The supply of energy and of each needed chemical element restricts a system operation -- for example , without inputs of energy ( sunlight ) and matter ( carbon dioxide and water ) , a plant cannot grow. Hence , it is very informative to track the transfers of matter and energy within , into , or out of any system under study.
Hope it helps
Scientists track the energy in a system for analyzing and comparison of the efficiencies of the different systems, to know whether one system has some advantage over another
What is thermal energy?Thermal energy also referred to as heat energy, can be described as the type of energy in which heat is transmitted from one body to another body as a result of its molecular movements.
The accepted unit for calculating energy is the joule (J). The unit of measurement for electric energy known as the kilowatt-hour (kWh) should be mentioned among the most popular ones (in fact it is used to calculate electricity bills). The Terawatt/hour (TWh), or one billion kW/h, is used to determine a large power plant's production or a nation's consumption.
Thus, To analyze and compare the efficiencies of various systems and determine whether one system has an advantage over another, scientists monitor the energy in a system.
Learn more about thermal energy from here
brainly.com/question/3022807
#SPJ5
If the light rays in the incident ray originate at 20º from the surface...
What is the angle for the incident ray?
a.) 10 degrees
b.) 20 degrees
c.) 40 degrees
d.) 70 degrees
e.) 90 degrees
What is the angle for the reflected ray?
a.) 10 degrees
b.) 20 degrees
c.) 40 degrees
d.) 70 degrees
e.) 90 degrees
Can someone help me with this please? Thank you!
Given :
The light rays in the incident ray originate at 20º from the surface.
To Find :
The angle for the incident ray.
Solution :
We know angle of incidence is measured from perpendicular to the surface .
So,
[tex]\theta_i = 90^o - 20^o\\\\\theta_i = 70^o[/tex]
Now, we know by law of reflection :
Angle of reflection = Angle of incident
[tex]\theta_r = 70^o[/tex]
Therefore, the angle of incident and reflection is 70° each.
Which of the following is NOT TRUE of elements?
Answer:
all parts are aline
the last option
A student reads that nanosilver particles are used in cosmetics to allow nutrients to penetrate deeper into the skin. When the cosmetics are washed off, the nanosilver particles can enter freshwater ecosystems. These particles may decrease survival in many aquatic organisms. The student determines that Daphnia magna, a tiny freshwater crustacean widely found in North America, might make a good test subject for an experiment.
Which statement below is the most likely testable hypothesis based on the information provided?
A. When the concentration of nanosilver particles in water and the temperature of water are both increased, the population of Daphnia magna will decrease.
B. When the concentration of nanosilver particles in water and the temperature of water are both increased, the population of Daphnia magna will decrease.
C. When the concentration of nanosilver particles in water is increased, the population of Daphnia magna will adapt to new conditions and become a new species.
D. When the concentration of nanosilver particles in water is decreased, the population of aquatic organisms that feed on Daphnia magna will increase.
Answer: When the concentration of nanosilver particles in water is increased, the population of Daphnia magna will decrease
Explanation:
The statement below that is the most likely testable hypothesis based on the information provided is that when there is an increase in the concentration of nanosilver particles in water, the population of Daphnia magna will decrease.
Since we are informed that the particles may decrease survival in many aquatic organisms, it simply means that an increase in the particles in water will bring about the decrease in the Daphnia magna, which is the tiny freshwater crustacean.
A crate (m = 100 kg) is pulled across a floor to the right with a rope horizontal to the floor. The tension in the rope is 400 N. The coefficient of kinetic friction is 0.4. What is the acceleration? If started from rest, what was the velocity after 3 seconds?
Answer:
Explanation:
Force of friction acting on the crate = μ mg
= .4 x 100 x 9.8 = 392 N
Net force acting on the crate = 400 -392 N = 8 N .
acceleration = net force / mass
= 8 N / 100 kg
= .08 m /s²
velocity after 3 s.
v = u + at
= 0 + .08 x 3
= 0.24 m/s .
predict the date of the next full moon.
please help me quickly i will give you branliest! ๑>ᴗ<๑
Answer:
The 19th
Explanation:
going based off of the calandar, you just start from the 4 at the bottom and then just count up as you go through it agains starting back at the top.
Answer: the 19th
Explanation:
count the number of days it takes you to get from full moon (20th) to no moon (4th)
it takes 15 days to get to the no moon phase
so theoretically if we add 15 days to the 4th when there was no moon, we should find the day when there is a full moon
4 + 15 = 19
so the full moon should happen on the 19th :))
What makes a model not useful?
A.) if it is in proportion with the object it represents
B.) if it is made of a different material than the object it represents
C.) if it is not the same mass of the object it represents
D.) if it is out of proportion with the object it represents
A ray of light has a wavelength of 284 nm in glass (n = 1.51). What is its wavelength in a vacuum? (Remember, the wavelength is longer in a vacuum.) (Unit = nm)
Answer:
428.8 nm
Explanation:
A force of 20 newtons
is used to much a box
a distance of 2
meters. How much
work was done?
Answer:
Workdone = 40 Nm
Explanation:
Force = 20 Newton
Distance = 2 meters
To find the work done;
Mathematically, work done is given by the formula;
Workdone = force * distance
Workdone = 20 * 2
Substituting into the formula, we have;
Workdone = 40 Nm
what are the causative agents of diseases?
Answer:
Viruses, bacteria, fungi, protozoa, helminths(worms)
A radio wave has a frequency of 3,000,000 Hz and a wavelength of 100m. What is the speed?
Answer:
300,000,000
Explanation:
Use the speed formula
Speed= wavelength x frequency
What is the frequency of a wave moving at 1782 m/s if its wavelength is 30.2 m?
Answer:
Explanation:
Wavelength = Velocity / Frequency
= 1782/30.2
= 59 metre.
How does the Doppler effect cause a siren's pitch to increase as it
approaches you?
A. Sound waves are spread out, decreasing wavelength and
increasing frequency.
B. Sound waves are spread out, increasing wavelength and
decreasing frequency.
C. Sound waves are pushed closer together, increasing wavelength
and decreasing frequency.
D. Sound waves are pushed closer together, decreasing wavelength
and increasing frequency.
Answer:
my answer is c
Explanation:
the sound waves get closer together, increasing their frequency. This listener hears the pitch of the siren get higher. As the car speeds away from listener B, the sound waves get farther apart, decreasing their frequency.
Name and describe at least 2 specific types of energy that would
be found in a moving car.
Answer:
Kinetic and potential energy.
Explanation:
An object possessing mechanical energy has both kinetic and potential energy, although the energy of one of the forms may be equal to zero. A moving car has kinetic energy. If you move the car up a mountain, it has kinetic and potential energy. A book sitting on a table has potential energy.
Match the following. Match the items in the left column to the items in the right column.
1. March 21
7
North Pole
2. Arctic
vernal equinox
3. December 21
longitude
4. meridians
lowest point on earth
5. September 23
latitude
6. Greenwich, England
South Pole
7. Antarctic
winter solstice
8. Marianas Trench
autumnal equinox
9. parallels
Prime Meridian
10. International Date Line
180th meridian
Answer:
March 21 = Vernal Equinox
Artic = North Pole
December 21 = Winter Solstice
Meridians = Longitude
September 23 = Autumnal Equinox
Greenwich, England = Prime Meridian
Antarctic = South Pole
Marianas Trench = Lowest point on earth
Parallels = Latitude
International Date Line = 180th Meridian
Explanation:
Which of these does not represent a direct transfer of carbon
1.Air to trees
2.Giraffe to tree
3.Tree to giraffe
Answer:
The correct answer is - 2. Giraffe to trees.
Explanation:
In the carbon cycle, the movement of carbon is represented how it moves from one sphere to other and how it transfer among the different organism. The carbon moves from air to the trees in the form of carbon dioxide that is used by trees for the production of glucose by the process of photosynthesis through stomata.
The movement of the carbon among trees to different herbivores including giraffe is transferred by the eating of the leaves or fruits of the tree that carries glucose or starch. The transfer of carbon through giraffe does not take place directly but takes the release of carbon dioxide by the process of cellular respiration to the atmosphere.
Please help me thanks please please
I will give you brainlest
Answer:
We know that F=ma
the force required depends on acceleration as well as the mass.
if a person has bag means the total mass is of course large
so force is also large
then it becomes difficult
If a 50 kg person is running at a rate of 2 m/s, the person’s momentum is
_____________ kg • m/s.
when you look at your speedometer and it reads 60 mph this is your instantaneous speed
true
false
true true tire true tire ture
please mark brainlist
The given statement is true when you look at your speedometer and it reads 60 mph this is your instantaneous speed.
What is Speed ?In everyday language, most people use the terms speed and velocity interchangeably. In physics, however, they do not have the same meaning and are distinct concepts. One major difference is that speed has no direction; that is, speed is a scalar.
We can calculate the average speed by finding the total distance traveled divided by the elapsed time:
Average speed=Total distance=Elapsed time.
Average speed is not necessarily the same as the magnitude of the average velocity, which is found by dividing the magnitude of the total displacement by the elapsed time. For example, if a trip starts and ends at the same location, the total displacement is zero, and therefore the average velocity is zero. The average speed, however, is not zero, because the total distance traveled is greater than zero. If we take a road trip of 300 km and need to be at our destination at a certain time, then we would be interested in our average speed.
However, we can calculate the instantaneous speed from the magnitude of the instantaneous velocity:
Instantaneous speed
=|v(t)|.
If a particle is moving along the x-axis at +7.0 m/s and another particle is moving along the same axis at −7.0 m/s, they have different velocities, but both have the same speed of 7.0 m/s. Some typical speeds are shown in the following table.
We have now seen how to calculate the average velocity between two positions. However, since objects in the real world move continuously through space and time, we would like to find the velocity of an object at any single point. We can find the velocity of the object anywhere along its path by using some fundamental principles of calculus. This section gives us better insight into the physics of motion and will be useful in later chapters.
Learn more about Speed
https://brainly.com/question/13943409
#SPJ2
Which of these shows the correct sequence of development?
Which of these increases the kinetic energy of a car the most?
A. Doubling the mass
B. Doubling the velocity
C. They are the same
Answer:
A. Doubling the mass
Explanation:
Doubling the mass increases the kinetic energy of a car the most.
Doubling the mass increases the kinetic energy of the car.
What happens to a car when the kinetic energy is increased?The energy possessed by a body due to its motion is known as the kinetic energy.The kinetic energy completely depends upon the object's mass and velocity.The unit of kinetic energy is Joule.The formula is K.E = 1/2 mv².The unit of mass is kilogram (kg), then the unit of velocity is meter/ second. (m/s)1 Joule = 1 Kg m²/ s².
As we know the formula, Kinetic energy is equal to half of the product mass and velocity. If mass doubled then kinetic energy also gets doubled.Here, If the car was moving, there will be some kinetic energy as it has the particular mass and speed ( velocity).The kinetic energy of a car increases if the mass gets doubled.Hence, Option A is the correct answer.
Learn more about Kinetic energy,
https://brainly.com/question/4080953
#SPJ2
In which stars will you likely find fusion of heaveir elements such as helium and oxygen
when a lorge heavy truck collieds with a
passenger car, the occupants of
Car hit more
likely to be hurt than the
truck driver?
1) T or F... The universe has always existed the way that it is now.
True
False
Answer:
False the universe has not always existed the way it does now.
Explanation:
Answer: False
Explanation: The Universe continues to expand even today, growing at a rate of 6.5 light-years in all directions per year as time goes on.
Where, When, What occured in Australian Wildfires?
1. Where?
2. When?
3. What ?
On 11 November a fire started in the Ravensbourne area near Toowoomba, which burnt through over 20,000 hectares (49,000 acres) of bush across several days, destroying six houses.
Please answer this science question NO LINKS !!!!
What is the reason eclipses do not happen every full moon and new moon
A. The moon rotates around itself slower than Earth rotates around itself
B. The moon completes a rotation around the earth faster than earth complete a rotation around the sun
C. The moon has a much smaller mess than earth or the moon
D. The moons orbit around the earth is tilted compared to the earths orbit around the sun
A 12 kg
mass is lifted to a height of 2 m. What is its potential energy
at this position?
Answer:
Explanation:
Potential energy is the energy stored within an object, due to the object's position, arrangement or state
Answer:
240joules
Explanation:
P:E = MGH
mass 12kg
g is constant as 10m/s²
h is 2m
therefore, 12*10*2 =240joules
pls pls help for brainliest
pls help for brainliest:)
If an object is placed 10cm in front a double convex lens that has a focal length of 15cm, what will be the resulting distance? What type of image this?
A. 20cm; real image
B. 15cm; virtual image
C. -30cm; virtual image
D. -5cm; real image
Answer:
This would be C.
Explanation:
"according to lens formula Given f = +15 , u = -10 , v= ? Hence to find v rearrange lens formula i.e = Hence v = -30 and negative sign show image is virtual." Chegg.
What can waves be transmitted by? How do you know?
Answer:
i don’t know what kind of waves you mean but if you’re talking about sound waves...
Explanation:
“Sound waves are transmitted through solids, liquids, and gases. Light waves are transmitted through transparent materials (may be clear or colored material such as filters) that allow most of the light that strikes them to pass through them. Only a small amount of light is reflected or absorbed.”
Polarization is the action of restricting the vibrations of a transverse wave wholly or partially to one direction.
O True
O False
