Answer:
10 hours earlier than regular train
Explanation:
In this case you are already giving the expression to be used which is:
S = D/t (1)
The problem is giving us the data of the speed of both trains, and we also know the distance between City A and B, which is 4000 km, therefore, we just need to solve for t in the above expression for both trains, and then, do the difference between their times and see how much earlier the express train arrives.
Solving for t, we have:
t = D/S (2)
For Train 1 (The regular):
t₁ = 4000 / 80
t₁ = 50 h
For Train 2 (Express):
t₂ = 4000 / 100
t₂ = 40 h
Now, as expected express train arrives earlier, now let's see how much:
T = t₁ - t₂
T = 50 - 40
T = 10 hTherefore, Express train arrives 10 hours earlier than regular train.
Hope this helps
Device that transforms thermal energy to mechanical energy
Answer:
the device that transfer thermal energy into to mechanical energy is heat engine.
hope it helps.
Explanation:
heat engine transforms thermal energy to mechanical energy
hope it is helpful to you
An ice cube is put into a heated pan. What will most likely happen to the molecules in the ice as the ice is heated
1. the molecules will begin to move slower
2.the molecules will begin to move faster
3. the molecules will begin to increase in density
4. the molecules will begin to condense in the air
Answer:
2 the molecules will move faster
Explanation:
the heat from the pay gives the molecules now energy causing the to spread out and move faster
A bottle of water with mass 0.9 kg is left out in the sun, the radiation from the sun warms up the water bottle. If the water bottle was initially 10°C and the sun provided 120,000 J of thermal energy, calculate the final temperature of the water. Use C = 4182 j/kgK for the specific heat of water.
Answer:
Final temperature, T2 = 314.9 Kelvin
Explanation:
Given the following data:
Mass = 0.9kg
Initial temperature, T1 = 10°C to Kelvin = 10 + 273 = 283K
Quantity of heat = 120,000 J
Specific heat capacity = 4182 j/kgK
To find the final temperature;
Heat capacity is given by the formula;
[tex] Q = mcdt[/tex]
Where;
Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of water.
dt represents the change in temperature.
Making dt the subject of formula, we have;
[tex] dt = \frac {Q}{mc} [/tex]
Substituting into the equation, we have;
[tex] dt = \frac {120000}{0.9*4182} [/tex]
[tex] dt = \frac {120000}{3763.8} [/tex]
dt = 31.9K
Now, the final temperature T2 is;
But, dt = T2 - T1
T2 = dt + T1
T2 = 31.9 + 283
T2 = 314.9 Kelvin
Alyssa is taking a walk on a nature path near her neighborhood. She
carries a compass with her. As she walks along the path, she notices
the needle on the compass is occasionally deflected from its original
position. If she has not changed the direction she is walking, what is
most likely causing the occasional shift in the needle? (1 point)
O Changes in pressure
0 Changes in temperature
O Sources of electrical current
O Changes to Earth's magnetic field
Answer:
C. Sources of electrical current!
Hope this helps :)
Answer:
Sources of electrical current
Explanation:
Got it right on the test.
Which refers to the chemical name of CO? carbon monoxide carbon oxide monocarbon monoxide monoxide carbon
Answer:
Carbon monoxide
Explanation:
Carbon refers to the "C" which stands for carbon. Monoxide refers to the single molecule of oxygen present in the substance.
Answer:
Carbon monoxide is the answer here
Explanation:
The initial speed of a dropped ball is 0 m/s after 2 seconds the ball travels at a speed of 20 m/s what is the acceleration of the ball ?
Answer:
Please find attached file
Explanation:
The rate of change of velocity with respect to time is known as acceleration. The acceleration of the ball will be 10m/s.
What is acceleration?The rate of change of velocity with respect to time is known as acceleration. According to Newton's second law, the eventual effect of all forces applied to a body is its acceleration.
The pace at which a body's velocity varies is represented by acceleration, which is a vector quantity.
The given data in the problem is given by ;
u is the initial speed of ball = 0 m/sec
v is the final speed of the ball= 10 m/sec
t is the time interval= 2 second
a is the acceleration of ball=? m/sec²
The formula for acceleration is;
[tex]\rm a=\frac{(v-u)}{t} \\\\ \rm a=\frac{(20-0)}{2} \\\\\rm a=10\ m/sec^2[/tex]
Hence the acceleration of the ball will be 10m/s².
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Get some points uwu
What part of the telescope focuses the light
Answer:
Objective lens is the answer
Electromagnetic waves are
O
A. forms of matter.
O
B. forms of space.
O
C. longitudinal waves.
O
D. transverse waves.
A plane taxies onto the runway, preparing for take off. It starts at rest before it's engines start. The plane's top speed, before it takes off the ground, is about 8820 km/s. If the take off takes about 32.8s, what is the acceleration of the plane?
Answer:
Explanation:
This is a fast plane! At it's takeoff speed, it could fly around the world in 5 seconds!
Acceleration is defined as the change in speed over the change in time.
[tex]a = \frac{v_f - v_o}{t}[/tex]
Where v_f is the final velocity, v_o is the original velocity, and t is the time.
We know v_f = 8820km/s.
v_o = 0 km/s. The plane "starts at rest before it's engine start." So we know it starts from zero velocity.
t = 32.8 seconds.
You can solve the equation from there.
Explain the difference between objects that are sources of light and objects that reflect light
Answer:
sun is the main source while the other object reflect light on the sun
Explanation:
nasa libro yans
A 25.0 kg object is held 8.50 m above the ground. Calculate its PE
Answer:=mgh
Explanation:
PLEASE HELP URGENT 10 points
Answer:
Both have the same amount. C.
Explanation:
in what sense did the flappers dressand dance represent a display of freedom
Answer:
Flappers are symbols of the Thundering Twenties, the social, political disturbance and expanded transoceanic social trade that followed the finish of World War I. Flappers were viewed as reckless for wearing inordinate cosmetics, drinking liquor, smoking cigarettes in broad daylight, driving vehicles and treating sex nonchalantly. They guaranteed that the flappers' dresses were 'close to exposure', 'nervy', 'foolish', and unintelligent.
Someone help me please I need to pass this quiz , this is the only quiz that It making me fail this class !!!
Select the correct items. Click the bottom right arrow to go to the next set . Click the checkmark ( Available on the last set ) to submit all your answers
Slow twitch muscle Fibers
Can contract repeatedly
Only anaerobic sources
Both aerobic & anaerobic
Produce most force
Endurance activities
Fast contraction speed
Fatigue quickly
Only aerobic sources
Speed, strength, power
Fast twitch Type lla muscle Fibers
Only aerobic sources
Fast contraction speed
Speed, strength, power
Only anaerobic sources
Fatigue quickly
Endurance activities
Produce most force
Can contract repeatedly
Both aerobic & anaerobic
Fast twitch type llx muscle Fibers
Can contract repeatedly
Only anaerobic sources
Only aerobic sources
Both aerobic & anaerobic
Fast contraction speed
Produce most force
Fatigue quickly
Endurance activities
Speed, strength, power
Answer:
1. Endurance activities
Only aerobic source
2. Can contract repeatedly
Speed strength and power.
Both aerobic and anaerobic sources
3. Fast contraction speed
Only anaerobic sources
Produce most force
Fatigue quickly
Speed, strength and power
Explanation:
I hope this helps. Although, I'm about 80% sure of the answer.
The radius of the aorta is about 1 cm and the blood flowing through it has a speed of about 30 !" ! . Calculate the average speed of the blood in the capillaries given the total cross section of all the capillaries is about 2000 !"!
Answer:
The average speed of the blood in the capillaries is 0.047 cm/s.
Note: The question is incomplete. The complete question is as follows:
The radius of the aorta is about 1 cm and the blood flowing through it has a speed of about 30 cm/s. Calculate the average speed of the blood in the capillaries given the total cross section of all the capillaries is about 2000 cm².
Explanation:
From the given values:
radius of the aorta, r₁ = 1 cm
speed of blood, v₁ = 30 cm/s
Area of the aorta, A₁ = πr₁² where π = 3.142
Area of aorta = 3.142 × (1)² = 3.142 cm²
Area of the capillaries, A₂ = 2000 cm²
let the average speed of the blood in the capillaries = v₂
From the continuity equation of fluid flow, the product of cross-sectional area of the pipe and the fluid speed at any point along the pipe is always constant. In formula, A₁v₁ = A₂v₂
Using the continuity equation, the average the average speed of the blood in the capillaries can be calculated thus:
A₁v₁ = A₂v₂
v₂ = (A₁v₁) / (A₂)
v₂ = (3.142 x 30) / (2000)
v₂ = 0.047 cm/s
Therefore, the average speed of the blood in the capillaries is 0.047 cm/s.
EASY PLEASE HELP. As the rocket rises, it's kinetic energy changes. at the time the rocket reaches its highest point most of the energy of the rocket has been-
A) permanently destroyed
B) transformed into potential energy
C) converted to friction
D) stored inside the body of the
Answer:
c
Explanation:
What is the distance from one peak to the next peak called?
Answer:
wavelength
Explanation:
Electromagnetic waves is a propagating medium used in all communications device to transmit data (messages) from the device of the sender to the device of the receiver.
Generally, the most commonly used electromagnetic wave technology in telecommunications is radio waves.
Radio waves can be defined as an electromagnetic wave that has its frequency ranging from 30 GHz to 300 GHz and its wavelength between 1mm and 3000m. Therefore, radio waves are a series of repetitive valleys and peaks that are typically characterized of having the longest wavelength in the electromagnetic spectrum.
Basically, as a result of radio waves having long wavelengths, they are mainly used in long-distance communications such as the carriage and transmission of data.
The distance from one peak to the next peak is called wavelength. This distance is also equal to the distance from one trough of a wave to another.
Mathematically, wavelength is calculated using this formula;
[tex] Wavelength = \frac {speed}{frequency} [/tex]
A truck is parked at the bottom of a hill. It moves from the bottom of a hill
and parks at the top. How does the truck's potential energy when it is at
the bottom of the hill compare to its potential energy when it is at the top
of the hill?
A. The truck's potential energy is lower at the top of the hill compared to when it is at the
bottom of the hill.
B. The truck's potential energy is the same at the top of the hill compared to when it is at
the bottom of the hill.
C. The truck's potential energy is greater at the top of the hill compared to when it is at
the bottom of the hill.
D. The truck's potential energy is zero at the top of the hill compared to when it is at the
bottom of the hill.
Answer:
C
Explanation:
potential energy is stored energy that an object has due to its position or chemical composition. Since the truck has the possibility to move down the hill when it is at the top of the hill, it has a great amount of potential energy, howver when its at the bottom of the hill, it doesn’t have the possibility to move or can move v little due to its positions, therefore it has little to no potienatal energy.
The truck's potential energy is greater at the top of the hill compared to when it is at the bottom of the hill. Option (C) is correct.
What is potential energy?The energy held within an object is known as potential energy. There are several different types of potential energy, including gravitational potential energy, elastic potential energy, and electric potential energy.
Here, the energy that an object possesses as a result of its position in relation to other objects is referred to as its gravitational potential energy.
A truck is parked at the bottom of a hill. It moves from the bottom of a hill and parks at the top. its height increases, do, its potential energy also increases. The truck's potential energy is greater at the top of the hill compared to when it is at the bottom of the hill.
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Which is NOT an example of work?
pushing a box across the floor
trying to push a rock that never moves
picking up a box off the floor
raising a barbell over your head
Answer:
trying to push a rock that never moves
Explanation:
let me try my best to break the concepts down for you.
the definition of work done is
work done by a constant force on an object is the product of the force and the distance moved by the object in the direction of the force.
this means that when you apply a force, it must move.
basically it is like holding a book in your hands and not moving, are you fighting the gravitational force?
when you push a box, it definitely moves in the direction you push right?
when you raise the barbel, you are applying a upward force, and barbel us moving upwards, so work is done
hope it helps, if not please report it so that someone else gets to try it
What is a joule?
1 foot/lb
1 meter per second squared
1 meter
1 N-m
Answer:
Input Output
1 ft-lb 12 in-lb
1 in-lb 0.113 Nm
1 Nm 0.7376 ft-lb
1 in-lb 0.0833 ft-lb
1 ft-lb 1.3558179 Nm
1 in-lb 15.999999461875 in-oz
1 Nm 8.850746106833 in-lb
1 l-atm 101.325 J
1 Nm 3.72506E-7 hph
1 J 1 Nm
Explanation:
please mark as briliant
Answer:
1N-m
Explanation:
teacher just taught this an hour ago for my class
Which characteristic is true of sexual reproduction but not of asexual reproduction?
F.produces diverse offspring
G.produces new individuals
H.involves a form of cell division
J.involves one or more parents
Answer:
it has to be ''G''
Explanation:
.
Answer:
J
Explanation:
Sexual reproduction includes 2 parents but asexual reproduction only requires 1.
What are two DIFFERENT resources that can be found on the ocean floor?
Which one is right??
Answer:
Evaporation of water
Explanation:
[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}[/tex]
ur answer is
Evaporation of water.
Differences between luminous and non luminous as a source of light.
Explanation:
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Light
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cee
Hi
Differentiate between luminous and non luminous objects.user
cee
The difference between luminous and non-luminous objects are -:
1. Luminous objects are the objects which emit light energy by themselves are called luminous objects. Whereas, non-luminous objects are the objects which does not emit light energy by themselves. 2) Luminous objects cause the sensation of light. Whereas, non-luminous objects do not cause the sensation of light. 3) Luminous objects are seen on their own. Whereas, non-luminous objects are seen due to luminous objects. 4) Examples of luminous objects are sun, candle, electric bulb. Whereas, examples of non-luminous objects are the moon, chair, plants.
Answer:
Explanation:
Objects that can emit light energy by themselves are known as luminous objects. These objects can cause the sensation of light.Objects that cannot emit light energy by themselves are known as non-luminous objects.These objects do not cause the sensation of light.
Need help ASAP
Thankss + BRAINLIST only for correct answers
1.Which of the following statements about light waves is true? check all correct answers
A.They come from sources across space
B.They travel in a straight line from their source
C.They can travel through any type of material
D.They can be reflected by some types of material
2.Transparent allows some light through
A.True
B.false
Answer:
A, B and D
2. A
Explanation:
1.Which of the following statements about light waves is true? check all correct answers
A.They come from sources across space reason is that a light can travels form its source and its moves across the space
B.They travel in a straight line from their source reason is that the type of light that undergo these is called parallel ray of light
C.They can travel through any type of material reason not all materials light can penetrate through e.g wall
D.They can be reflected by some types of material reason is that some materals reflect light rays e.g polished mirror
Which radio wave technologies would be unaffected by satellites that are not working properly?
space communication and television broadcasting television broadcasting and GPS O MRI and radio telescopes
O radio telescopes and space communication
Answer:
MRI and Radio telescopes
MRI and radio telescopes would be unaffected by satellites that are not working properly.
What is radio wave?The longest wavelengths in the electromagnetic spectrum are found in radio waves, which typically have frequencies of 300 gigahertz (GHz) and lower. The wavelength for 300 GHz is 1 mm, which is shorter than a grain of rice, while the wavelength for 30 Hz is 10,000 km (6,200 miles) (longer than the radius of the Earth).
Radio waves move at the speed of light in a vacuum, as do all electromagnetic waves, and at a nearly identical speed in the Earth's atmosphere.
Among the given options, space communication and television broadcasting television broadcasting and GPS and radio telescopes and space communication are affected by satellites that are not working properly because they are operated by satellite technology.
Hence, only MRI and radio telescopes would be unaffected by satellites that are not working properly.
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A gas is put into a closed container. The container and the gas inside it are heated. What will happen to the pressure inside the container?
Answer:
Explanation:
Plug
4. Explain What happens
to water when an object
hits it?
What is the chemical name for N2O3? nitrogen trioxide dinitrogen trioxide pentanitrogenoxide nitrogen oxide
Answer: The chemical name for N2O3 is dinitrogen trioxide.
Explanation:
Nitrogen occurs chiefly as a free element in the air, making up about 78% by volume of the atmosphere. Nitrogen forms several oxides with oxygen. The formation of these oxides by the direct combination of nitrogen and oxygen required very high temperatures. Examples of oxides of Nitrogen includes:
--> Nitrogen (I) oxide: N20
--> Nitrogen (II) oxide: NO
--> Dinitrogen trioxide: N2O3.
When naming a chemical compound the number of elements in the compound is put under consideration using prefixes such as di (2), Tri(3), tetra(4), penta(5). From the chemical formula N2O3, there are 2 nitrogen atoms and with +3 oxidation state. Hence, the name DINITROGEN TRIOXIDE.
The chemical name of N₂O₃ is dinitrogen trioxide. The correct option is (b).
Two nitrogen atoms and three oxygen atoms make up the chemical molecule known as dinitrogen trioxide (N₂O₃). It is nitrogen oxide. Depending on the circumstances, dinitrogen trioxide exists as either a dark blue solid or a blue liquid.
Dinitrogen trioxide is an unstable and highly reactive substance. Nitric oxide (NO) and nitrogen dioxide (NO₂) gases are easily formed from it:
2 N₂O₃ → 2 NO₂ + O₂
Dinitrogen trioxide undergoes exothermic, or heat-producing, breakdown.
The prefixes "di-" and "tri-" denote the presence of two and three oxygen atoms, respectively, in the molecule. Therefore, dinitrogen trioxide is the name given to the substance N₂O₃.
Hence, the chemical name of N₂O₃ is dinitrogen trioxide. The correct option is (b).
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Giving 12 points for this question.