Answer: Advantages of following the soft path, the argument here is alternative sources of power such as hydropower, geothermal energy , wind energy , and photovoltaic cells must be developed. This provides a alternative source to remain in a healthy environment and also function as the society we currently live in using the hard path. Disadvantages of following the hard path result with future generations fearing over the irreversible damage of climate change and the damage done to our atmosphere. The hard path argue that we should continue to operate in the future as we have in the past, except more efficiently. This is close to impossible and will only continue the negative effects the hard path( the path we have been following) results in. The major shift determines the outcome of this world, the futures worries or reliefs and ultimately the survival of humans.
The speed of a 120 meter long train is 54 km per hour. it crosses a bridge in 32 seconds.
1. determine the length of the bridge in kilometer.
2. determine the speed of the train in kilometer per hour to cross the bridge in 24 seconds.
3. determine the length of the train when the speed of the train is 54 km per hour and it cross the bridge in 36 seconds.
1. The length of the bridge is 360 m.
2. The speed of train in km/hr to cross the bridge in 24 s is 72 km/hr.
3. The length of the train when it cross the bridge in 36 seconds is 540 m.
What is speed?
Speed is the ratio of distance traveled and the time taken to cover that distance.
1.
The speed of train m/s is 54 x 5/18 = 15 m/s
The train crosses the bridge in 32 s, distance traveled by train will be
=32 x 15 =480m
The length of the bridge = (480 -120) =360 m
Thus, the length of the bridge is 360 m.
2.
Speed of train in m/s to cross the bridge in 24 s
= 480/24 = 20 m/s
Speed in km/hr =20 x 18/5 = 72 km/hr
Thus, Speed of train in km/hr to cross the bridge in 24 s is 72 km/hr.
3.
Speed of train in m/s =15 m/s
Train crosses the bridge in 36 s, then length of train will be
= 15 x 36m = 540m
Thus, the length of the train when it cross the bridge in 36 seconds is 540 m
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Does the efficiency of a motor depend on mass?
Practically yes
Efficiency=Output/inputSo
If mass is more output may come less so it affects the efficiency practically
But thepritically it doesn't
Answer:
Yes
Explanation:
Formula of motor efficiency
η = Input Load (E₀)/ Output Load(E₁)We know from simple physics that the energy of a body is directly proportional to its mass. Here, in the working of a motor, mass may not be involved directly, but the electrical energy required to provide a function will likely have more efficiency when working with lesser masses.
what evidence is there suggesting ellipticals may form from the mergers of 2 or more spiral galaxies
Elliptical galaxies could be formed by the collision and merging of two spiral galaxies.
What is galaxy?Galaxy is the huge collection of stars, interstellar gases, dust particles, stones. Galaxies tend to come in two shapes such as spirals and ellipticals.
In spiral galaxies, the stars orbit in a very thin disk, and all the stars move in the same direction. Two or more spiral arms wind around the center just like a pinwheel.
Selecting a sample of about 50 spiral galaxies that have collided and in the process of merging into a single object. We took infrared images using the UH 88-inch (2.2-meter) telescope, and obtained spectra of these mergers using one of the Keck telescopes.
Infrared images are used to see, if the starlight in these objects decreases with distance from the center of the galaxy the way it does in spirals or the way it does in ellipticals. The light intensity decreases exponentially in outward direction from the centers of spirals, but it declines much more slowly with distance from the center for ellipticals. It is found that at least 45 out of 51 mergers are ellipticals.
Thus, most of these mergers really are evolving into elliptical galaxies.
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It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then...
Select one:
a. the pulley rope is pulled 1 meter.
b. the pulley rope is pulled more than 1 meter, but less than 3 meters.
c. the pulley rope is pulled 3 meters.
d. the pulley rope is pulled more than 3 meters.
Answer:
b
Explanation:
It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then the pulley rope is pulled more than 1 meter, but less than 3 meters.
It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then. The correct answer is a. the pulley rope is pulled 1 meter.
When lifting a piano using a pulley system, the distance the pulley rope is pulled will be the same as the distance the piano is lifted. This is due to the mechanical advantage of the pulley, which reduces the amount of effort needed to lift the piano but does not change the distance the rope is pulled.
In a simple single fixed pulley system, where one end of the rope is attached to a fixed point and the other end is used to lift the piano, the distance the pulley rope is pulled will indeed be the same as the distance the piano is lifted.
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A student measured the length of a wire four times using a meter rule and obtained the following readings: 18.6cm, 18.5cm 18.6cm and 18.5cm. Determine the length the student should record.
The length the student should record as correct is 18.55 centimeters (cm) because it is the average value.
What is the average value?The average value is a number associated with the middle amount for a given number of measured samples.
In this case, the median value results less useful to describe a set of data when compared to the average.
In conclusion, the length the student should record as correct is 18.55 centimeters (cm) because it is the average value.
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Voyager 1 and 2 sent back detailed information about all of the following except:
a.
the characteristics of all outer planets in our solar system
b.
the nature of our cosmic neighborhood at the edge of our galaxy
c.
details about saturn and jupiter
d.
components that make up our asteroid belt between mars and jupiter
Answer:
D
Explanation:
Components that make up our asteroid belt between mars and jupiter
Explain how the wave behave as the Frequency changes using the characteristic described in
Let's find the relationship
[tex]\\ \rm\Rrightarrow E=h\nu[/tex]
[tex]\\ \rm\Rrightarrow \lambda=\dfrac{c}{\nu}[/tex]
So if frequency increases Energy of the wave increases and wavelength decreases and vice-versaA monochromatic beam of light is absorbed by a collection of ground-state hydrogen atoms in such a way that three different wavelengths are observed when the hydrogen relaxes back to the ground state.
Answer:
If the absorbed beam is monochromatic (one wavelength) then it excites the H atom to some state n.
When that state decays, some of the atoms may decay to state 1, others to state 2, and still others to state 3
The net energy emitted in such a case would depend on:
n -1, n - 2, n - 3 which would produce 3 different wavelengths
Does this equation show that transmutation has taken place during decay?
Why or why not?
6128 Ni -> 6128 Ni + y
A. Yes, because the numbers of nucleons and atoms are conserved.
B. No, because there is conservation of the number of atoms as well as the number of nucleons.
C. Yes, because the nickel atoms remain nickel atoms with the same number of neutrons.
D. No, because high-energy electromagnetic waves are emitted.
Explanation:
Transmutation means change in neutron numbers u
Like for example
When Potassium (N=19 ) goes through beta decay it forms (N=20)
Here no change in neutrons (Same 28)
So no trnasmutaions.
Option B
The atomic number of an element whose atoms have 12 protons and 10 neutrons is
Describe the electric and magnetic fields of an electromagnetic wave.
A 0.400-kg block of iron is heated from 295 oK to 325 oK. How much heat had to transfered to the iron?
The quantity of heat that was transferred to the block of iron is 5544 J or 5.544 kJ
Quantity of HeatFrom the question, we are to determine how much heat was transferred to the block of iron
Using the formula,
Q = mcΔT
Where Q is the quantity of heat
m is the mass
c is the specific heat capacity of the substance
and ΔT is the change in temperature
From the given information,
m = 0.400 kg
ΔT = 325 - 295 = 30 K
Putting the parameters into the equation, we get
Q = 0.400 × 462 × 30
(NOTE: Specific heat capacity of iron = 462 J/kg.K)
∴ Q = 5544 J
Hence, the quantity of heat that was transferred to the block of iron is 5544 J or 5.544 kJ
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A 1200 kg car moving at 2.5 m/s is struck in the rear by a 2600 kg truck moving at 6.2 m/s. If the vehicles stick together after the collision, what is their speed immediately after colliding?
Velocity: m/s
Answer: 5.0 m/s
Explanation:i had this question on my test
100 % verified!
Conservation of linear momentum
[tex]\\ \rm\Rrightarrow m1v1+m2v2=(m1+M2)v3[/tex]
[tex]\\ \rm\Rrightarrow 1200(2.5)+2600(6.2)=(1200+2600)V3[/tex]
[tex]\\ \rm\Rrightarrow 3000+16120=3800v3[/tex]
[tex]\\ \rm\Rrightarrow 19120=3800v3[/tex]
[tex]\\ \rm\Rrightarrow V3=5m/s[/tex](Approx)
A length of wire is cut into 3 equal pieces. if each piece has a resistance of 0.20 , what is the resistance of the original length of wire?
Answer:
0.6
Explanation:
the original wire is three times the length there fore the longer the wire the more resistance
therefore the resistance of the original wire is 3 times greater making it 0.6
A nuclear power plant is built alongside a river. what measurements should a monitoring station downstream record to be sure that the proper procedures are being followed at the power plant? density and radiation levels radiation levels and dust levels salt concentration and temperature temperature and radiation levels
Nuclear power plant should have monitoring units and water purifiers units, so thet they followed propress in the plant.
What is nuclear power plant?
Nuclear power plant is a structure that allows the generation of energy from the fission of toxic materials. It is usually due to the risk of accidents. Nuclear energy is very important for the generation of electricity in many countries.
Hence, water purifiers units should be used in the downstream to measure to protect river should be taken.
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Answer:
temperature and radiation levels
Explanation:
edge
what will be the change in momentum caused by a net force of 240 N acting on an object for 3 seconds ?
Given the value of force applied in the given duration of time, the impulse or change in momentum caused by the net force is 720kgm/s.
What is Impulse?An impulse is simply a concept that involves the change in the momentum of an object when force is introduced for a period of time.
It is expressed as;
ΔP or Change in Momentum = F × t
Where F is force applied and t is the elapsed time.
Given the data in the question;
Force applied F = 240N = 240kgm/s²Time elapsed t = 3sImpulse ΔP = ?ΔP = F × t
ΔP = 240kgm/s² × 3s
ΔP = 720kgm/s
Given the value of force applied in the given duration of time, the impulse or change in momentum caused by the net force is 720kgm/s.
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Find the markdown price. Shelly Ward purchased a mountain bike for 35 percent off the regular price of $899. how much is the markdown?
The markdown price for a mountain bike is $584.35
What is markdown price?Markdown price is the discount offered by the shopkeepers to the customers to increase the sales rate.
M.P = S.P (1-r/100)
The following expression can be used every time we have to find the markdown price.
Substitute Selling price S.P =$899 and the percent r =35/100 =0.35, we get
M.P = $899(1-0.35)
M.P =$584.35
Thus, the markdown price is $584.35
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how to convert 54km.h to m.s
Answer:
15m/s[tex] \: [/tex]
Explanation:
Before converting , Let's recall this :
1 km = 1000 metres1 hour = 3600 seconds[tex] \: [/tex]
Now, Let's Convert it :
[tex] \\ \longrightarrow \qquad \sf \: 54km / hr \\ [/tex]
[tex]\\ \longrightarrow \qquad \sf \: \frac{54 \times 1km}{1hr} \\ [/tex]
[tex]\\ \longrightarrow \qquad \sf \: \frac{54 \times 1000m}{3600s} \\ [/tex]
[tex]\\ \longrightarrow \qquad \sf \: \frac{54000 m}{3600s} \\ [/tex]
[tex]\\ \longrightarrow \qquad \sf \: \frac{540\cancel{0 }\cancel{0} m}{36 \cancel{0 }\cancel{0}s} \\ [/tex]
[tex]\\ \longrightarrow \qquad \sf \: \frac{540 m}{36s} \\ [/tex]
[tex] \\ \longrightarrow \qquad \frak{\pmb{ 15m /s}} \\ [/tex]
Why is it important to be careful interpreting absolute ages of clastic sedimentary rocks such as sandstones?
Answer:
You need to be careful when finding the true age of sedimentary rocks to understand its full history.
Explanation:
Describe the electric and magnetic fields of an electromagnetic wave.
Answer:The electric field and magnetic field of an electromagnetic wave are perpendicular (at right angles) to each other. They are also perpendicular to the direction of the EM wave. EM waves travel with a constant velocity of 3.00 x 108 ms-1 in vacuum.
Explanation:
Let each shake of the pennies or thumbtacks represent 1 year. what is the half life, in years, for the pennies in experiment 1? what is the half-life, in years, for the thumbtacks in experiment 2?
(5.4.3 lab - nuclear physics)
The half-life of the pennies in experiment 1 and 2 will be the time it takes for half the pennies to fall off after shaking.
What is Half-Life?Half-Life is the time required for half the amount one a given substance to disappear or decay.
The half-lives of substances are usually constant values.
For example, the Half-Life of radioactive carbon-14 is 5700 years.
Therefore, the half-life of the pennies in experiment one and two will be the time it takes for half the pennies to fall off after shaking.
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Calculate the molar mass of sucrose:
Answer:
342 g/mole
Explanation:
Mass of the carbon = 12 g
Mass of the hydrogen = 1 g
Mass of the oxygen = 16 g
Given: Chemical Formula of the Sucrose = C12H22O11
Molar mass = 12 x 12 + 1 x 22 + 16 x 11
= 144 + 22 + 176
= 320 + 22
= 342 g/mole ➪ molar mass of the sucrose
342 g.
Explanation:
C12H22O11 ------> SugarCarbon has mass -> 12
Hydrogen has mass -> 1
Oxygen has mass -> 16
=> (12× 12 ) + (1 ×22 ) + ( 16 × 11 )
=> 144 + 22 + 176
=> 342 gram
__________________Molecular mass : The Molecular mass of a substance is the sum of the atomic masses of all atoms in a molecule of a substance, e.g ., Molecular mass of water is 18u.H2O = 2 × H + 1 × O=> 2 × 1 + 1 ×16 = 2+16= 18 u. Mass of one mole of a substance is called its molar mass. ___________________what is a Molecule?
A Molecule is the smallest Particle of an element or a compound capable of independent existence under ordinary conditions. It shows all the properties of tge substance.When cell a sends a message to
cell b, ? occurs at cell
b.
a. osmosis
b. active transport
c. synaptic transmission
Answer:
c. Synaptic transmission
Explanation:
To transmit impulses/electronic signals around the body, nerve cells transfer messages across the synapse and the movement of the chemicals from one cell to the other is known as either diffusion or synaptic transmission.
Can you help me I’m struggling?
Marjorie drops an object from a height of h meters, and it hits the ground with a velocity of v m/s, as given by the function v equals the square root of 19.6 h. If the velocity of the object is 68.6 m/s, what was the height of the object before it was dropped? Round your answer to the nearest tenth.
Answer:
240.1 m
Explanation:
Potential energy ( mgh) is fully converted to Kintetic energy ( 1/2 mv^2)
equate them
mgh = 1/2 mv^2 divide by 'm'
gh = 1/2 v^2
9.8 h = 1/2 v^2
19.6 h = v^2 v = sqrt ( 19.6h) (as given)
68.6 = sqrt (19.6 h) solve for h = 240.1 m
If the volume of a container increases what
effect will this have on pressure? Why?
As the volume of the container increases the pressure inside will decrease because the atoms have more room to move around in.
Answer:
In a container of the same volume, a greater number of molecules results in greater pressure. Gas pressure increases as container volume decreases.
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Thankyou for joining Brainly Communicty!!How much force is required to accelerate a 12kg mass at 10m/s/s
Answer:
100N
Explanation:
The tape timer used in this experiment marks the paper tape with dots at fixed time intervals. How does it do that?.
The ticker tape is pulled through the timer once it's powered, which creates a dot along the length of this paper tape at fixed time intervals.
What is a ticker timer?A ticker timer can be defined as a scientific apparatus that is designed and developed to measure time in seconds. Thus, a ticker timer can be used to measure short intervals of time by making dots on a paper tape at regular (fixed) intervals.
By design, a ticker timer comprises a magnet, carbon paper disk and a ticker tape which is pulled through the timer once it's powered, so as to create a dot along the length of this paper tape at fixed time intervals.
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How hot must a star get before it becomes a star?
Answer: 10 million degrees
Explanation:
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Why do we feel the force of gravity from the Earth but we don’t feel the force of gravity from the moon?
Answer:
The gravitational force on the moon is less than on Earth because the strength of gravity is determined by an object's mass. The bigger the object, the bigger the gravitational force. Gravity is pretty much everywhere. We just feel it in different ways depending on our state of motion.
Explanation:
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