Can anyone help me with the two questions that is shown?
Answer:I can't see the question
Explanation:so i dont konw
what started that people thought the earth was flat
Answer:
The flat Earth model is an archaic conception of Earth's shape as a plane or disk. Many ancient cultures subscribed to a flat Earth and due to this people still belive earth is flat but scientist proven earth is round .
Explanation:
An old lorry is 20% efficient at converting the
chemical energy in the diesel into useful
mechanical energy. How many joules of
mechanical energy are produced when 600
joules of chemical energy have been used by
the engine?
Answer:
The amount of mechanical energy produced by the old lorry when 600 Joules of chemical energy have been used by the engine, M.E. is 120 Joules
Explanation:
The question is a word problem on the relationship between energy efficiency and energy consumption
The given parameters of the old lorry are;
The chemical energy to mechanical energy conversion efficiency of the old lorry = 20%
The amount of chemical energy used by the engine = 600 joules
Let 'M.E.' represent the amount of mechanical energy produced by the old lorry, we have;
[tex]Energy \ Efficiency = \dfrac{Energy \ produced }{Total \ Energy \ Taken \ In \ or \ Used} \times 100[/tex]
Therefore, the for the old lorry, we have;
[tex]20\% = \dfrac{M.E. \ Produced}{600 \ Joules} \times 100[/tex]
∴ M.E. Produced = 20/100 × 600 J = 120 J
The amount of mechanical energy produced by the old lorry when 600 Joules of chemical energy have been used by the engine, M.E. = 120 Joules
If the sun were to burn out, it would take humans just over 8 minutes to realize because light from the sun takes just over 8
minutes to reach earth. Tommy was 3 years old when his dad showed him a particular star that was estimated to be 18 light years
away from earth. If the star burned out immediately after Tommy was showed it, how old would Tommy be before he realized the
star was gone?
A)
21 years old
B)
18 years old
9 years old
D)
6 years old
the answer is (a. 21
Answer:the answer it’s A) I just took the test on USATestPrep
Explanation:
What skills are used to move the body from one place to another? *
Answer:
Walking, Running , Hopping, Jumping, Leaping
Explanation:
Because they made you move from one place to another
A vector quantity is : A deer running 15 meters per second due west
Answer:
True.
Explanation:
Velocity can be defined as the rate of change in displacement (distance) with time. Velocity is a vector quantity and as such it has both magnitude and direction.
Mathematically, velocity is given by the equation;
[tex]Velocity = \frac{distance}{time}[/tex]
Simply stated, a vector quantity has both magnitude and direction.
Thus, a vector quantity is: A deer running 15 meters per second due west.
If you walk up a set of steps empty handed and walk up the same set of steps holding a flower pot in thesame amount of time. Which requires more work?
a.) empty handed b.) holding flower pot c.) same
Explanation:
I think holding a flower pot. more energy will be needed
A cube has a volume of 583cm^3. What is the length of one side?
Answer:
shdkahfkkfrgs
Explanation:
:)
Describe the Geocentric Model of the our solar system.
Answer:
its basically our universe
Explanation:
:) hope this helps
An object is placed 2.5 cm away from a converging lens with a focal length of 1.5 cm
Answer:
The correct answer is "-1.5 cm".
Explanation:
The given values are:
Object is placed,
u = 2.5 cm
Focal length,
f = 1.5 cm
On applying the lens formula, we get
⇒ [tex]\frac{1}{u} +\frac{1}{v} =\frac{1}{f}[/tex]
or,
⇒ [tex]\frac{1}{v} =\frac{1}{u} -\frac{1}{f}[/tex]
On substituting the given values, we get
⇒ [tex]=\frac{1}{2.5} -\frac{1}{1.5}[/tex]
⇒ [tex]=\frac{1.5-2.5}{3.75}[/tex]
⇒ [tex]=\frac{-1}{3.75}[/tex]
⇒ [tex]v=-3.75 \ cm[/tex]
As we know,
Magnification, [tex]m=\frac{v}{u}[/tex]
On substituting the values, we get
⇒ [tex]=\frac{-3.75}{2.5}[/tex]
⇒ [tex]=-1.5 \ cm[/tex]
A 0.225 kg sample of tin initially at 97.5°c is dropped into 0.115 kg of water. the initial temperature of the water is 10.0°c. if the specific heat capacity of tin is 230 j/kg • °c, what is the final equilibrium temperature of the tin-water mixture
Answer:
The final equilibrium temperature of the tin-water mixture is approximately 18.468 °C
Explanation:
The parameters of heat energy transfer from the tin to the water are given as follows;
The mass of the sample of tin, m₁ = 0.225 kg
The initial temperature of the tin, T₁ = 97.5 °C
The mass of the water into which the tin is dropped, m₂ = 0.115 kg
The initial temperature of the water, T₂ = 10.0 °C
The specific heat capacity of tin, c₁ = 230 J/(kg·°C)
The specific heat capacity of water, c₂ = 4,200 J/(kg·°C)
Let 'T' represent the final equilibrium temperature of the tin-water mixture, we have;
The heat lost by the tin, ΔQ[tex]_{tin}[/tex] = The heat gained by the water ΔQ[tex]_{water}[/tex]
∴ ΔQ[tex]_{tin}[/tex] = ΔQ[tex]_{water}[/tex]
Where;
ΔQ[tex]_{tin}[/tex] = m₁·c₁·(T₁ - T)
ΔQ[tex]_{water}[/tex] = m₂·c₂·(T - T₂)
By substitution, we have;
ΔQ[tex]_{tin}[/tex] = 0.225 kg × 230 J/(kg·°C) × (97.5°C - T)
ΔQ[tex]_{water}[/tex] = 0.115 kg × 4,200 J/(kg·°C) × (T - 10.0°C)
From ΔQ[tex]_{tin}[/tex] = ΔQ[tex]_{water}[/tex], we have;
0.225 kg × 230 J/(kg·°C) × (97.5°C - T) = 0.115 kg × 4,200 J/(kg·°C) × (T - 10.0°C)
∴ 5,045.625 J - 51.75 J/°C × T = 483 J/°C × T - 4,830 J
5,045.625 J + 4,830 J = 534.75 J/°C × T
∴ 534.75 J/°C × T = 9,875.625 J
T = 9,875.625 J/(534.75 J/°C) = 18.4677419 °C ≈ 18.468 °C
The final equilibrium temperature of the tin-water mixture, T ≈ 18.468 °C.
Identify the medium an electromagnetic wave travels the fastest in.
empty space or vaccum the Electro magnetic wave travels the fastest.
Why do sex cells contain only half the number of chromosomes needed for offspring? Explain
Answer:
None, egg cells don't have chromosomes. No, sex cells do have chromosomes. Meiosis reduces chromosome number so that sex cells (eggs and sperm) have a half set of chromosomes–one homolog of each pair. This is the haploid number.
. Calculate the unbalanced force acting on a 0.50 kg toy rocket that accelerates at a constant rate with a velocity of 20 m/s (up) to 45 m/s (up) in 0.7 s.
Answer:
17.85N
Explanation:
Given data
m= 0.5kg
u= 20m/s
v= 45m/s
t= 0.7second
From
F= mΔv/t
substitute
F=0.5*(45-20)/0.7
F=0.5*25/0.7
F=12.5/0.7
F=17.85
Hence the force is 17.85N
Can someone explain E=mc2
In FULL detail please
Einstein's Big Idea homepage. E = mc2. It's the world's most famous equation, but what does it really mean? "Energy equals mass times the speed of light squared." On the most basic level, the equation says that energy and mass (matter) are interchangeable; they are different forms of the same thing.
A fixed source charge particle of 4.1 nC and a second particle with a charge 2.4 nC are separated by a distance of 3.5 cm. What is the electric potential energy between the particles? And if the second particle is released will it move forward or away from the source charge
Answer:
a. 2.53 μJ b. It will move away
Explanation:
a. What is the electric potential energy between the particles?
The electric potential energy U = kq₁q₂/r where k = 9 × 10⁹ Nm²/C², q₁ = 4.1 nC = 4.1 × 10⁻⁹ C, q₂ = 2.4 nC = 2.4 × 10⁻⁹ C and r = distance between charges = 3.5 cm = 3.5 × 10⁻² m.
Substituting the values of the variables into U, we have
U = kq₁q₂/r²
U = 9 × 10⁹ Nm²/C² × 4.1 × 10⁻⁹ C × 2.4 × 10⁻⁹ C/3.5 × 10⁻² m
U = 88.56 × 10⁻⁹ Nm²/3.5 × 10⁻² m
U = 25.3 × 10⁻⁷ Nm
U = 2.53 × 10⁻⁶ Nm
U = 2.53 × 10⁻⁶ J
U = 2.53 μJ
b. And if the second particle is released will it move forward or away from the source charge.
It will move away from the source charge since they have the same sign of charge. Since, opposite charges repel.
Answer:2.5 * 10^6 J away
Explanation:Using the equation PE = 9 * 10^9 * q1 * q2 / r,
where q is charge and r is distance. In this case, the equation would be
9*10^9{(4.1* 10^-9) * (2.4*10^9)/0.035} = 2.5 * 10^6. Both are positive, so they will be away.
A 10 N force and a 55 N force act on an object in opposite directions. What is the net force on the object ?
Answer:
对不起，我不知道对不起
Explenation:
The net force acting on the body is 45 N
Force is a vector, vectors are quantities that have both magnitude and direction. We must take the direction of the vector into account when computing the net force.
Since the two forces act in opposite directions, the net force is; 55 N - 10 N = 45 N.
The direction of this force is towards the 55 N force which is the larger force.
Learn more: https://brainly.com/question/14685564
what's the dif between radio waves and infrared waves
Answer:
The Difference between Radio Waves and Infrared Light. According to NASA, radio waves have a longer wavelength than infrared light, in the electromagnetic spectrum. Radio waves are able to reach the earth’s surface, unlike most infrared light.
Explanation:
I hope this helps.
help pls !!! Which statement is true for nuclear reactions but not for chemical reactions?
Answer:
D
Explanation: this is why they have so much more energy released
During nuclear reactions, there is a loss in mass as some mass of the atoms involved is converted to energy.
What are nuclear reactions?Nuclear reactions are reactions which involves changes in the nucleus of of atoms of elements.
Nuclear reactions release a large amount of energy far greater than in chemical reactions.
Nuclear reactions are of two types:
Nuclear fusion, andNuclear fissionDuring nuclear reactions, there is a loss in total mass of the particles as some of the mass is converted to energy.
Therefore, in nuclear reactions, some mass of the atoms involved us converted to energy.
Learn more about nuclear reactions at: https://brainly.com/question/984564
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What is one way homeostasis benefits living organisms?
it maintains balance.
It reduces air pollution.
It increases food consumption
It regulates atmospheric temperature
Answer:
it maintains balance, it keeps body temperatures , heart rate and all other bodily functions regulated to keep the organism stable when the environment is not.
Answer:
What the other guy said.
Explanation:
Yeah I'm doing this so he can have brainliest.
What is the velocity of a ball that is thrown in the air 16 meters? The ball reaches the ground in 25 seconds
v = d/t
please be quick
Answer:
0.64
Explanation:
v = d/t
v= 16/25
v= 0.64
Calculate by how much a spring with spring constant 1.2N/m has been squashed when it has stored 76J,
Answer:
11.25 m
Explanation:
From the question given above, the following data were obtained:
Spring constant (K) = 1.2 N/m
Energy (E) = 76 J
Compression (e) =?
Energy stored in a spring is given by the following equation:
E = ½Ke²
Where:
E => Energy stored in the spring.
K => spring constant
e => Extention or compression
With the above formula, we can obtain how much the spring has been squashed as follow:
Spring constant (K) = 1.2 N/m
Energy (E) = 76 J
Compression (e) =?
E = ½Ke²
76 = ½ × 1.2 × e²
76 = 0.6 × e²
Divide both side by 0.6
e² = 76 / 0.6
Take the square root of both side.
e = √(76 / 0.6)
e = 11.25 m
Thus, the spring has been squashed by 11.25 m
What is the gravitational force between the Earth and the Sun? The mass of the Earth is 5.972 x 1024 kg, the mass of the Sun is 1.99 x 1030 kg, and the
distance between the Earth and the Sun is 1.496 x 101 m.
5.295 x 1033N
9881N
O 3.54 x 1022N
5.11 x 1014 N
As an astronaut travel far away from earth her weight
Explanation:
As an astronaut travel far away from the earth her weight Decreases because weight depends upon the acceleration due to gravity and in space there is no gravity.
1. Identify a region in the USA that is likely to be a large producer of natural gas.
Answer:
The top producing states are Texas, Oklahoma, New Mexico, Wyoming, and Louisiana, which produce more than 50 percent of U.S. natural gas
The top states in USA that is likely to be a large producer of natural gas is Texas. The 24 .6 % of the overall production of natural gas is in Texas.
What is natural gas ?Natural gas is a type of fossil fuels. It is highly flammable hydrocarbon primarily consists of methane gas. In 2016, natural gas accounted for 33 percent of all energy produced in the US, making it the greatest energy source in the nation.
Since July 2015, natural gas has become the main fuel used to generate electricity in the US. With an average wellhead value of $2.66 per thousand cubic feet and a total wellhead value of $67.3 billion, the United States produced 25.3 trillion cubic feet of marketed natural gas in 2012.
The top 5 natural gas producing states in US are Texas, Pennsylvania, Louisiana, West Virginia, Oklahoma. In which the top one is Texas.
Find more on natural gas:
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find the answer pls
Answer:
1y hija de la granja de la granja de la granja de la
what is the difference between a girl chromosome and a boy chromosomes?
Explanation:
Girls have two X Chromosomes while boys have one X Chromosome and, as you now know, one Y Chromosome. So girls are XX and boys are XY.
Answer: The X and Y chromosomes, also known as the sex chromosomes, determine the biological sex of an individual: females inherit an X chromosome from the father for a XX genotype, while males inherit a Y chromosome from the father for a XY genotype (mothers only pass on X chromosomes).
Explanation:
Big sound is heard in bathroom than in a living room
Answer
That doesn't make any sense.
Explanation:
Which term, when divided by volume, equals density?
A) Distance
B) Power
C) Mass
D) Weight
Answer:
C) Mass
Explanation:
The mass of an object divided by its volume equals the density.
Hope this helps!
The term when divided by volume, equals density is known as Mass. Thus, the correct option for this question is C.
What is Density?Density may be defined as a type of physical property that significantly deals with the description of how much space an object or substance takes up with respect to the amount of matter in that object or substance.
In a more simple sense, it is characterized as the measurement of quantity or mass per unit of volume in a particular substance.
The formula for calculating the density is as follows:
Density = Mass/Volume.Therefore, the term when divided by volume equals density is known as Mass. Thus, the correct option for this question is C.
To learn more about Density, refer to the link:
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What statement below is true about Mercury?
A)
On Mercury you weigh only 70% of what you weigh on Earth
B)
On Mercury you weigh only 38% of what you weigh on Earth
On Mercury you weigh only 90% of what you weigh on Earth
D)
On Mercury you weigh only 10% of what you weigh on Earth
Answer: It is B 38% have a good day :DDD