Răspuns:
0,98 N
Explicaţie:
Dat fiind:
µ = Coeficientul de frecare = 0,02
Masa (m) = 5 kg
Folosind relația:
Forța de frecare (F) = µ * N
N = reacție normală = masă * accelerație datorată gravitației
Prin urmare,
F = u * m * g
g = 9,8 m / s²
F = 0,02 * 5 kg * 9,8 m / s²
F = 0,98 kgm / s²
F = 0,98N
Think about a typical school day. In the space provided below, describe how each of the different forms of energy we have learned about (chemical, electrical, heat, kinetic, potential, and solar) are used during a typical school day and how each form of energy is transformed into another.
Answer:
During a typical school day all forms of eneergy is being utilised and also transfer of energy takes place from one form to another.
Explanation:
Chemical energy- A bunsen burner burning a beaker filled with water.
Heat energy- The water in the beaker absorbing the heat from the burner.
Electrical energy- Running Fans and lights in a classroom by switches.
Solar energy- Solar energy harnessed by solar panels to run the fans and lights by converting it into electrical energy.
Potential energy- A ball being held by a student at a certain height possesses energy due to gravity.
Kinetic energy- The same ball being left by the boy from a certain height produces kinetic energy
Answer:
Explanation:
Chemical energy- A bunsen burner burning a beaker filled with water.
Heat energy- The water in the beaker absorbing the heat from the burner.
Electrical energy- Running Fans and lights in a classroom by switches.
Solar energy- Solar energy harnessed by solar panels to run the fans and lights by converting it into electrical energy.
Potential energy- A ball being held by a student at a certain height possesses energy due to gravity.
Kinetic energy- The same ball being left by the boy from a certain height produces kinetic energy
A race car, moving initially with a speed of 15.0 m/s, is capable of accelerating at a rate of 6.0 m/s?. What will be the speed
of this car after accelerating for a time period of 8.00 seconds?
m/s
Answer:
[tex]v_{f}=63\ \frac{m}{s}[/tex]
Explanation:
[tex]v_{f}=v_{i}+a\cdot t[/tex]
[tex]v_{f}=15\ +\ 6\cdot8[/tex]
[tex]v_{f}=63\ \frac{m}{s}[/tex]
Therefore, the speed of the car is 63m/s after 8 seconds while accelerating at it maximum capability.
Why do the north poles of these two magnets repel each other? A. The magnetic field that forms between the two north poles is new and different B. Each north pole has a magnetic field that repels the magnetic field of the other. C. Each south pole has a magnetic field that repels the magnetic field of the other D. South poles repel each other, and north poles attract each other.
The statement fourth "The magnetic field lines go in directions that cannot combine to form a magnetic field between the two north poles" is the correct option (B) is correct.
What is a magnetic field?The magnetic field is defined as the field the magnetic materials generate or when an electric charge moves in a field region that generates the magnetic field.
The magnetic impact on electric charges, electric currents, and magnets is described by a magnetic field, which is a vector field. A force opposite to the sword's own motion and also the magnetic force acts on it while the charge is traveling through a magnetic field.
Thus, the statement fourth "The magnetic field lines go in directions that cannot combine to form a magnetic field between the two north poles" is the correct option (B) is correct.
Learn more about the magnetic field here:
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Which group includes the most complex body structures
A: cardiac tissue, bone marrow, Epithelial tissue
B: neuron, White blood cell, smooth muscle cell
C:Brain cells, red blood cells, white blood
cell
D: skin, small intestine, lungs
Answer:
C.
explanation: Brain cells are the most complex body structure because they control everything.
if object A has a mass of 100kg and object B has a mass of 50 kg then which will have more inertia
Answer:
object A
Explanation:
this is because Enertia is the resistance of an object to change its initial state of rest or motion DUE TO ITS MASS
SO a heavier object will render more inertia
if you have learnt sound, can you also help me pleaseeee
An 80kg sled rider starts sledding down a 100m hill from rest. If her final velocity is 15m/s, what is he acceleration down the hill? What is the force needed for that kind of acceleration
Given :
An 80kg sled rider starts sledding down a 100m hill from rest. If her final velocity is 15m/s.
To Find :
The acceleration down the hill.
The force needed for that kind of acceleration.
Solution :
By equation of motion :
[tex]v^2 -u^2 = 2as\\\\a = \dfrac{v^2-u^2}{2s}\\\\a = \dfrac{15^2 -0^2}{2\times 100}\\\\a = 1.125\ m/s^2[/tex]
Force required is, F = ma
F = 80×1.125 N
F = 90 N
Hence, this is the required solution.
What does dalton theory have in common with democritus
Answer:
Democritus and Dalton has similar ideas about the atom, but Democritus based his theory more on reason than science. ... His ideas were similar to those of Democrites in that he believed that atoms were indivisible and that atoms of one substance are all alike but are different from atoms of another substance.
Explanation:
PLS MAKE ME AS BRAINLIST
Answer:
Democritus and Dalton has similar ideas about the atom, but Democritus based his theory more on reason than science. ... His ideas were similar to those of Democrites in that he believed that atoms were indivisible and that atoms of one substance are all alike but are different from atoms of another substance.
Explanation:
what type of process occurs at constant pressure
Answer:
isobaric process
Explanation:
An isobaric process occurs at constant pressure. Since the pressure is constant, the force exerted is constant and the work done is given as PΔV.
Answer:
well for me I think it's
Explanation:
Charles law in gas laws
help!!! if it’s blurry click on it and zoom in but i need to know the net forces!!!
Answer:
the net force is 330N
Explanation:
Answer:
270N to the left
Explanation:
Since the 3 individual forces are all parallel to each other and effect the x-axis, you can add and subtract them to find the net force.
The three forces are:
200 N to the LEFT
300 N to the LEFT
230 N to the RIGHT
First, add up any multiples of forces with the same direction. Basically, add up all the forces going LEFT and all going RIGHT.
200 N + 300 N = 500 N LEFT
230 N RIGHT
In order to find resultant magnitude you must now subtract the larger force from the smaller force. The resultant direction will be in the direction of the larger force.
Magnitude of Net Force: 500 N - 230 N = 270 N
Net Force Direction: Direction of larger force: Direction of 500N force: LEFT
TRUE/FALSE::: Mechanical waves move through matter by taking the matter/ medium
with it and moving it a distance.
Answer:
FALSE
Explanation:
PLS MAKE ME AS BRAINLIST
What is the ideal banking angle (in degrees) for a gentle turn of 2.00 km radius on a highway with a 125 km/h speed limit (about 78 mi/h), assuming everyone travels at the limit
An "ideal" banking angle assumes no friction is required to keep a car on the road as it turns. Let θ denote the banking angle, and consult the attached free-body diagram for a car making the turn. There are only 2 relevant forces acting on the car,
• the normal force with magnitude n
• the car's weight with magnitude w
and the net force points toward the center of the circle made by the turn, with centripetal acceleration
a = (125 km/h)² / (2.00 km) = 7812.5 km/h² ≈ 0.603 m/s²
Split up the forces into components acting perpendicular (⟂) and parallel (//) to the banked curve, so that by Newton's second law,
∑ F (⟂) = N + W (⟂) = m a (⟂)
and
∑ F (//) = W (//) = m a (//)
Let the direction of N be the positive perpendicular axis, and down the incline and toward the center of the circle the positive parallel axis. The net force vector and acceleration both make an angle θ with the banked curve, and W makes the same angle with the negative perpendicular axis, so that the equations above reduce to
N - m g cos(θ) = m a sin(θ)
and
m g sin(θ) = m a cos(θ)
The second equation is all we need at this point to find the ideal θ. The mass m cancels out, and we can solve for θ to get
tan(θ) = a/g ≈ (0.603 m/s²) / (9.80 m/s²) ≈ 0.0615
→ θ ≈ 3.52°
Why's earths magnetosphere important ?
Answer:
The Earth's magnetic field protects life on Earth, shielding it from damaging radiation and moderating our climate. So the idea that it could completely flip around, or collapse altogether, should cause us
PLEASE MARK AS BRAINLIEST ANSWER
Who was Alfred Wegener and what did he theorize?
Answer:
Who was Alfred Wegener: He was a German meteorologist and geophysicist
What did he theorize: he theorized continental drift and he also explained how all 7 continents were once together( aka Pangaea) on earth over millions of years ago.
Hope this helped a little!
Pick the correct word: inertia, whiplash, resistance, friction , force to fill up the blank in below question.
When hit from behind in a car crash, a passenger can suffer a neck injury from the forward and backward motion called _______.
Answer:
It is whiplash I hope this is right
how did Albert Einstein come up with 3 = mc square pls help
Answer: He came up with this by using theories like the photoelectric effect, the second offered experimental proof of the existence of atoms, and the third introduced the theory of special relativity.
Explanation: He was explaing the realationship between energy and mass.
Me: Hope this helps!!! May I have brainlist!?
An object at rest will stay at rest until an external force acts on it. What was the external force that acted on the night once the hoop was removed?
Explanation:
The first law states that a body at rest will stay at rest until a net external force acts upon it and that a body in motion will remain in motion at a constant velocity until acted on by a net external force.Friction is the force between an object in motion and the surface on which it moves. There was a net external force on the night because of change in momentum as the hoop was removed.
A man is standing on the edge of a 20.0 m high cliff. He throws a rock horizontally with an initial velocity of 10.0 m/s. How long does it take to reach the ground? How far does the rock land from the base of the cliff?
Answer:
t = 4.08 s
R = 40.8 m
Explanation:
The question is asking us to solve for the time of flight and the range of the rock.
Let's start by finding the total time it takes for the rock to land on the ground. We can use this constant acceleration kinematic equation to solve for the displacement in the y-direction:
Δx = v_0 t + 1/2at²We have these known variables:
(v_0)_y = 0 m/sa_y = -9.8 m/s²Δx_y = -20 mAnd we are trying to solve for t (time). Therefore, we can plug these values into the equation and solve for t.
-20 = 0t + 1/2(-9.8)t² -20 = 1/2(-9.8)t²-20 = -4.9t²t = 4.08 secThe time it takes for the rock to reach the ground is 4.08 seconds.
Now we can use this time in order to solve for the displacement in the x-direction. We will be using the same equation, but this time it will be in terms of the x-direction.
List out known variables:
v_0 = 10 m/st = 4.08 sa_x = 0 m/sWe are trying to solve for:
Δx_x = ?By using the same equation, we can plug these known values into it and solve for Δx.
Δx = 10 * 4.08 + 1/2(0)(4.08)² Δx = 10 * 4.08Δx = 40.8 mThe rock lands 40.8 m from the base of the cliff.
Can someone help me with this question??
Answer:
3.3
Explanation:
. A motorist is speeding along at 33m/s when he sees a squirrel on the road 200 meters in
front of him. He tries to stop, but it takes 12 seconds for his car to stop
(a) What is the acceleration of the car? (assume acceleration was constant)
(b) Does the squirrel survive?
(c) How fast was the car moving at 100 meters?
Hello!
a)
Use the kinematic equation to solve for the acceleration:
[tex]v_{f} = v_{i} + at[/tex]
In this instance, the final velocity is 0 because he comes to a stop. We can solve for the acceleration by plugging in the given values:
0 = 33 + (12)a
0 = 33 + 12a
-33 = 12a
-33 / 12 = a --> a = -2.75 m/s²
b) Find the amount of distance necessary to stop. Use the formula:
[tex]v_{f} ^{2} = v_{i} ^{2} + 2ad[/tex]
Plug in the values:
0² = 33² + 2(-2.75 · d)
0 = 1089 - 5.5d
-1089 = -5.5d
d = 198 meters. Therefore, the squirrel would survive.
c)
Find the velocity at 100 meters by using the same formula as before:
[tex]v_{f} ^{2} = v_{i} ^{2} + 2ad[/tex]
However, in this instance, we are solving for the final velocity. Plug in the given points to solve:
vf² = 33² + 2(-2.75 · 100)
vf² = 1089 + (-550)
vf² = 539
vf = √539
vf ≈ 23.22 m/s.
you showed me what true love is really like and made my confidence come back :) couldn't have asked for anything better!!
Answer:
lucky you cointinue
Explanation:
thxs for free points
Four quartz samples of equal size and shape were placed in a stream. Which of the four quartz samples below has most likely been transported farthest in the stream?
I've attached the complete question.
Answer:
Option D
Explanation:
From the quartz images attached, we can see they now have different shapes, level of roughness and irregularity. However, the one that will have transported farthest will be option D which is the one that looks circular and has undergone the most abrasion from its body surface and size so far . This is because abrasion is a type of weathering were rocks and sediments wear out their surfaces by grinding out against each other.
The only option that looks to have undergone the most abrasion which means has transported the farthest is the sample in option D
Land plants are adapted to survive on land through stomata to regulate water regulation, specialized cells, structures that collect sunlight, and water!
Answer:
stomata to regulate water
specialized cells
Explanation:
Land plants are able to successfully adapt to staying on land through the use of stomata to regulate water loss and through the development of specialized cells that give support to grow erect.
Water regulation is important for the survival of plants on land, otherwise, they may face desiccation as a result of the heat from the sun. The stomata is a structure found on the leaves of land plants that open and close to regulate the amount of water lost to the environment through evapotranspiration. When there is adequate water and the plant can afford to lose some water, the stomata open, otherwise, the stomata close.
Support is also important for land plant's survival and the development of specialized cells in the form of sclerenchyma cells take care of this. The fibers and sclerids are two types of sclerenchyma cells that primarily function to support the land plants.
In the data table, distance is measured in meters and time is in seconds. Calculate the man's average velocity using the
equation average velocity = total distance
Answer:
what data table?
i can help if you attach a picture of the data :)
Answer:
equation average velocity = total distance
equation average velocity = total distance
Explanation:
It took a bulldozer 62,000 J of work to move a rock 30 m. It took 5 minutes. How much force did the bulldozer have to apply?
A- 2066.6 N
B- 413.33 N
C- 12,400 N
D- 10,333.33 N
Answer:
A (2066,6 N)
Explanation:
Use the Work formula
62.000J = F . 30
62.000/30 = 2066,6 N
The amout of time it took to move the rock doesn´t matter at all.
It is called a distraction variable, We don´t need it to solve the problem it is there just to confuse.
A 0.05 kg ball is attached to the end of a 0.5 m long string. The ball is spun around a circle with a period of 0.20 s. What is the tension force in the string?
The ball spins once around the circle in 0.20 s, meaning it travels a distance equal to its circumference in that time, giving it a linear speed of
v = (2π (0.5 m)) / (0.20 s) = 5π m/s ≈ 15.708 m/s
Use this compute the magnitude of the centripetal acceleration a :
a = v²/ (0.5 m) = 50π² m/s² ≈ 493.48 m/s²
Use Newton's second law to compute the mangitude of the tension F in the string:
F = (0.05 kg) a = 5/2 π² N ≈ 24.674 N ≈ 25 N
Describe the water cycle process starting from an afternoon thunderstorm. There are many different variations that could happen.
Explanation:
The water cycle basically involves five steps:
evaporation and transpiration ⇄condensation, ⇄precipitation, ⇄runoff, ⇄infiltration ⇄So when a thunderstorm occurs it helps in completing the precipitation process by enabling the release of water vapor stored up in the atmosphere to fall on the ground as rain.
After this, the water runoffs to the surface of the ground, on plants, into rocks, rivers, and lakes.
Next, the Infiltration process enables the water on the ground surface to enter the soil some of which becomes groundwater.
The cycle begins again as the evaporation and transpiration process begins, where the groundwater as a result of heat from the sun is taken back into the atmosphere, while water in plants by means of transpiration goes back into the atmosphere.
It then condenses and falls back as precipitation again.
The water cycle is the continuous movement of water within the atmosphere and surface and it is described by five major steps.
The given problem is based on the concept of water cycle. The continuous movement of water within the Earth and its atmosphere, is known as water cycle. The water cycle basically involves five steps:
evaporation and transpiration condensation precipitation,runoff infiltrationSo when a thunderstorm occurs it helps in completing the precipitation process by enabling the release of water vapor stored up in the atmosphere to fall on the ground as rain.
After this, the water runoffs to the surface of the ground, on plants, into rocks, rivers, and lakes. Next, the Infiltration process enables the water on the ground surface to enter the soil some of which becomes groundwater.
The cycle begins again as the evaporation and transpiration process begins, where the groundwater as a result of heat from the sun is taken back into the atmosphere, while water in plants by means of transpiration goes back into the atmosphere. It then condenses and falls back as precipitation again.
Thus, we can conclude that the water cycle is the continuous movement of water within the atmosphere and surface and it is described by five major steps.
Learn more about the water cycle here:
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An object of mass m is traveling in a circle with centripetal force f c. If the velocity of the object is v, what is the radius of the circle?
Answer:
r = mv^2/ Fc
Explanation:
Got it right
Which visible quality of smoke shows that it contains a
lot of gas influencing the other particles?
O The shade of the color is different in different places.
O Smoke usually has an unpleasant smell.
O Smoke rises out of very hot substances.
O The shape of the smoke changes very easily.
Answer:
C: Smoke rises out of very hot substances
Explanation:
Edge
Answer:
It's D.
Explanation:
How did Hypatia contribute to the study of philosophy? She became a teacher at Alexandria. She improved upon the works of Plato. She was educated in both science and mathematics. She studied Euclid’s theories and proved them incorrect.
Answer:
she improved upon the works of plato
Answer: A she became a teacher at Alexandria
Explanation:
A murder victim is found slumped over his desk in his office. The bullet that killed him is found lodged in his chair. Investigators find footprints in the carpet and gather traces of silica used to make concrete from the footprints. Their prime suspect is a construction supervisor who recently had an argument with the victim. The suspect's construction firm regularly uses a brand of concrete with high concentrations of silica. On the victim's desk is a threatening letter from the suspect regarding a disagreement between them. The suspect's fingerprints are found on the letter. Which of these pieces of evidence is showing a class characteristic?
A. The fingerprints on the letter belonging to the suspect
B. The silica in the carpet being like the concrete that the suspect's company uses
C. The victim being killed with his own gun
D. The suspect being angry enough with the victim to threaten him