Answers
Related Questions
Which two statements best explains how observations of the spectra of light from galaxies are used to support current theories of the origin and evolution of the universe?
A: Galaxies that are further away tend to have larger redshifts
B: the blueshift observed from distant galaxies indicate that galaxies remain stationary relative to earth
C: the redshift observed from nearby galaxies indicates that most galaxies remain stationary relative to earth
D: the blueshift observed from nearby galaxies indicates that the solar system is orbiting a black hole
E: the redshift observed from distant galaxies indicates that they are moving away faster than nearby galaxies
Answers
The temperature inside a Carnot refrigerator placed in a kitchen at 22 degree Celcius is 2 degree Celcius. The heat extracted from the refrigerator is 89 MJ/h. What power is needed to operate this refrigerator?
Answers
Answer: 1.79 kW
Explanation:
Given
The temperature of the refrigerator is [tex]T_L=2^{\circ}C\approx 275\ K[/tex]
The temperature of the kitchen is [tex]T_H=22^{\circ}C[/tex]
COP of the refrigerator is
[tex]COP=\dfrac{T_L}{T_H-T_L}=\dfrac{\text{Desired effect}}{\text{Power}}\\\\\Rightarrow COP=\dfrac{275}{22-2}=\dfrac{89}{P}\\\\\Rightarrow P=\dfrac{20}{275}\times 89=6.47\ MJ/h\ \text{or}\ 1.79\ kW[/tex]
Someone help me & extra pointsss!
Answers
Answer:
117.43 m
Explanation:
Eg=mgh=13x9.81xh=127.53h(N)
Ek=0.5mv^2=0.5(13)(48)^2=14,976 N
by conservation of potenial energy:
Ei=Ef
127.53h=14976
h=117.43m
Even though we have managed to vastly improve on flight since the early 1900's, engineers still work to
improve upon air travel. One of the best ways to engineer a new design for a particular product would be
to
Answers
Answer:
C. for sure
Explanation:
usatestprep
A sound wave travels from air into a swimming pool. How does its speed
change?
Answers
Answer:
It is b
Explanation:
What is the frequency of a light with the wavelength of 5.00 x 102 m?
Answers
Answer:
510 meters
Explanation:
That is sort of a math question but with the meters and wavelength, it's both a physical and a math question. Don't worry, i won't report (Unless you report my answer)
A 0.40 kg soccer ball has 20 J of kinetic energy. How fast is it moving?
Answers
1/2 x 0,40 x v^2 = 20J
v^2 = 20/0,5x0,4
v^2 = 100
v = 10
it is moving at 10 m/s
PLEASE HELP!! THIS IS DUE TODAY!
explain how the path of light changes as it moves from the oil to the water
Answers
what is required to cause a body of mass 500g to accelerate uniformly from rest across a smooth horizontal surface so that it will cover a distance of 20 tometre in 4 seconds .
Answers
A constant force of 1.25N
Explanation:
This is a kinematics problem.
First find acceleration,
then use F = ma to find force.
Given:
mass = .5kg
delta x = 20m
t = 4s
a = ?
Friction = 0
From the kinematics equations:
delta x = Vi + (1/2)at^2
Plug in terms that are given:
20m = 0 + (1/2)a(4^2)
(2*20m)/(16s^2) = a
40m/(16s^2)= 2.5m/s^2
Now use F = ma to find force exerted on object.
F = (0.5kg)*(2.5m/s^2)
F = 1.25N
What might you be doing if you measure your heart rate and find that it beats 100 times in a minute?
Answers
Answer:
Rigorous exercise
Explanation:
For your heart rate is been around 100 bpm you should be doing a rigorous exercise . but if ain't doing any rigorous exercise and your heart rate is constantly above 100 bpm you should consult your doctor.
An average heart is between 60 bpm to 100 bpm.
A submarine dives at an angle of 30.0o with the horizontal and follows a straight-line path for a total distance of 50.0 m. What distance is the submarine below the surface of the water?
Answers
Answer:
25 m
Explanation:
The submarine dives at angle of 30 degree with the horizontal . It has travelled 50 m at this angle . So , it will have both 25 horizontal as well as vertical displacement below the surface .
vertical displacement below the surface = vertical component of displacement of 50 m
= 50 sin30
= 25 m .
Depth of submarine below the surface = 25 m.
Why do Tectonic Plates move?
A) convection currents in the atmosphere
B) convection currents in the crust
C) convection currents in the asthenosphere
D) Convection currents in the core
Answers
Answer:
c. convection currents in the asthenosphere
Explanation:
Which statement compares the attractive forces that hold particles together?
A. Covalent bonding and Van der Waals forces join separate
molecules together, while ionic and hydrogen bonding produce
compounds.
B. Covalent and hydrogen bonding produce compounds, while ionic
bonding and Van der Waals forces join separate molecules
together.
C. lonic and covalent bonding produce compounds, while hydrogen
bonding and Van der Waals forces join separate molecules
together.
D. Ionic and covalent bonding join separate molecules together, while
hydrogen bonding and Van der Waals forces produce compounds.
Answers
Answer:
Ionic and covalent bonding produce compounds, while hydrogen bonding and Van der Waals forces join separate molecules together.
Ur welcome:)
Answer:
C) lonic and covalent bonding produce compounds, while hydrogen bonding and Van der Waals forces join separate molecules together.
Explanation:
William drew a diagram of a box containing a gas for his science project. His drawing is shown.
Answers
Please help me and get 15 points and Brainlessly!!!!!!!
Bauxite is the chief ore from which aluminum is extracted. Which of these statements is correct about bauxite? (15 points)
Group of answer choices
It has a definite crystal structure.
It does not have a definite chemical composition.
Its atoms do not arrange themselves in a definite order.
Its molecules are made up of a different number of atoms.
Answers
Answer:
A
Explanation:
Bauxite is the primary mineral from which aluminum is produced. The ore must first be cleaned before the metal can be electrolytically reduced out of it. Thus, option A is correct.
What Bauxite is the chief ore from which aluminum?Bauxite normally has a Mohs hardness of 1 to 3 and is a soft substance. Its color ranges from white to gray to reddish-brown and has a pisolitic structure. It also has an earthy gloss and a specific gravity of 2.0 to 2.5. These characteristics help distinguish bauxite, although they have no bearing on its worth or potential uses.
Typically, aluminum is manufactured in regions with relatively low electricity costs. An abrasive substance is bauxite.
Therefore, Bauxite is crushed to a fine powder and then fused at a very high temperature to form spherical beads, creating sintered bauxite, which is frequently used as a sand-blasting abrasive.
Learn more about Bauxite here:
https://brainly.com/question/4372634
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Which formula represents the law of conservation of energy?
Answers
Answer:
KE+PE
Explanation:
If a car accelerates from rest at a constant 4 m/s
, how long will it take for the car to reach a
velocity of 28 m/s?
Answers
Answer:
Time, t = 7 seconds.
Explanation:
Given the following data;
Initial velocity = 0m/s (since it is starting from rest).
Acceleration, a = 4 m/s²
Final velocity, v = 28 m/s
To find the time, we would use the first equation of motion given by the formula;
V = u + at
Substituting into the formula, we have;
28 = 0 + 4*t
28 = 4t
Time, t = 28/4
Time, t = 7 seconds.
If the maximum moment of force on a door is 10 Nm by an applied force of 2.25 N, then the distance of handle
Answers
Answer:
d = 4.44 m
Explanation:
Given that,
The moment of force on a door = 10 N-m
The applied force, F = 2.25 N
We need to find the distance of the handle. The moment of force is given by :
[tex]\tau=F\times r[/tex]
Where
r is the distance of the handle.
[tex]r=\dfrac{\tau}{F}\\\\r=\dfrac{10}{2.25}\\\\r=4.44\ m[/tex]
So, the required distance is equal to 4.44 m.
A student is sitting in a chair and not moving, however, there are forces acting on her. What must be trust about the forces acting on the student?
Answers
Answer: It is trusted that the sum of all forces acting on the student, adds up to zero the student is not moving.
Explanation: the plane they give you that the plane is moving at a constant velocity of 250 m/s this means that the acceleration is zero, we substituted in the formula F=ma which will give us the Force. And knowing that its constant speed, forward force is then equal to the Air resistance. Hence we find the Air resistance force
i need help with this question really urgent
Answers
Answer:
Cost Per Hour:
132.0000
Cost Per Day:
39600.0000
Cost Per Month:
1204632.00
Cost Per Year:
14455584.00
kWh Per Day:
3600.00
Mercury is a very small planet, with a surface that is exposed directly to space. This is because the planet has practically no
atmosphere. Normally, no atmosphere would mean very cold, but it is very hot on Mercury. Why?
Answers
The surface of Mercury looks much like Earth's moon. ... On its dark side, Mercury gets very cold because it has almost no atmosphere to hold in heat and keep the surface warm. The temperature can drop down to minus 300 degrees Fahrenheit. Sunlight never reaches into the bottoms of some craters near Mercury's poles.
Answer: B
Because Mercury is the closest planet to the sun
Explanation:
Hope this helps
Which of the following statements about Australian football is TRUE?
A.
The players tend to wear a large amount of padding.
B.
Goals are scored by kicking the ball through goalposts.
C.
Each team has a number of set plays for both offense and defense.
D.
The constant movement of the ball is similar to baseball.
Answers
Answer:
B.
Goals are scored by kicking the ball through goalposts.
Explanation:
what does point c represent
Answers
Explanation:
point c is minimum Amplitude in transversal wave
number of atoms of each element potassium chlorate?
Answers
How does the total mass before a nuclear reaction compare with the total mass after
a nuclear reaction? How does Einstein's equation address this difference?
Answers
Una reacción química, también llamada cambio químico o fenómeno químico, es todo proceso termodinámico en el cual dos o más especies químicas o sustancias (llamadas reactantes o reactivos), se transforman, cambiando su estructura molecular y sus enlaces, en otras sustancias llamadas productos.
Answer: A chemical reaction, also called chemical change or chemical phenomenon, is any thermodynamic process in which two or more chemical species or substances (called reactants or reactants), are transformed, changing their molecular structure and their bonds, into other substances called products.
Explanation:
Four satellites are in orbit around the Earth. The heights and the masses of
the four satellites are given in the table. For which satellite is the gravitational
pull of Earth the strongest?F= Gm1m2/r^2
A. Satellite A
B. Satellite B
C. Satellite C
D. Satellite D
Answers
Answer:
satellite B
Explanation:
A .F= G (mM)/r²
B .F= G (2mM)/r² = 2G (Mm)r²
C .F= G (3mM)/(2r)² = ¾G (mM)/r²
D .F= G (4mM)/(2r)² = G (mM)/r²
the unit of force is the
backhaus
Einstein
newton
kilogram
Answers
Answer:
the answer is a C a newton
(b) The difference h between the two liquid levels is 2.0 cm. The density of the
liquid is 800 kg /m3.
Calculate the difference between the pressure of the gas and atmospheric
pressure.
.[2]
pressure difference
Answers
Answer:
101201.2 Pascal.
Explanation:
Given that the difference h between the two liquid levels is 2.0 cm. The density of the liquid is 800 kg /m3.
Calculate the difference between the pressure of the gas and atmospheric
pressure.
The pressure of the gas can be calculated by using the formula
Pressure = density × acceleration due to gravity × height
Substitute all the parameters into the formula
Pressure = 800 × 2/100 × 9.8
Note that the height is converted to metre.
Pressure = 156.8 Pascal
pressure difference = 101358 - 156.8
Pressure difference = 101201.2 Pascal
A 75.0 kg driver slides into a seat in a truck that has only 1 spring. The spring compresses 1.60 cm = 0.0160 m. What is the spring constant of the spring in the seat?
Answers
Answer
0.510
Explanation:
What kind of energy involves the flow of positive charges?
thermal
radiant
electrical
nuclear
Answers
Electrical would be the energy that involves the flow of positive changes
Answer:
Electrical
Explanation:
Electrical would be the energy that involves the flow of positive charges.