Answer:
Explanation:
Theoretical efficiency = T₁ - T₂ / T₁ where T₁ and T₂ is absolute temperature of hot and cold end of the heat engine.
= 600 / (273 + 700 )
= 600 / 973
= .6166
operating efficiency = 40% of .6166
= .4 x .6166
= .2466 = 24.66 %
efficiency = work output / heat input
= 5000 / heat input = .2466
heat input = 5000 / .2466
= 20275.75 J .
HEAT EXTRACED = 20275.75 J.
You travel 200 m in 120minutes. What is your speed in miles per hour?
Answer:
100
Explanation:
60 minutes is an hour and there are 120 minutes so there are 2 hours. You divide 200 m by 2 and you get 100.
A measure of the body's resting energy expenditure based on data that is collected four hours after eating or physical activity is called the _________?
2. You are stirring some soup on the stove and you notice that the metal spoon is getting hot.
What type of heat transfer?
i need help with 1-10
Answer:
1) C. Energy
2) A. Joule
3) D. Joule
4) B. Potential
5) A. Greater
6) C. Largest
7) A. Speed and mass
8) A. Kinetic
9) A. Kinetic
10) D. Height and mass
the main purpose of the turbine in a turbojet engine is to
Answer:
The main purpose of the turbine in the turbojet engine is to Drive the compressor.
Explanation:
It's the space between two object
5 Letter word
Answer:
Matter? Atoms? Oxygen Molecules?
A toy cart with a weight of 10N moves with a constant velocity of 2 m/s to the right on a horizontal table. According to Newton's Laws of Motion, which of the following statements is correct?
a
The table exerts a force of 10N upward on the toy cart.
b
The toy cart exerts a force of 10N upward on the toy table.
c
The toy cart exerts a force of 2N downward on the table.
d
The toy cart exerts a force of 2N to the right on the table.
Answer:
Its A ik cuz i just studied it when i was answering this question...
Explanation:
have a good day!
what type of galaxy tends to be the oldest? Explain.
Answer:
Elliptical galaxies, such as M87, are the oldest and roundest galaxies in the universe. Astronomers think these galaxies are formed in major mergers—dramatic collisions between galaxies that result in one massive galaxy being entirely consumed by another.
Explanation:
hope this helps...
have a good day...
help me with this question plz
Answer:
Greatest position of the ball are z
. 8 quarts = ________ pints 12 pints 10 pints 4 pints 16 pints
Answer:
According to my calculations it equals to 16 pints
Explanation:
You know that there is a calculator online for this stuff right?
what is jello tell me i know lets see if you know
what’s the equation for this
How are infrared waves and radio waves similar? How might you use each?
Answer:
They are both eletro-magnetic waves, they are both outside of the range humans can see with our eyes. Infrared waves can can carry enough energy to give heat to objects. There is a lot of Infrared light that is put out by a fire and we feel that as the heat. Radio waves can be used to carry other signals like when we listen to the radio.
Explanation:
Answer:
Both infrared and radio waves are longer than visible light and are not considered harmful to humans.Infrared light is how remote controls communicate with electronics like televisions and stereos, while radio waves are how cell phone signals are transmitted.
Explanation:
This is what my teacher wrote as the answer lol.
Which of these descriptions best defines the solar system?
A. planets and asteroids
B. the sun and all planets
C. planets and their moons
D. the sun and all bodies that travel around it
Answer:
d
Explanation:
d because the sun is in the center and everything else surrounds it
A 4kg object has a momentum of 12 kg*m/s, what is the objects velocity?
Answer:
3m/s
Explanation:
momentum=mass x velocity
to find velocity...
we change subjects and make velocity the subject,thus , velocity=momentum/mass
v=12/4 =3m/s.
A small dog walks 12 meters east and then 5 meters north. How many meters is the dog from her starting position?
Answer:
17 meters
Explanation:
because 12 meters +5 meters =17 meters
The distance from Earth to the North Star is about 430 light-years. Which of the following statements describes why scientists use the light-year unit to measure distance in space?
A.) A light-year is very small and distance in space are very small
B.) A light-year unit is very small and the distance in space are very large
C.) A light-year unit is very large and distance in space are very small
D.) A light-year unit is very large and distance in space are very large
Answer:
D
Explanation:
D
Ball A is projected vertically upwards at a velocity of 16m.s-¹ fron the ground. ignore the effects of air friction. use the ground as zero reference. a) calculate the time taken by ball A to return to the ground. b) draw a velocity time graph for ball A
Answer: 3.26 s
Explanation:
Given
The ball is projected upward with a velocity [tex]u=16\ m/s[/tex]
Using the equation of motion
[tex]s=ut+\frac{1}{2}at^2[/tex]
Here, displacement is zero as the ball returns to its initial position
[tex]\Rightarrow 0=16\times t-0.5\times g\times t^2\\\Rightarrow t(16-0.5\times 9.8\times t)=0\\\text{i.e.}\ t=\dfrac{16}{4.9}=3.26\ s[/tex]
the velocity of the ball at any instant is given by
[tex]v=u+at\\v=16-9.8t[/tex]
Can someone please help me and i will give brainliest if i can.
Answer:
Because 1 change in one factor can effect the other and that one can effect the other and so on and so on.
So, let's just say water were to stop flowing, how would the oceans take that? How would precipitation take it?
6. Ella holds an ice cream cone in her hand. She soon notices that her hand begins
to feel cold. What is different about the particles that make up her hand?
A They are getting larger.
B They are gaining average energy.
C They are moving slower on average.
D They are joining together.
Answer:
C
Explanation:
the ice cream is transferring the coldness into her hand and slowing down the particles. hot means they move faster, cold is to slow down
hewo (´▽`ʃ♡ƪ)
if u report your a b/i/t/c/h
Answer:
hai >.<
Explanation:
Answer:
hello!
Explanation:
~evita
HERES THE ANSWER AND QUESTION
Check all that are solutions of the inequality.
-1.2
0
-1.4
Negative 1 and one-third
-1.25
-1
THE ANSWER IS A,B,F
Answer:
agree
Explanation:
Answer:
THE ANSWER IS A,B,F
Explanation:
Kelly sits on a rock in a field. Which of the following examples correctly name force pairs? Select all that apply.
А
Kelly pushes on the rock, and the rock pushes on Earth.
B
Earth pulls on Kelly, and Kelly pulls on Earth.
с
The rock pushes on Earth, and Earth pulls on the rock
D
Kelly pushes on the rock, and the rock pushes on Kelly.
Answer:
A
Explanation:
A marble is thrown horizontally with a speed of 15.0 m/s from the top of a building. When it strikes the ground, the marble has a velocity that makes an angle of 65.0° with the horizontal. From what height above the ground the marble was thrown. How far from the base of the building, did the marble land?
A pendulum has a mass of 0.060 kg swinging at a small angle from a light string, with a period of 1.4 s. What is the length of the pendulum?
Answer:
0.5 m
Explanation:
From the question given above, the following data were obtained:
Mass (m) = 0.060 kg
Period (T) = 1.4 s
Lenght (L) =?
NOTE:
1. Acceleration due to gravity (g) = 10 m/s²
2. Pi (π) = 3.14
The length of the pendulum can be obtained as follow:
T = 2π√(L/g)
1.4 = 2 × 3.14 × √(L/10)
1.4 = 6.28 × √(L/10)
Divide both side by 6.28
1.4 / 6.28 = √(L/10)
Take the square of both side
(1.4 / 6.28)² = L/10
Cross multiply
L = 10 × (1.4 / 6.28)²
L = 0.5 m
Therefore, the length of the pendulum is 0.5 m
Answer:0.49
Explanation:
Khan academy
What causes the apparent colors of the objects we see?
Answer: The human eye and brain transform light into color. Allowing us to see them.
Explanation: Light receptors within the eye turn light into color. The color that is reflected off of an object, is what we see. Hope this helps.
The apparent colors of the objects we see causes due to reflection of the light which they absorb and emit.
What is reflection?Reflection is the change in direction of a wavefront which occurs at an interface present between the two different media so that the wavefront of the wave returns into the medium from which it has been originated. Common examples of reflection include the reflection of light, sound wave and water waves.
The color of an object is the wavelengths of light waves that it reflects. The reflection is determined by the arrangement of electrons in the atoms of that substance which will absorb and re-emit photons of particular energy levels according to the quantum laws.
Learn more about Reflection here:
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help pls this is for science
Answer:
It's a transverse wave.
Nuclear energy is released during____.
SELECT ALL THAT
1. Chemical reactions
2. Fission
3. Radioactive decay
4. Breakup of molecular bonds
5. Induced splitting of atoms
Answer: fission and radioactive decay
And induced splitting of atoms
Explanation:
A jet plane can travel at a speed of 600 km/h. How far will the jet travel if it flies at full speed for 2 hours?
Answer:
that jet will fly 1200 km in 2 hours
Oxygen is needed for the reactions that cause artifacts to decay in the ocean.
Some ancient shipwrecks have been well-preserved deep in the ocean.
Review the information in the data table. Which statement about the
relationship between rates of reaction and concentration of reactants is true?
Object
Location
Decay time
Average
concentration of
oxygen
Wooden ship
Deep ocean
Very low
1,000 years
Wooden rowboat Shallow beach
High
1 to 2 years
O A. Reactions are faster when there is a lower concentration of
reactants.
Answer: The answer is C.
Explanation:Just took the quiz
The statement about the relationship between rates of reaction and concentration of reactants true is reactions are slower when there is lower concentration of reactants.
What is chemical reaction?The chemical reaction is the reaction between two reactants which led to the formation of products.
The products are substances which forms after reaction. The reactants are the substances which are original materials.
Oxygen is needed for the reactions that cause artifacts to decay in the ocean.
Some ancient shipwrecks have been well-preserved deep in the ocean.
Reviewing the information in the data table, we conclude that reactions are slower when there is lower concentration of reactants.
Thus, the correct option is C.
Learn more about chemical reaction.
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