Answer:
Friction
Explanation:
Friction is a force that opposes the movement of an object's relative motion. Friction always goes against the attempted movement of the object when they are in contact. In other words, it is a force that prevents objects from sliding past each other.
The answer is friction.
I took the test and got it right.
The forensic examiner tells the detective that he thinks the body was killed in the country before they found it in New York what type of evidence the need to get to tha conclusion
Dirt samples from clothing to anikise the types then match to the soil of hypothetical location
a car is rolling backward when it hits the gas. after 8.25 s it is moving forward at 8.62m/s, and is 12.9m to the right of its starting pount. what was its starting velocity ?
Explanation:
The given data is as follows.
Final velocity (v) = 8.62 m/s, Initial velocity ([tex]v_{o}[/tex]) = ?
time = 8.25 sec, distance (s) = 12.9 m
Hence, formula to calculate the initial velocity is as follows.
v = [tex]v_{o} + a \times t[/tex]
8.62 m/s = [tex]v_{o} + a \times 8.25 s[/tex]
[tex]v_{o}[/tex] = 8.62 m/s - 8.25a ......... (1)
Also, s = [tex]v_{o} \times t + \frac{1}{2}a \times t^{2}[/tex] ...... (2)
Therefore, substitute the value of [tex]v_{o}[/tex] from equation (1) into equation (2) as follows.
s = [tex]v_{o} \times t + \frac{1}{2}a \times t^{2}[/tex]
s = [tex]8.62 m/s - 8.25a \times t + \frac{1}{2}a \times t^{2}[/tex] ....... (3)
Now, putting the values of s and t into equation (3) as follows.
s = [tex]8.62 m/s - 8.25a \times t + \frac{1}{2}a \times t^{2}[/tex]
12.9 m = [tex](8.62 m/s - a \times 8.25sec) \times 8.25 s + \frac{1}{2}a \times (8.25 sec)^{2}[/tex]
a = 1.71 [tex]m/s^{2}[/tex]
Therefore, using equation (1) the value of initial velocity will be as follows.
[tex]v_{o}[/tex] = [tex]8.62 m/s - 8.25 sec \times a[/tex]
= [tex]8.62 m/s - 8.25 sec \times 1.71 m/s^{2}[/tex]
= -5.49 m/s
Thus, we can conclude that starting velocity of the car is -5.49 m/s.
Answer:
-5.49 m/s
Explanation:
I just had this same question on my Acellus Academy physics course for 9th grade. Hope this helps ;)
Synthetic plastics are made by linking many simple carbon molecules together to form much larger molecules. This process is called
A. polymerization. B. cyclization. C. thermosetting. D. functionalization.
Answer:
A. polymerization
Explanation:
Synthetic plastics are made by linking many simple carbon molecules together to form much larger molecules. This process is called polymerization.
Synthetic or artifical giant molecules consists of synthetic polymers such as plastics, elastomers etc. They are made up of simple monomers which links to form the complex and giant structure.
Monomers are the simplest unit of polymers. Polymers have very great sizes. The size mkaes their structure quite complex. This makes the molecules more disposed in a regular pattern with respect to one another.
The complexity of structure and the attendant effects accounts for the properties and uses that makes synthetic molecules very unique. For example, plastics can be extruded as sheets, pipes and or moulded into other objects.
Answer:
A. Polymerization
Explanation:
Penn Foster
What do opposite poles in magnets do?
Opposite Poles in Magnets Attract Each-other
Joe is known for his fastball throughout the region. It's been said Joe can throw a baseball so fast that, if you blink your eyes, you won't see it travel to the catcher's glove.
What would be the CORRECT metric (SI) units to use to record the average speed of Joe's fastball?
A)cm/s
B)km/h
C)m/s
D)mph
B would be most reasonable
The average speed of Joe's fastball correct SI unit is m/s.
Answer: C
Explanation
According to the problem given, the baseball thrown by Joe reaches the catcher's glove within the blink of audience's eyes.
Generally, human beings tend to blink their eyes every second to some minutes.
So as the ball reaches the catcher's glove within blink of eye that means the motion of the ball starting from thrown by Joe and ending at catcher's glove is completed within seconds. So the speed of the ball is in seconds.
As the catcher will be positioned at some meter distance so the distance traveled will be in meter in SI unit.
So the rate of change of distance per unit second is termed as velocity.
Thus the average speed will be recorded in m/s unit.
What process marks the birth of a star?
Answer:
Magic school bus on ya left! so basically a star is born when like....atoms are like squeezed with enough pressure and kinda squished together, once tht happens the atoms start to fuse together
Explanation:
A star is born when nuclear fusion reactions begin in its core, transforming a protostar into a stable, shining star. This occurs in giant clouds of gas and dust called nebulae.
The birth of a star marks the moment it becomes hot enough for nuclear fusion reactions to take place at its core. This process begins in giant, cold clouds of gas and dust called nebulae. As the cloud collapses under its own gravity, it forms a protostar.
When the core temperature of the protostar reaches about 10 to 12 million K, hydrogen atoms begin to fuse into helium, releasing vast amounts of energy and causing the star to shine. This fusion marks the birth of a new star, which then becomes stable and enters what is known as the main sequence phase of its life, where it spends most of its time.
In simpler terms, the birth of a star is the point at which it starts producing its own energy through fusion, much like a human child begins to sustain itself independently after birth.
Birth of a starNuclear fusionNebulaWhich excited electron has the lowest energy?
Answer:
The lowest energy of electron is the ground state.
Explanation:
The excited electrons has the lowest energy when it is in the ground state.
What are electrons?The electrons are the spinning objects around the nucleus of the atom of the element in an orbit.
Energy of any exited state is given by E = nh/2π where n =0,1,2,3....
As, the number of excited state increases the energy associated with the electron increases.
So, for n=0, the energy is the lowest and is said to be in the ground state.
Thus, the correct option is B.
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Convert to find the equivalent rate.
The answer is 20,260,000
You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. The ball has—— energy. Calculate it
Answer:
945 j
Explanation:
You have just given the ball kinetic energy, which is given by the following equation:
KE= 1⁄2 m v2 = 1⁄2 (2.1 kg)(30 m/s)2 = 945 Joules
How much force is needed to accelerate a 3 kg skateboard at 5 m/s2
Answer:15 newton force is required.
Explanation:
We know that
Force equal to mass x acceleration
3 kg x5 m/ s square
15( kg x m/s square)
15( newton)
15 N
The amount of force that is needed to accelerate a 3 kg skateboard at 5 m/s² is 15N
According to Newton's second law of motion, the formula for calculating the force required to accelerate an object is expressed as;
F = ma
m is the mass of the object
a is the acceleration
Given the following parameters
Mass = 3 kg
Acceleration = 5m/s²
Get the required force:
F = 3 * 5
F = 15 N
Hence the amount of force that is needed to accelerate a 3 kg skateboard at 5 m/s² is 15N
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What is "change" when we are talking about natural and physical systems?
A.
Information that has been proven to be true
B.
A process for using knowledge and skills to acquire new knowledge
C.
Repeated processes that are used in a variety of ways
D.
A variable or alteration to one part that affects an entire system
It would be c repeated processes-that are used in a variety of ways
Answer:
the correct answer would be D. A variable or alteration to one part that affects an entire system.
the other ones dont make sense
~batmans wife dun dun dun....
why it is dangerous for a bus to carry standing passengers
because if the bus goes to stop or go that person would be injured badly that is y the bus driver tells u to sit down
Most of the weight of standees is from their feet, which are on the floor, so they should be raising the center of gravity much.
I think just the added weight of standees makes the bus suspension less able to control sway and lean. Going into a curve or skid with more passengers means a better chance of rolling.
I've taken some curves with what we called a "full swinging load" that made my hair stand on end the bus leaned over so far.
Really busses can lean pretty far without going over. Another fun thing is if the air suspension bellows blow out on one side or a front tire blows out. Definitely gets your attention and not just because the passengers are screaming.
Going back to center of gravity, if the bus sways or leans on a curve and more of the passengers weight is transferred to the overhead bar that might make a difference, once the lean gets bad because of the weight in general.
a certain spring has a spring constant of 1962 n/m.if its period of vibration is 1.419 s, what is its mass?
Answer:
100.2 kg
Explanation:
The period of vibration of a spring-mass system is given by
[tex]T=2\pi \sqrt{\frac{m}{k}}[/tex]
where
T is the period
m is the mass
k is the spring constant
In this problem, we know
T = 1.419 s is the period
k = 1962 N/m is the spring constant
Re-arranging the equation, we can find the mass:
[tex]m=k(\frac{T}{2\pi})^2=(1962 N/m)(\frac{1.419 s}{2\pi})^2=100.2 kg[/tex]
Can someone help me with any of these problems or all of them? It will get you an easy ten points per question
Answer: For number 9, the children would not be able to close the box.
Explanation: The combined force of the children is 55 N. The box spring overpowers them with 60 N. I hope this helps!
Which constellation is marked by a W or M? a. Cassiopeia b. Draco c. Ursa Minor d. Ursa Major
I believe it is the Cassiopeia. It is visible during winter in the early part of the night. It look like a distorted letter W or M.
I am not very sure of it though, I apologize if this is not what you meant.
Answer:
Ursa Minor Constellation
Explanation:
Ursa Minor constellation lies in the northern sky. The constellation's name means “the smaller bear,” or “the lesser bear,” in Latin. The Great Bear constellation is represented by its larger neighbor Ursa Major.
The light reflected from the surface of a pool of water is observed through a polarizer. How can you tell if the reflected light is polarized?
To determine if the light reflected from the surface of a pool of water is polarized, you can use a polarizer and observe if any changes occur when the polarizer is rotated.
What is a polarizer?A polarizer is a virtuously optical device that can convert an unpolarized light beam into a polarised light beam in some way.
Here,
To determine if the light reflected from the surface of a pool of water is polarized, you can use a polarizer and observe if any changes occur when the polarizer is rotated.
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What causes ocean water around the equator to be warmer then the ocean water farther south of the equator
A. Gyres in the northern hemisphere flow clockwise.
B. Upwellings spew warm water toward the equator.
C. The sun heats earth and it’s oceans unevenly.
D. Deep sea vents pump stream into oceans unevenly.
C. The sun heats earth and it’s oceans unevenly.
Hope this helps chu
Have a great day
☆ Dont forget to mark brainliest ☆
Answer:
The correct answer is option C. "The sun heats earth and it’s oceans unevenly".
Explanation:
Ocean water is warmer around the equator than the currents that come farther south of the equator. This phenomenon happens because the sun heats earth and its oceans unevenly since the amount of energy that reaches the Earth is a function of latitude. The equator has a 0 degree latitude, and is at this point at which the Earth receives more heat from the Sun
On vacation at the beach, you bring a radio to the beach. The radio can pick up several different radio stations.Which is the best explanation for this?
A) Sound waves can travel from through the air from the station to your radio.
B) Radio stations broadcast from different locations using their own transmitters.
C) Sound of different pitches are used to transmit information from each radio station. These sound waves can travel over land.
D) Waves are used to transmit the radio signal through the air. These waves are encoded at different frequencies for different stations.
D) waves are used to transmit the rail signal though the air. these waves are encoded at different frequencies for different stations
Answer:
The correct answer is D.
Explanation:
The radio can pick up several different stations because the waves are used to transmit the radio signal through the air. These waves are coded at different frequencies, assigned to different radios. The waves do not mix, so we can tune several radio stations.
Have a nice day!
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If the following batteries; AAA, AA, C Cell, and D Cell were all 1.5 volts, would the light bulb shine the same in a simple circuit? Explain your answer.
Answer:
Step By Step Explanation:
A lightbulb has a resistance of 195 Ω and carries a current of 0.62 A.
The power rating of the lightbulb, to the nearest whole number, is
______ W.
Answer:
75
Explanation:
Power is current times voltage:
P = IV
Voltage is current times resistance:
V = IR
Therefore:
P = I²R
Given I = 0.62 A and R = 195 Ω:
P = (0.62 A)² (195 Ω)
P ≈ 75 W
which of these is an indication that a chemical reaction has occurred?
1) melting of a substance
2) boiling of a substance
3) formation of a precipitate
4) freezing of a substance
3.
If the reaction forms a new substance it's a chemical reaction.
A wave has a wavelength of 3.3m and a speed of 5.6m/s . What is the frequency of this wave?
Frequency = (speed) / (wavelength)
Frequency = (5.6 m/s) / (3.3 m)
Frequency = (5.6 / 3.3) per sec
Frequency = 1.7 Hz
which product is typically made using soft wood
Answer:
i think it is c
Explanation:
Answer:its plywood
Explanation:i just took the test
A jetliner flies east 2000 miles from San Francisco to Chicago. It has an average air speed of 600 mph relative to the air. What is the velocity of the jetliner relative to the earth if the wind is blowing at 150 mph from the west to the east?
450 mph, west
750 mph, east
750 mph, west
450 mph, east
Answer:
750 mph, east
Explanation:
The jetliner is going from San Francisco to Chicago... so it's moving from West to East, at 600 mph, relative to the air.
The wind is also moving from West to East, at 150 mph.
Since both are going in the same direction, we combine the speeds by adding them to each other. If they were in opposite direction, we would subtract them.
So, 600 mph for the plane + 150 mph for the wind = 750 mph, going EAST.
The velocity of the jetliner relative to the earth, considering a wind blowing at 150 mph from the west to the east, is 750 mph, east.
Explanation:In this scenario, the jetliner's velocity relative to the earth can be calculated by adding the velocity of the jetliner relative to the air (600 mph to the east) and the velocity of the wind (150 mph to the east). This means that the jetliner and the wind are moving in the same direction (east), you would add their speed together.
Performing the addition: 600 mph (jetliner's speed) + 150 mph (wind's speed) = 750 mph.
Since wind and jetliner are moving to the East, the correct answer to the question 'What is the velocity of the jetliner relative to the earth?' is 750 mph, east.
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2. Periods are
that run from left to right
3. Elements in the same period have the same
Every element in the first period has
element in the second period has
pattern?
shell for its
for its
Every
See the
5. Groups are
that run from top to bottom.
6. The elements of a group have the same number of
shell.
in their
7. Every element in group one has
element in group two has
electron in its outer shell. Every
electrons in its outer shell.
8. Hydrogen is special because it can act like two groups,
and
9. Hydrogen sometimes is
electron.
an electron and sometimes it has an
electrons in its outer shell, it is grouped
10. Although helium has only
with elements that have
elements. They each
11. The green elements on this table are called
have two electrons in their outer shell.
Answer:
8bfdyg8oea
Explanation:
Final answer:
Periods on the periodic table are horizontal rows that reflect the number of electron shells of elements, which range from 1 to 7. As you move across a period, the number of electrons increases. In contrast, groups are vertical columns where elements share the same number of valence electrons, leading to similar chemical properties.
Explanation:
In the context of the periodic table, periods are horizontal rows that define the arrangement of elements. These periods range from left to right and are numbered 1 through 7, starting at the top of the table. Periods indicate the number of electron shells an element has, with each period beginning when a new principal energy level commences to fill with electrons. For instance, period 1 has only two elements: hydrogen and helium. Other periods have more elements, reflecting additional electrons filling the subsequent principal energy levels.
The elements within a period have the same number of electron shells, but as you move from left to right across the table, the number of electrons in the outer shell increases for the elements. This progression affects their chemical and physical properties. When it comes to groups, the vertical columns of the periodic table, elements in the same group have identical numbers of electrons in their valence shell, contributing to similar chemical behavior.
Seriously need help with these.. HELP PLEASE!!! 30+ points!! i will mark brainliest!!
a book is 9.26 cm tall and placed 22.7 cm to the left of a plane mirror. What is the height of the image formed by the mirror?
4.63
18.5
2.45
9.26
a book is 9.26 cm tall and placed 22.7 cm to the left of a plane mirror. What is the magnitude of the image distance?
22.7
9.26
24.5
11.4
You move away from a plane mirror at a speed of 1.60 m/s. At what speed does your image move away from you?
1.60 m/s
3.20m/s
6.40m/s
0.40m/s
Answer:
9.26 cm, 22.7 cm, 3.20 m/s
Explanation:
In a plane mirror, the image and object have the same height. So h = 9.26 cm.
In a plane mirror, the image distance is the same as the object distance. So x = 22.7 cm.
Since the distance between an object and a plane mirror is the same as the distance between the mirror and the image, then the distance between you and the image is double the distance between you and the mirror. If you move away from the mirror at 1.60 m/s, the image will move away from you at double that speed, or 3.20 m/s.
An ocean wave has a wavelegth of 2 meters and a period of 5 seconds. What is the speed of the wave
Answer:
0.4 m/s
Explanation:
First of all, let's find the frequency of the wave, which is equal to the reciprocal of its period:
[tex]f=\frac{1}{T}=\frac{1}{5 s}=0.2 Hz[/tex]
Now we can find the wave speed using the formula:
[tex]v=f\lambda[/tex]
where
f = 0.2 Hz is the frequency
[tex]\lambda=2 m[/tex] is the wavelength
Substituting, we find
[tex]v=(0.2 Hz)(2 m)=0.4 m/s[/tex]
how did advances in technology influence the development of the microscope/ check all that apply
Answer:
New technology allowed microscopes to make it easier to view things that had never been seen before, such as cells.
Explanation:
Answer:
BCDE
Explanation:
zeros are always considered significant digits when they are to the left of the decimal point
Answer:
Zeros to the left of a decimal can be insignificant place holders, such as in 0.043 (two significant figures).
They can be significant if they are between two digits who themselves are significant, such as in 101.000 (three significant figures).
In the case of a number like 1,000 we can see there is only one significant figure. The zero digits are not between sigfigs.
Answer:
Zeros to the left of a decimal can be insignificant place holders, such as in 0.043 (two significant figures).
They can be significant if they are between two digits who themselves are significant, such as in 101.000 (three significant figures).
In the case of a number like 1,000 we can see there is only one significant figure. The zero digits are not between sigfigs.\
Quarks are thought to be the basic component of _____.
protons
electrons
neutrons
Answer:
Explanation:
The answer is neutrons and protons. The proton for example is composed of 3 quarks with charges of 2/3 + 2/3 - 1/3 which gives an overall charge of 1.
Neutron are composed of 2 quarks that are - 1/3 in charge and 1 that has a charge of 2/3. The overall charge is 0.
Answer:
Neutrons,ProtonsExplanation: