upwards or fall down. This helps us to maintain balance on the Ferris wheel.
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Electrons are charged particles. The amount of charge that passes per unit time is called potential. current. voltage.
Answers
The amount of charge that passes per unit of time is called current. Current is a measure of the flow of electric charge through a circuit or conductor.
It is defined as the amount of charge passing through a given point per unit time, typically measured in amperes (A). Electric current is caused by the movement of charged particles, such as electrons, in a conductor under the influence of an electric field. Current can be either direct current (DC), which flows in one direction, or alternating current (AC), which periodically reverses direction. The flow of current is essential for the operation of many electrical devices, including lights, motors, and electronic devices.
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First come first serve, solve it properly and get points.
Answers
Answer:
Explanation:
Box 1: heat, metals, independent
Box 2: metals, insulators, dependent
Box 3: attracted, metals, independent
When a cold air mass and a warm air mass meet but are at a standstill, the boundary is called.
Answers
When a cold air mass and a warm air mass meet but are at a standstill, the boundary is called a stationary front. This is a boundary between two air masses, one of which is warmer and the other of which is colder.
When they meet, they cannot mix because of their differences in temperature and density. As a result, they remain stagnant and stationary. The cold front is a front formed when a cold air mass displaces a warm air mass, and the warm front is a front formed when a warm air mass displaces a cold air mass.
However, a stationary front is formed when neither air mass advances. A stationary front is identified by the blue triangles and red half-circles that alternate on opposite sides of a line on a weather map. A stationary front produces cloudy skies and moderate rainfall or snowfall.
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If you were a brilliant cientit, what would you hope to invent or achieve?
How might it change the live of people in the future?
Answers
If I were a scientist and I would have wanted to invent and achieve. I would have wanted to invent a vaccine for cancer disease.
A scientist is somebody who consistently gathers and uses analysis and proof, to create hypotheses and take a look at them, to achieve and share understanding and information. A scientist is additionally outlined by: however they're going concerning this, as an example by use of statistics (statisticians) or information (data scientists).
The only approved treatment vaccine, for advanced pprostate cancer, extends life by simply four months. Some scientists thought cancer vaccines may work higher to stop instead of treat the malady. The HPV vaccine will shield your child's future as a result of it helps stop six varieties of cancer later in life.
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During an observation, it was noticed that light diffracts as it passes through small slits in a barrier. What does this evidence reveal about light? (2 points)
Answers
Answer:
It reveals that light is a wave
Explanation:
Diffraction is the property of a wave in which there is a bending of the wave about the corners of an obstacle or aperture into the geometrical shadow of the obstacle or aperture.
This simply implies that a wave bends or spreads out when it passes through openings. Since the light diffracts through small slits and diffraction has been shown to occur in water waves and sound waves, this property of diffraction can only be characteristic of a wave and thus, this evidence reveals that light is a wave.
Answer:
It shows that light can travel in different wavelengths.
Explanation:
Light is similar to a wave in the way that it travels in a straight line, but when it is passing through the slits, it diffracts due to this difference. Therefore, light refracts in the same way as a wave would, and it is a mode of transferring energy. The light travels in a way similar to a wave
The following diagram shows a person exerting a
300.-newton force on the handle of a shovel that
makes an angle of 60. with the horizontal ground.
Determine the magnitude of the component of the
force perpendicular to the ground.
Answers
Answer:
260 Newtons
Explanation:
Okay, so what you have to do is know what the question is asking. It wants to know the force perpendicular to the ground. We know perpendicular makes a right angle, so we use the diagram to make it into a right triangle with a degree of 60, and hypotunese of 300 newtons. Now, we use basic trigonometry, we place x on the horizontal side since it perpendicular to the ground. We know it´s sin because x is opposite to 300 which is the hyp.
Sin= opp/hyp
x/300
sin(60)= x/300
300*sin(60)= 259.8, which rounds to
260 Newtons
There is your answer :D. Happy to help.
The component of the force which is perpendicular to the ground is → F [y] = 261 a[y].
What are the components of a Vector?A vector V making an angle θ with the x - axis, can be resolved into two two components along the x and y - axes respectively as →
V = Vcosθ a[x] + Vsinθ a[y]
where -
a[x] is the unit vector along the +x axis
a[y] is the unit vector along the +y axis.
Given is a force of magnitude 300 N acting on the handle that makes an angle of 60° with the horizontal ground.
The component normal to the ground will be the component along the y - axis. The component along the y - axis is the sine component. Suppose that vector F represents the force of magnitude (|F|) 300 N. The component perpendicular to the ground will be -
F [y] = |F| sinθ a[y]
F [y] = 300 x sin(60°) a[y]
F [y] = 300 x 0.87
F [y] = 261 a[y]
Therefore, the component of the force which is perpendicular to the ground is → F [y] = 261 a[y].
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The attachment is here. It is physics/chem.
Answers
Answer:
Can some body plz explain me plzzz
the student measures the length of half a wavelength using a ruler. describe how she could use this measurement and information from the signal generator to calculate the speed of the wave on the string
Answers
Answer:
read section b :)
Explanation:
To measure the speed of the wave on the string, the wavelength, and frequency are required. So by calculating the wavelength, the speed can be calculated.
What is wavelength?The distance between two adjacent crests can be used to calculate a transverse wave's wavelength. The distance between two adjacent compressions can be used to calculate the wavelength of a longitudinal wave.
The wave speed can be determined using this equation if the wavelength and frequency are known. The quantity of waves that move in a wave's frequency is measured in waves per second.
Speed = Wavelength x Frequency).
Therefore, the wavelength and frequency of the wave on the string must be determined in order to calculate its speed. Consequently, the speed can be estimated by determining the wavelength.
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Calculate the potential at the centre of a square of side √4.5 m which carries at its
four corners and charges of + 5 x 10° C, 2 x 10°C, -5 x 10° C and - 7 x 10°C
respectively
Answers
Thus, the total potential is then V_total = \(-1.2 * 10^9V\)
How to solve
The potential at a point due to a charge is given by V = kQ/r, where k is Coulomb's constant (~\(9x10^9 Nm^2/C^2\)), Q is the charge, and r is the distance from the charge.
The total potential at the center of the square is the sum of the potentials due to each charge.
The distance of each charge to the center is half the diagonal of the square, which is \(\sqrt2 * side/2 = \sqrt2 * \sqrt4.5/2 = 1.5m.\)
The total potential is then V_total
= \(k * [(510^8/1.5) + (210^8/1.5) - (510^8/1.5) - (710^8/1.5)] = -2 * k * 10^8 / 1.5 \\= -1.2 x 10^9 V.\)
Thus, the total potential is then V_total = \(-1.2 * 10^9V\)
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An object that is slowing down can be described as:______.
Answers
Answer: an object with much friction
Explanation:
I read about it good luck
I have a project of how a steam engine works
pls tell me what i should research on or give ideas
Answers
In the metal junction box, insert the dowel rod and skewer so that the skewer is pointing up within the copper pipe.
How is the steam engine operated?A steam engine is a heat engine that uses steam as its working fluid to carry out mechanical work. The steam engine moves a piston back and forth inside a cylinder using the force created by the pressure of the steam. A connecting rod and crank can convert this pushing force into a rotational force for work.
How are steam engines employed in modern times?Technological devices have changed how people live. Nowadays, steam is used to propel ships and turn massive turbines that produce electricity for billions of people worldwide.
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could you help with question 5. Your solutions to the word problems in volving Newton's Laws should have the following features:Each solution should begin with one or more free body diagrams with a sign convention.The solution process should follow the GRASP process.Formulae should always be used in a three-step process: formula with letter variables, substitution of values, and then the answer.Answers should be expressed with the correct number of significant digits and with the direction if required.
Answers
ANSWER:
(a) 20 m/s^2
(b) 250 m
STEP-BY-STEP EXPLANATION:
Given:
Mass (m) = 250 g = 0.25 kg
Force (F) = 20 N
Frictional force (Ff) = 15 N
(a)
The net force on the block is:
\(\begin{gathered} F_{net}=F-F_f \\ F_{net}=20-15 \\ F_{net}=5\text{ N} \end{gathered}\)We know that:
\(\begin{gathered} F=m\cdot a \\ \text{ We replacing} \\ 5=0.25\cdot a \\ a=\frac{5}{0.25} \\ a=20\text{ m/s}^2 \end{gathered}\)(b)
We can calculate the partial distance from the following equation:
initial velocity (u) = 0 (start from rest)
\(\begin{gathered} s=ut+\frac{1}{2}at^2 \\ \text{ we replacing} \\ s=0\cdot5+\frac{1}{2}\cdot20\cdot5^2 \\ s=250\text{ m} \end{gathered}\)the unit of energy is a derived unit
Answers
Explanation:
Hi, there!!
Energy is defined as the capacity or ability to do work. It's SI unit is Joule.
here,
Joule = (kg×m×m)/(s×s)
= kg×m^2/s^2.
Therefore, the derived unit is kg.m^2 by s^2.
Hope it helps...
What is the time period of a 40 Hz wave?
Answers
Answer:
0.025 secs
Explanation:
Answer:
The formula for time is: T (period) = 1 / f (frequency). λ = c / f = wave speed c (m/s) / frequency f (Hz). The unit hertz (Hz) was once called cps = cycles per second.
Explanation:
~Cornasha_Weeb
A body is found at 9:30pm. The temperature of the liver registers 84.6F what is the approximate TOD of the victim
Answers
The approximate TOD of the victim is Maybe around 4:30 pm.
How can you gauge the temperature of your liver?The liver temperature can provide a more accurate representation of the genuine core body temperature, hence it is ideal to take the temperature either rectally or by monitoring the liver temperature.To do this, a tiny incision must be made in the right upper belly, and the thermometer must be inserted into the liver tissue.
How is the death date determined?This stiffening process, known as rigor mortis, occurs at a fairly known time, making it possible to predict when someone will pass away.In overall: If the body is warm and there is no rigidity, the time of death was less than three hours ago.If the body is stiff and warm, death happened 3 to 8 hours earlier.
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A 0.25 kg book falls off a 2 m shelf on to a 0.5 m chair. What was the change in GPE?
Answers
The equation of GPE is mgH, where m is mass, g is gravitational acceleration, and H is the height.
If we're solving for the change in GPE, then:
∆\(U_{g}\) = mg∆H
Input our given values for m and g:
∆\(U_{g}\) = 0.25 * 9.80 * ∆H
The book falls from 2 meters high to 0.5 meters high, so:
∆\(U_{g}\) = 0.25 * 9.80 * (2.0 - 0.5)
∆\(U_{g}\) = 0.25 * 9.80 * 1.5
∆\(U_{g}\) = 3.675 (J)
Adjust for significant figures:
∆\(U_{g}\) = 3.7 (J)
The change in gravitational potential energy was 3.7 (J)
If you have any questions on anything I did to get to the answer, just ask!
- breezyツ