Answer:
fr = 7.84 N
Explanation:
To solve this exercise we must use Newton's second law, the case of translational equilibrium
F -fr = 0
F = fr
where F is the applied force and fr the friction force
for the Y axis
N -W =
N = W
N = m g
the friction force has the equation
fr = μ N
fr = μ m g
in this case they indicate the two materials that are in contact with wood on wood, so when reviewing the tables the coefficient of static friction is μ=0.4
let's calculate
fr = 0.4 2.0 9.8
fr = 7.84 N
Is the potential energy on the surface of Earth zero?If not,what will be it's value?
Answer:
Potential energy does not have an absolute measurement. It is always relative to some reference point. Gravitational potential always increases when you go up and decreases when you go down. But the choice of a zero point is arbitrary.
If you’re dropping objects onto the ground, then choosing the ground as a zero point makes the calculations easier. But you could just as easily make the zero point the top of Mt. Everest, and all the answers would turn out the same. Up still means more energy and down means less, but now the PE of an object at sea level would have a negative sign, but not as negative as an object ten meters above sea level.
So everything would still work fine.
In fact, planetary astronomers take this idea to extremes. Instead of the top of Mt. Everest, they set the zero point for potential energy as infinitely high—so far “up” that gravity is so weak that going “up” another kilometer doesn’t gain you any energy. Then the value for potential energy everywhere else in the universe anywhere near a planet has a negative sign, but just as before, all the answers in relative terms turn out fine.
Explanation:
PLEASE MARK ME AS BRAINLIEST
Kenetic energy increasing because velocity increased
Answer:
Explanation:
The formula for kinetic energy Ke=1/2mv^2 where Ke is kinetic energy, m=mass, and v= velocity.
If the kinetic energy is increased that means that there must be an increase in mass or velocity. However, since the velocity is squared that means that velocity affects the kinetic energy of the object more than the mass does.
Question 5 of 10
A dog pushes against the front door for 3 seconds with a force of 88 N. What
impulse has the
dog applied to the door?
A. 264 kg•m/s
O B. 77.2 kg•m/s
O C. 29.3 kg•m/s
OD. 128 kg•m/s
SLEMT
Answer:
265 Kg.m/sExplanation:
Impulse = Force × time
So 88× 3 =264!!
Answer:
264 kg*m/s
Explanation:
Explain why the protons can never change for a particular element. What subatomic particles can change and what do they form?
Protons can never change for any particular element because they're in the nucleus and the force keeping them there is extremely strong and hard to overcome. Electrons, however, orbit the nucleus and they change all the time. When electrons either leave or join an atom they form ions.
Positive ions (cations) are when electrons leave, so the positive charge is greater than the negative charges, and negative ions (anions) are when electrons join so the negative charge is greater than the positive charge.
hope this helps!
What is the mass of a bicycle traveling at a speed of 5 m/s and with a kinetic energy of 125 J?
Answer:
K. E= 1/2MV²
125 = 1/2M5²
multiply both side by 2
250 = 25M
M= 10kg
A 5-meter lever has a 4-meter long input arm. If an output force of 500 newtons is attached at one end of the
lever, how much input force must be applied to move the 500-newton output force?
Answer:
125N
Explanation:
500/4=125N
what is evaporation
:D
Answer:
its when a liquid, prolly water, turns into a vapor !!
Explanation:
and nice pic uwu
A liquid turning into a gas is evaporation. It is how water gets from the surface of the Earth to the atmosphere.
Latent heat is a form of energy held in the evaporated water when it evaporates and cools.
Evaporation plays a significant role in the energy exchange that results in atmospheric motion, affecting weather and climate in the Earth-atmosphere system.
The particles with the highest kinetic energy are the first to evaporate from a liquid.
Most of the air's moisture evaporates from rivers, lakes, seas, and oceans. Water at the surface of the Earth evaporates into water vapor, which rises into the sky and forms clouds, which eventually release water back onto Earth as precipitation.
a rock is an example of a solid because
Answer:
The key is that solids hold their shape and they don't flow like a liquid. A rock will always look like a rock unless something happens to it.
Solids can hold their shape because their molecules are tightly packed together.
Explanation:
Yes; it is a solid
What is the density of an object that has a mass of 54g and a volume of 9 mL
Answer:
idc
Explanation:
idc
Name two organelles that contain their own genetic meterial and ribosome
Answer:
Mitochondria and plastids are the two organelles that contain their own genetic material. Both these organelles have their own DNA and ribosomes.
A student reads that soil is formed in part due to the weathering of rocks. The student lists methods in which rocks break down in a chart, as shown.
Weathering of Rocks
1. Acid rain dissolves rock elements
2. Temperature fluctuations cause cracks and fissures in rocks
3. Animals break apart rocks when forming underground burrows.
4. Plant roots apply pressure on rocks
which are accurate methods of the weathering of rocks?
1 and 2 only
3 and 4 only
1.2 and 4 only
1.2.3. and 4
PLEASE PLEASE HELPPP!
Select all that apply!
Answer:
1 AND 3
Explanation:
About how long does it take earth to make a make 1 revolution around the sun a a day be a week see a month d a year
What is the mechanical advantage ????
Answer:
the advantage gained by the use of a mechanism in transmitting force specifically : the ratio of the force that performs the useful work of a machine to the force that is applied to the machine.
Explanation:
Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system. The device trades off input forces against movement to obtain a desired amplification in the output force. The model for this is the law of the lever.
who was the chairman of drafting committe
I only have 3 minutes left this is my last question
An object with a mass of 2.0 kg accelerates 2.0 m/s 2when an unknown force is applied to it. What is the amount of force?
Answer:
4 N
Explanation:
mass = 2 kg
acceleration = 2 m/s^2
Force = mass * acceleration
= 2 *2
= 4 N
A certain reptile species is an herbivore and exists only on an isolated island. Which of the following would most likely result in the extinction of the reptile species over a period of twenty thousand years?
The reptile species produces many offspring with many unique traits, and the vegetation remains constant
The reptile species produces many offspring with some unique traits, and the vegetation remains constant
The reptile species produces few offspring with no unique traits, and the vegetation changes quickly
The reptile species produces many offspring with some unique traits, and the vegetation changes slowly
Answer:
A
Explanation:
Answer:
The answer is D
Explanation:
I took he test and got it correct.
A 4kg object is moving at 5 m/s . A 10-N force is applied in the direction of motion and if the object has a final velocity 10m /s. calculate the distance that the object moves
Answer:
Distance, S = 15m
Explanation:
Given the following data;
Mass = 4kg
Force = 10N
Initial velocity = 5m/s
Final velocity = 10m/s
To find the distance;
First of all, we would calculate the acceleration
Force = mass * acceleration
10 = 4*acceleration
Acceleration = 10/4
Acceleration = 2.5m/s²
Now to find the distance, we would use the third equation of motion.
[tex] V^{2} = U^{2} + 2aS [/tex]
Where;
V represents the final velocity measured in meter per seconds. U represents the initial velocity measured in meter per seconds. a represents acceleration measured in meters per seconds square.S represents the displacement measured in meters.
Substituting into the equation, we have;
10² = 5² + 2*2.5*S
100 = 25 + 5S
5S = 100 - 25
5S = 75
Distance, S = 75/5
Distance, S = 15m
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inis section is worth 7 points or lo total
Listed in the Item Bank are key terms and expressions, each of which is associated with one of the columns. Some terms may display
additional information when you click on them. Drag and drop each item into the correct column. Order does not matter,
ITEM BANK: Move to Bottom
air
lemon juice
pencil lead
plastic
wood
Conductors
Insulators
aluminum foil
glass
drag and drop answe Were
drag and drop answer here
Answer:
I can't get a clear explanation of the question
Physics help please! Offering 75 pts!
Answer:
A
Explanation:
i got it from 2021 edge
Definition of Reverse bump
Answer:As the name implies, the Bump and Run Reversal (BARR) is a reversal pattern that forms after excessive speculation drives prices up too far, too fast. Developed by Thomas Bulkowski, the pattern was introduced in the June-97 issue of Technical Analysis of Stocks and Commodities and also included in his book, the Encyclopedia of Chart Patterns.
THIS AIN'T MINE
Answer:
to collide with (something) with a moderately forceful impact; thump.
Explanation:
Which form of electromagnetic radiation with a relatively high amount of energy is used to sanitize lab goggles?
Answer:
sorry
Explanation:
i don't know this but when i find the answer i will type here
Gamma rays of electromagnetic radiation with a relatively high amount of energy is used to sanitize lab goggles.
What are gamma rays?A gamma ray, also known as gamma radiation, is a penetrating form of electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of the shortest wavelength electromagnetic waves, typically shorter than those of X-rays.
Moreover, gamma rays are the most harmful external hazard. Beta particles can partially penetrate skin, causing “beta burns”. Alpha particles cannot penetrate intact skin. Gamma and x-rays can pass through a person damaging cells in their path.
Therefore, both x-rays and gamma rays are forms of high-frequency (high-energy) ionizing radiation, which means they have enough energy to remove an electron from (ionize) an atom or molecule. Ionizing radiation can damage the DNA (genes) inside a cell. Sometimes this can lead to cancer later on.
Learn more about gamma rays:
https://brainly.com/question/12528914
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Where would you expect to find volcanic mountain ranges and why?
Answer:
Sixty percent of all active volcanoes occur at the boundaries between tectonic plates. Most volcanoes are found along a belt, called the “Ring of Fire” that encircles the Pacific Ocean. Some volcanoes, like those that form the Hawaiian Islands, occur in the interior of plates at areas called “hot spots.”
Explanation:
Volcanoes are found around tectonic plates because the convection currents move the plates. Where convection currents diverge near the Earth's crust, plates move apart. Where convection currents converge, plates move towards each other, plates converge and the plates move together, also known as ridge push, therefore mountains and volcanoes are formed
Hope this helps :)
Long flights at midlatitudes in the Northern Hemisphere encounter the jet stream, an eastward airflow that can affect a plane’s speed relative to Earth’s surface. If a pilot maintains a certain speed relative to the air (the plane’s airspeed), the speed relative to the surface (the plane’s ground speed) is more when the flight is in the direction of the jet stream and less when the flight is opposite the jet stream. Suppose a round-trip flight is scheduled between two cities separated by 4000 km, with the outgoing flight in the direction of the jet stream and the return flight opposite it. The airline computer advises an airspeed of 1000 km/h, for which the difference in flight times for the outgoing and return flights is 70.0 min. What jet-stream speed is the computer using?
Answer:
The jet stream speed used by the computer is 142.[tex]\overline {857142}[/tex] km/h
Explanation:
The given parameters are;
The distance between the two cities the plane flies = 4,000 km
The difference in flight times for outgoing and return flights = 70.0 min
We note that 70 min = 70 min × 1 h/60 min = 7/6 h
The airspeed recommended by the airline computer = 1,000 km/h
Let 'a' represent the jet stream speed
The time it takes the plane moving in the same direction as the jet stream between the two cities, 't₁', is given as follows;
[tex]t_1 = \dfrac{4000}{1000 + a}[/tex]
The time it takes the plane moving in the opposite direction as the jet stream between the two cities, 't₂', is given as follows;
[tex]t_2 = \dfrac{4000}{1000 - a}[/tex]
The difference in flight times for outgoing and return flights, Δt = t₂ - t₁
Therefore, we have;
[tex]\Delta t = t_2 - t_1 = \dfrac{4000}{1000 - a} - \dfrac{4000}{1000 + a} = \dfrac{7}{6}[/tex]
From which we get;
[tex]-\dfrac{8000 \cdot a}{a^2 -1,000,000} = \dfrac{7}{6}[/tex]
By cross multiplying, we have;
-48,000·a = 7·a²- 7,000,000
∴ 7·a² + 48,000·a - 7,000,000 = 0
Factorizing with a graphic calculator gives;
(7·a - 1,000)·(a + 7,000) = 0
∴ a = 1,000/7, or a = -7000
Therefore, the jet stream speed the computer is using, a = 1,000/7 km/h = 142.[tex]\overline {857142}[/tex] km/h.
Some medicines lose their potency when exposed to ultraviolet light. Recommend the type of container in which these medicines should be stored
Answer:
Most likely in a blacked-out air sealed container!
Hope I helped! Plz mark me brainiest I need it!
use the diagram to identify the four regions of the earthworm.
dorsal side:
ventral side:
anterior end:
posterior end:
here are some pictures
Answer:
Dorsal side:B
Ventral side:D
Anterior end:A
Posterior end:C
Explanation:
The four regions of the earthworm are, A is the anterior end,B is the dorsal side, C is the posterior end, and D is the ventral side.
What are earthworms?Earthworms are common soil dwellers who are both safe and useful. Earthworms help plants flourish by collapsing dead and decaying organic debris into rich humus soil.
They also aerate the soil and enhance flow by digging small canals and holes.
The four regions of the earthworm are;
A is the Anterior end
B is the Dorsal side
C is the Posterior end
D is the Ventral side
Hence all the regions are clearly defined with the help of digrame.
To learn more about the earthworms refer to the link;
https://brainly.com/question/20992190
PLEASE HELP ME I NEED THE ANSWER FAST 1 A diver diving into a pool has
a. no energy b. potential energy c. kinetic energy
Answer:
C
Explanation:
A diver diving into a pool has kinetic energy when they hit the water, and that energy transfers and is given to the water, which splashes.
A car starting from rest accelerates in a straight line at a constant rate of 5.5m/s for 6s.If the car after this acceleration slows down uniformly at a rate of 2.4m/s, how long does it take to stop
Answer:
The time it takes to stop is 13.75 seconds
Explanation:
A body moving with constant acceleration, 'a', for a time, 't', has a final velocity, 'v', given by the following kinematic equation;
v = u + a·t
Where;
v = The final velocity of the body
a = The acceleration of the body
t = The time of acceleration (accelerating period) of the body
u = The initial velocity of the body
The given parameters for the acceleration of the car are;
The initial velocity of the car, u = 0 m/s (a car starting from rest)
The constant acceleration of the car, a = 5.5 m/s²
The acceleration duration, t = 6 s
Therefore, we have;
The final velocity of the car after the acceleration, v = 0 m/s + 5.5 m/s² × 6 s = 33 m/s
The final velocity of the car after the acceleration, v = 33 m/s
When the car slows down uniformly, and comes to a stop (final velocity, v₂ = 0 m/s), it has a constant negative acceleration, (deceleration) '-a₂'
The given parameters when the car slows down are;
The deceleration, -a₂ = 2.4 m/s²
The final velocity, v₂ = 0 m/s
The initial velocity, u₂ = v = 33 m/s
The time it takes to stop = t₂
-a₂ = 2.4 m/s²
∴ a₂ = -2.4 m/s²
From, v = u + a·t, we have;
v₂ = v + a₂·t₂
By plugging in the values of the variables, we have;
0 m/s = 33 m/s + (-2.4 m/s²) × t₂
∴ 2.4 m/s² × t₂ = 33 m/s
t₂ = 33 m/s/(2.4 m/s²) = 13.75 s
The time it takes to stop, t₂ = 13.75 seconds
The ______ or _______ of matter depends on how much the particles are moving, which depends on the amount of kinetic energy the particles possess.
Answer:
Temperature or thermal energy.
Explanation:
Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction.
In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.
Hence, the temperature or thermal energy of matter depends on how much the particles are moving, which depends on the amount of kinetic energy the particles possess.