Meeeeeeeee............!
Which object is most efficient?
a. A heat engine that produces 30 J of work for 60 J of input energy.
b. A heat engine that produces 15 J of work for 30 J of input energy.
c. A heat engine that produces 20 J of work for 60 J of input energy.
d. A heat engine that produces 40 J of work for 50 J of input energy.
Answer:
It is b
Explanation:
ANSWER ASAP!!!!!!!!
Southwest Airlines has two mission statements: one for customers and one for _____ .
Answer:
Employees
Explanation:
1) The corporate mission statement of Southwest Airlines states that the airline is focused on the provision of the high quality customer service that will also be given with kindness, a good nature, pride that reflect the essence of the Company
2) The mission statement for the employees is the provision of an equal opportunity and stable work environment that promotes personal development and learning.
The block in the drawing has dimensions L0×2L0×3L0,where L0 =0.5 m. The block has a thermal conductivity of 300 J/(s·m·C˚). In drawings A, B, and C, heat is conducted through the block in three different directions; in each case the temperature of the warmer surface is 37 ˚C and that of the cooler surface is 8 ˚C Determine the heat that flows in 3 s for each case.
The drawing showing the block is missing, so i have attached it.
Answer:
Q_p = 19575 J
Q_o = 8700 J
Q_g = 78300 J
Explanation:
We are given L0 = 0.5 m
From the image, we can see that;
Length; L = 3L0 = 3 × 0.5 = 1.5 m
Width; W = L0 = 0.5 m
Height; H = 2L0 = 2 × 0.5 = 1 m
Temperature of warmer surface; T_h = 37 ˚C
Temperature of cooler surface; T_l = 8 ˚C
thermal conductivity; k = 300 J/(s·m·C˚)
Time for which the heat flows; t = 3 s
Now, from Fourier's law of conduction, the rate of heat flow is given by;
Q/t = kA(dT/dx)
Where;
A is area
dt is change in temperature = 37 - 8 = 29°C
dx is perpendicular distance
Now, for the amount heat flow perpendicular to the pink surface, from the image dx will be the height 1 m.
Thus;
Q_p/3 = 300 × (1.5 × 0.5) × (29/1)
Q_p/3 = 6525
Q_p = 3 × 6525
Q_p = 19575 J
for the amount heat flow perpendicular to the orange surface, from the image dx will be the length 1.5 m.
Thus;
Q_o/3 = 300 × (1 × 0.5) × (29/1.5)
Q_o/3 = 2900
Q_o = 2900 × 3
Q_o = 8700 J
for the amount heat flow perpendicular to the green surface, from the image dx will be the width 0.5 m.
Thus;
Q_g/3 = 300 × (1 × 1.5) × (29/0.5)
Q_g/3 = 26100
Q_g = 26100 × 3
Q_g = 78300 J
What is the formula of Kinetic Energy
K.E = ½ mv²
Explanation:
The formula of Kinetic Energy
K.E = ½ mv²
Where,
m = mass of object
v = velocity of object
The Standard Unit of kinetic energy is Joule, while the Imperial Unit of kinetic energy is foot-pound
-TheUnknownScientist
Answer:
[tex]\boxed{\bold { \large { \boxed {KE=\frac{1}{2} mv^2}}}}[/tex]
Explanation:
Kinetic energy formula
[tex]\displaystyle KE=\frac{1}{2} mv^2[/tex]
[tex]\displaystyle KE \Rightarrow \sf kinetic \ energy \ (J)[/tex]
[tex]\displaystyle m \Rightarrow \sf mass \ (kg)[/tex]
[tex]\displaystyle v \Rightarrow \sf velocity \ (m/s)[/tex]
Please explain the different ways offense can score and how many points each way is worth? Answer in complete sentences.
Answer:
what sport bruh
Explanation:
Answer:
in wat sport exactly
Explanation:
in eat sport
What change of state occurs during vaporization? liquid to gas gas to liquid solid to liquid liquid to solid
Answer:
A is correct!
Explanation:
e2020
Answer:
a
Explanation:
right on edge :)
elastic collision is a collision in which there is absolutely no loss of kinetic energy true or false
A rock is thrown horizontally from a building at 15 m/s. It hits the ground 45 m from the base of the building. How high was the building?
Answer:
Explanation:
hope this helps!
A car speeds up from 14 meters per second to 21 meters per second in 6 seconds. Whats the acceleration and the distance passed within that time?
Answer:
a = 1.666... m/s²
Explanation:
a = v2 - v1 / t2 - t1
a = 21m/s - 14m/s / 6s - 0s
a = 7m/s / 6s
a = 1.666... m/s²
Your best friend has very low energy levels and complains of not being able to sleep at night. Determine the BMI score that would most likely contribute to this problem.
14
20
22
23
Answer: 14
Explanation: 20-23 is normal.
Answer:14
Explanation:hope this helps
Please Help!!
Thankss
Answer:
The roller coaster gains potential energy as they reach the top of the hill. And then the energy changes to kinetic energy.
Explanation:
HELLLPPP
why didnt people in marie curies time realize radioactivity could be harmfull?
Answer:Health
Throughout her work with radium, Marie was unaware of the effects of radioactivity exposure on the body. In her lab, she would keep tubes of radium in her pocket. [3] She began to suspect that radium negatively impacted health when one of her fellow researchers died of a blood disease, and then a few years later her personal assistant died of a blood disease. Even though she suspected that radium exposure was bad for her health, she did very little to monitor her own blood. In 1932, she broke her wrist and the break took much longer to heal than it should have. She then began to notice that her vision was deteriorating and radiation burns on her fingers were becoming more and more painful. Some days she felt too ill to even go to the lab, and finally on July 4, 1934, Marie died from aplastic anemia. [1]
Radium Exposure Treatments
Marie suspected that her health was being negatively impacted by radium exposure, but did nothing about it, most likely because there weren't any effective treatments for radium poisoning yet. At the time, scientists knew that radium was metabolized like calcium. In an attempt to remove it from the system, they manipulated calcium intake. [4] This caused little to no improvements, so parathyroid hormone was added to the treatment. Again, there was some reduction of radium, but not a significant amount. It wasn't until after Marie's death that they realized once radium is in the bones, it is extremely difficult to extract. The lack of therapies for radium exposure may explain why Marie just ignored her symptoms, because she was fully aware of her fate. [4]
© Jenna Gray. The author warrants that the work is the author's own and that Stanford University provided no input other than typesetting and referencing guidelines. The author grants permission to copy, distribute and display this work in unaltered form, with attribution to the author, for noncommercial purposes only. All other rights, including commercial rights, are reserved to the author.
Explanation:
Answer:
cause they were dumb
Explanation:
A 2.80 kg mass is dropped from a height of 4.50 m . Find its potential energy (PE) at the moment it is dropped .
Answer:0
Explanation:
because it ran out when it hit the ground
Rubidium forms the positive ion Rb+. Does this ion have more or fewer electrons than the neutral atom?
Answer:
The ion has fewer electrons
Explanation:
As Rubidium forms a positive ion Rb⁺ the number of electrons becomes fewer for the atom.
A positive charge on an ion indicates that the number of protons for the atom is greater than the number of electrons. This leaves a net positive charge on the atom.For a negatively charged ion, the number of electrons is more than the number of protons because they have gained additional electrons. In a neutral atom, the number of protons and electrons are the same.Rubidium forms the positive ion (Rb+) because it has fewer electrons than the neutral atom.
HOW DOES AN ATOM BECOME POSITIVELY CHARGED:
An atom is the smallest indivisible particle of an element. It consists of three subatomic particles namely: proton, electron and neutron. Proton is the positively charged component (+) while electron is the negatively charged component (-). The proton and electron number is equal in a neutral atom. An atom becomes positively charged when it loses electrons. The number of protons becomes more in a positively charged atom. For example, Rubidium forms the positive ion (Rb+) because it has fewer electrons than the neutral atom.Learn more at: https://brainly.com/question/12065456?referrer=searchResults
A 30 kg TV falls out of a 5 meter high window, reaching a
maximum speed of 10 m/s. What is the TV's momentum just
before it hits the ground?
Answer:
300kgm/s
Explanation:
Given parameters:
Mass of TV = 30kg
Height of building = 5m
Maximum speed = 10m/s
Unknown:
Momentum before it hits the ground = ?
Solution:
Momentum is the quantity of motion a body possess or contains. It is expressed as;
Momentum = mass x velocity
Insert the parameters and solve;
Momentum = 30 x 10
Momentum = 300kgm/s
Hi sorry for yesterday
Explanation:
any two instruments based on Pascal's law
Answer:
Answer: hydraulic press and hydraulic brakes. ... This law is useful in designing instruments like Bramah press ,Hydraulic press , Hydraulic jack etc. It is the principle in the development of hydraulic brakes , that are used in automobiles. It is also known as law of transmission of fluid pressure
proof of conservation of energy
Litmus paper strips were dipped in two different unknown liquids. The table below shows the pH of the two liquids: Litmus Test for Unknown Liquids Litmus Paper Strip pH of Liquid X 9 Y 4 What will happen to the litmus strips?
Answer:
Both will turn red
Both will turn blue
X will turn red and Y will turn blue
X will turn blue and Y will turn red
Answer:
X will turn blue and y will turn red
Explanation:
Since X has a pH of 9, it will turn blue because anything with a pH higher than 7 turns blue. Since Y has a pH of 4, it will turn red because anything with a pH lower than 7 turns red.
4. A trolley of mass 2kg rests next to a trolley of mass 3 kg on a flat
bench as shown in the diagram. When the spring is released
between the trolley's, they pushed apart. The 2kg travels to left at a
velocity of 6m/s.
a. What is the total momentum of the trolleys before
separation?
b. What is the total momentum of the trolleys after
separation?
c. What is the momentum of of 2kg trolley after
separation
d. What is the momentum of 3kg trolley after separation?
e. What is the velocity of the 3kg trolley?
Answer:
a. The total momentum of the trolleys which are at rest before the separation is zero
b. The total momentum of the trolleys after separation is zero
c. The momentum of the 2 kg trolley after separation is 12 kg·m/s
d. The momentum of the 3 kg trolley is -12 kg·m/s
e. The velocity of the 3 kg trolley = -4 m/s
Explanation:
a. The total momentum of the trolleys which are at rest before the separation is zero
b. By the principle of the conservation of linear momentum, the total momentum of the trolleys after separation = The total momentum of the trolleys before separation = 0
c. The momentum of the 2 kg trolley after separation = Mass × Velocity = 2 kg × 6 m/s = 12 kg·m/s
d. Given that the total momentum of the trolleys after separation is zero, the momentum of the 3 kg trolley is equal and opposite to the momentum of the 2 kg trolley = -12 kg·m/s
e. The momentum of the 3 kg trolley = Mass of the 3 kg Trolley × Velocity of the 3 kg trolley
∴ The momentum of the 3 kg trolley = 3 kg × Velocity of the 3 kg trolley = -12 kg·m/s
The velocity of the 3 kg trolley = -12 kg·m/s/(3 kg) = -4 m/s
a-The total momentum of the trolleys before separation=0
b.The total momentum of the trolleys after separation=0
c. The momentum of 2kg trolley after separation=12kg-m/sec
d. The momentum of 3kg trolley after separation=-12kg-m/sec
e. The velocity of the 3kg trolley=4kg-m/sec
Given-
Trolley A with mass= 2kg
Trolly B with mass= 3kg
Velocity of trolly A =6m/sec
A- Total momentum of the trolleys before separation-
Here, in this problem both the trolleys are in the rest position hence the momentum of both trolleys = 0
B- Total momentum of the trolleys after separation-
We know that motion never changes in an isolated collection of objects,
hence the momentum of the trolleys before and after the separation=0
C- Momentum of the Trolley A (2kg)-
It is known that momentum= Mass x Velocity
[tex]P=m\times v[/tex]
[tex]P=2\times 6[/tex]
[tex]P=12[/tex]
Hence, the momentum of the 2kg trolley is 12 kg-m/sec
D- Momentum of the Trolley B (3kg)-
As we know that motion never changes in an isolated collection of an object hence the total moment of after saparation = 0
hance the momentum of the trolley B will be equal and opposite to the momentum of trolley A=
[tex]P= -12[/tex]
Momentum of trolley B (3kg) is -12kg-m/sec
E- The velocity of the 3kg trolley-
The momentum of trolley A= Momentum of trolley B
[tex]m_{b} v_{a} =m_{b} v_{a}[/tex]
[tex]-2\times 6=3\times v_{a}[/tex]
[tex]v_{a}=-4[/tex]
The value of the velocity of the 3kg trolley is -4m/sec
For more about the momentum, follow the link below-
https://brainly.com/question/4956182
A wire having resistance 1 ohm is stretched to double its length. what is its new resistance?
Answer:
1 ohm
Explanation:
resistance doesn't depend upon the length of the material as the material is same
The angle between the incident ray and reflected ray is 1000. What is the value of angle of incidence?
Answer:
straight anglei think
2.05 × 108 kg of water is pumped up through a vertical height of 500 m.
Answer:
1 x 10¹²J
Explanation:
Given parameters:
Mass of the water pumped = 2.05 x 10⁸kg
Height = 500m
Unknown:
Potential energy = ?
Solution:
The potential energy amassed by water at this height is expressed as;
P.E = mgH
m is the mass
g is the acceleration due to gravity
H is the height
Insert the parameters and solve;
P.E = 2.05 x 10⁸ x 9.8 x 500 = 1 x 10¹²J
What is momentum of a 3kg bowling ball that is rolled at 4 m/s
A spring is 17 cm long when it is lying on a table. One end is then attached to a hook and the other end is pulled by a force that increases to 25 N, causing the spring to stretch to a length of 19.2 cm. How much work was required to stretch the spring?
A. 3.13 J
B. 0.552 J
C. 1.67 J
D. 0.276 J
Answer:
D. 0.276 J
Explanation:
When I solved this, I got 0.275, so I chose the one closest.
To solve:
convert 17 cm and 19.2 cm to 0.17 m and 0.192 m
W(on spring) = 1/2 (0.192 m - 0.17 m)(25N)
= 1/2 (.022 m)(25 N)
= 0.275
D. 0.276 J
What is the work?Work is force applied over distance.
Examples of work include lifting an object against the Earth's gravitation, driving a car up a hill, and pulling down a captive helium balloon.
Work is a mechanical form of energy.
The standard unit of work is the joule (J), equivalent to a newton - meter (N · m).
According to the question,
W = Fs
Convert 17 cm and 19.2 cm to 0.17 m and 0.192 m
W = [tex]\frac{1}{2}[/tex](0.192 m - 0.17 m)(25N)
=[tex]\frac{1}{2}[/tex] (.022 m)(25 N)
= 0.276 J
Learn more about work here:https://brainly.com/question/18094932
#SPJ2
NEED HELP ASAP, WILL GIVE BRAINLIEST
Which is an example of convection currents?
marshmallows toasting over a campfire
a pot being heated by an electric burner
feet getting hot when stepping across sand
a radiator emitting warm air and drawing in cool air
Answer: A radiator emitting warm air and drawing in cool air.
This is due to the warm air expanding and begins to rise as it is less dense. The cool air begins to "fall" as it is denser, drawing nearer to the radiator. The radiator will then heat the cool air and it will rise. The process then continues
Answer:
It's D
Explanation:
Can't explain I'm taking a timed test(not including this question it wass related to what I looked up)
Byeee!
I hope this helped!
Explain a situation in which a lighter object would take more work to move than a heavier object
Answer: The lighter object could be pushed up a much steeper incline and for a much longer distance.
Explanation: Using the formula for work, W= F d cosФ, you can see that it takes into account distance and the angle of the incline. With a much larger incline and with much more distance to cover, eventually the lighter object would require more work than a heavier object with no incline and very little distance to cover.
I have been trying to do number 2 and I just don’t know what the answer is if you can help me thank you so mush
Answer:
Strong Positive Linear Line Correlation
Explanation:
According to the diagram, there is a strong positive linear line correlation between velocity and distance of galaxies. Hubble showed that galaxies are receding away from people with a velocity that is proportional to their distance from people more distant galaxies recede faster than nearby galaxies.
About the diagram: Velocity is the distance relation among extra-galactic nebulae. Radial velocities is corrected for solar motion, are plotted against distances estimated from involved stars and mean luminosities of nebulae in a cluster. The black discs and full line represent the solution for solar motion by using the nebulae individually; the circles and broken line represent the solution combining the nebulae into groups; the cross represents the mean velocity corresponding to the mean distance of 22 nebulae whose distances could not be estimated individually.
Calculate the mechanical advantage if a machine allows you to move a 60 newton rock by only exerting 15 newtons of force.
Answer:
4 Newtons
Explanation:
I think it's 4 because mechanical advantage = output force/input forceSo, it would be 60/15, which is 4 newtonsAnswer:
4
Explanation:
Which two foods are most like homogeneous mixtures?
A. Tossed Salad
B. Trail mix
C. Mayonnaise
D. Mustard
Answer: It’s most likely Mayonnaise and mustard.
Explanation: It’s definitely mayonnaise because it’s not possible to see the different substances and for mustard it depends on what type. Hope this helps. Good luck :)
Answer:
Mayonnaise and mustard.
Explanation:
PLEASE HELP 100 POINTS!!!!!
Study this image of the process of photosynthesis. What’s wrong with the image?
A. Sun rays are shown on the right side of the image.
B. Carbon dioxide is shown as an input.
C. Oxygen is shown as an input.
D. Water is shown as an input.
Answer:
C
Explanation:
Carbon dioxide should be the input, and oxygen should be the output.
Answer:
c
Explanation:
i got it right :D