Answer:
0.180
Explanation:
(Applied Force) / (Weight) = Coefficient of kinetic friction
(77.4 N) / (43.8 kg * 9.81 m/s/s) = 0.180
.180 is indeed the correct answer for acellus
Why do tin roofs make creaking sounds on hot days?
Answer: Yes, on many slate-roofed homes as temperatures change, such as cooling at night or heating during the day, thermal expansion or contraction of the slates may cause movement that in turn causes snapping, popping, or cracking noises, even bangs and clanks or clicks from the roof.
Explanation:
Answer:
because of its mealting
Explanation:
hope it helps you
Calculate the momentum when a toy car of mass 140g moves at 5m/s
Answer:
MOMENTUM= FORCE*MASS
= 140*5
= 700 kg⋅m/s
!!AYO I NEED HELP, YOU WILL GET 100 POINTS :)
In everyday language, the term acceleration is used to describe something that is speeding up, while deceleration is used to describe something that is slowing down. In physics, the word deceleration is not used at all. Instead, physicists talk about positive and negative acceleration. To understand this better, think about an object that is slowing down continuously until it stops, and then it starts to speed up and go backwards. The object is involved in one continuous process, so it does not make sense to use two different and opposite terms (acceleration and deceleration) to describe the same process. Acceleration is simply a vector quantity that involves a magnitude and a direction. Post a few short scenarios involving motion, in which you describe what is happening in everyday terms, including deceleration. Examine the postings of your classmates. Try to describe their scenarios using the scientific concepts of positive and negative acceleration. Examine the attempts of your classmates to describe motion scenarios using negative acceleration. Do you think they correctly describe the motion in the scenarios? Suggest any improvements that are necessary to make the descriptions correct
An example of acceleration is someone that's riding a carousel and a skydiver that's in free fall and deceleration is when one presses the brake while driving.
What is acceleration?It should be noted that acceleration simply means the rate at which velocity changes with time.
In this case, an example of acceleration is someone that's riding a carousel and a skydiver that's in free fall and deceleration is when one presses the brake while driving. Acceleration can also be the fall of an apple from the tree.
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How do biological and environmental factors affect behavior?
Answer:
biological: they can affect our train of thought and how we do or react to things. (Biological factors that influence human behavior can consist of our drive to be warm, fed, sheltered, have companionship (with some humans having stronger biological drives to reproduce), and be free from harm and oppression.)
environmental: the environment can influence mood. (The environment can facilitate or discourage interactions among people and the subsequent benefits of social support)
Explanation:
hope this helps
have an awesome day -TJ
if this helps pls give brainliest :)
How is the final speed of the cart related to the pattern in the position data?
Answer:
it increases
Explanation:
The final speed of the cart increases in relation to the pattern in the position data.
What is speed?The rate at which an object moves along a path in time is defined as speed, whereas velocity is the rate and direction of movement.In other words, speed is a scalar value, whereas velocity is a vector. The symbol for velocity is v (italic), and the symbol for speed is v. (boldface). To represent average values, a bar is placed over the symbol.The ratio of an object's distance travelled (in any direction) to the time required to travel that distance. The rate at which the position of an object changes in any direction.The ratio of distance traveled to time spent traveling is defined as speed. Speed is a scalar quantity because it has only one direction and no magnitude.To learn more about velocity, refer to:
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#SPJ2
CAN ANYONE PLS WRITE A POEM ABOUT NEON!!!!!!!!
Colors so bright
They catch your eye
You can see them from miles away
They shine in the night
Such beauty from dye
Oh so many ways they can array
litterly just got this off the top of my head. it was fun making.
Fast food and juice boxes are example of which of these?
0 air pollution
0 water pollution
0 habitat destruction
0 overpackaging
Answer:
habitat destruction I think so
4–15. The post is made of Douglas fir and has a diameter of 100 mm. If it is subjected to the load of 20 kN and the soil provides a frictional resistance that is distributed along its length and varies linearly from w = 4 kN>m at y = 0 to w = 12 kN>m at y = 2 m, determine the force F at its bottom needed for equilibrium. Also, what is the displacement of the top of the post A with respect to its bottom B? Neglect the weight of the post.
The image of the Douglas fir post is missing, so i have attached it.
Answer:
-0.00025918 mm
Explanation:
We are given the points it passes through as;
(y1, w1) = (0, 4)
(y2, w2) = (2, 12)
Thus, the slope is;
K = (w2 - w1)/(y2 - y1)
K = (12 - 4)/(2 - 0)
K = 8/2
K = 4
Now, substituting one of the points into the slope equation, we have;
w - w1 = k(y - y1)
w - 4 = 4(y - 0)
w = 4y + 4
For us to now find the total force the distributed load applies to the body, we will integrate to give;
W(y) = ∫w•dy
Thus;
W(y) = ∫(4y + 4)dy
W(y) = 2y² + 4y
So, the value of this force which is at y = 2 m will be;
W(2) = 2(2²) + 4(2)
W(2) = 16 KN
Now, at equilibrium, we sum up the forces in the vertical y-direction to give;
W - 20 + F = 0
F = 20 - W
F = 20 - 16
F = 4 KN
If we cut through the body to get a free body diagram and sum forces in y-direction to zero, the displacement of the top of the post A with respect to its bottom B is;
δ_B/A = [(L, 0∫)(W - 20)dy]/AE
Where A is πr²
We are given diameter = 100 mm
So, radius = 100/2 = 50 mm = 0.05 m
Also, from tables the Young's modulus of Douglas fir is 13.1 GPa or 13.1 × 10^(9) Pa
Thus;
δ_B/A = [(2, 0∫)(2y² + 4y - 20)dy]/(π × 0.05² × 13.1 × 10^(9))
δ_B/A = [((2 × 2³/3) + (2 × 2²) - 20(2)) - 0] /(0.102887 × 10^(9))
δ_B/A = (16/3 + 8 - 40)/(0.102887 × 10^(9))
δ_B/A = -0.00000025918 m = -0.00025918 mm
Which tools would Sara use to find an irregularly shaped object’s mass and volume?
a meter stick, a ruler, and water
a meter stick, a balance, and water
a balance, water, and a ruler
a balance, water, and a beaker
Answer:
D. a balance, water, and a beaker
Hope this helps!
Answer:
Explanation:
D. a balance, water, and a beaker
When a 200g block is placed on the piston, the volume of the gas goes from 5×10−5m3 to 4.7×10−5m3, while the pressure goes from 5.4×104Pa to 5.7×104Pa . If the surface area of the piston is 1×10−3m2 , the energy transferred to the gas due to the compression is most nearly
Answer:
The energy transferred to the gas is 9 mJ
Explanation:
Given;
initial volume of the gas, v₁ = 5 x 10⁻⁵ m³
final volume of the gas, v₂ = 4.7 x 10⁻⁵ m³
initial pressure of the gas, P₁ = 5.4 x 10⁴ Pa
final pressure of the gas, P₂ = 5.7 x 10⁴ Pa
The work done in compressing the gas is given by;
W = ΔPV = (P₂ - P₁)(V₂ - V₁)
W = (5.7 x 10⁴ Pa - 5.4 x 10⁴ Pa)(4.7 x 10⁻⁵ m³ - 5 x 10⁻⁵ m³)
W = (3000)( -3 x 10⁻⁶)
W = - 9 x 10⁻³ J
W = -9 mJ
Thus, the work done in compressing this gas is equal to the energy transferred to the gas = 9 mJ
1.1
Which of the following pairs can be classified as vectors?
A. Friction and mass
B. Mass and inertia
C. Inertia and weight
D. Weight and friction
Answer:
C
Explanation:
vectors are any quantities that have both magnitude and direction
therefore both inertia and weight are both vectors
Mars has two moons that are most similar in character to ________. Earth's Moon comets small asteroids particles in the rings of Saturn
Answer:
Small asteroids
Explanation:
Mars has 2 moons, Phobos and Deimos, that each have characteristics similar to small asteroids.
Assertion : Human ear converts vibration with audible frequencies into electric signals. Reason : Audible sound lies in the range of 20 to 2000 Hz. *
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A)
Both assertion (A) and reason (R) are true but reason (R) is the not the correct explanation of assertion (A) Assertion (A) is true but reason (R) is false.
Assertion (A) is false but reason (R) is true.
Both Assertion and Reason is false
Light is coming from the left; which is a concave mirror? flat rectangle from the end half circle crescent crescent flipped.
Half circle crescent shape represents the shape of concave mirror which is also known as converging mirror.
What is concave mirror?A concave mirror which also called converging mirror, has a reflecting surface that goes inward. Concave mirrors are used to focus light so we can conclude that Half circle crescent shape represents the shape of concave mirror and also known as converging mirror.
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Answer:
the answer is C
Explanation:
just got it right hope this helps! :D
How much work is required to lift a 35-kg object from the ground 3.0-m into the air?
Also; How much Gravitational Potential Energy did the object gain?
The amount of work required to lift the object is 1029 J. And the amount of potential energy gained by the object is 1029 J.
What is work?Work can be defined as the product of force and distance. The s.i unit of work is Joules (J).
To calculate the amount of work required to lift the object, we use the formula below.
Formula:
W = mgh........... Equation 1Where:
P.E = work required to lift the objectm = mass of the objecth = height of the objectg = acceleration due to gravityFrom the question,
Given:
m = 35 kgh = 3 mg = 9.8 m/s²Substitute these values into equation 1
W = 35×3×9.8W = 1029 J.The amount of gravitational potential energy gained by the object is the same s the amount of work required to lift the object
Therefore,
P.E = W = 1029 JHence, The amount of work required to lift the object is 1029 J. And the amount of potential energy gained by the object is 1029 J.
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What is the value of the charge that experiences a force of 2.4 × 10–3 n in an electric field of 6.8 × 10–5 n/c? 1.6 × 10–7 c 2.5 × 10–3 c 2.8 × 10–3 c 3.5 × 101 c
The value of the charge will be 35 ×10¹ C. A charge is something experienced as a force in the electric and megnetic field.
what is the charge?When the matter is put in an electromagnetic field, it has an electric charge, which causes it to experience a force. A positive or negative electric charge can exist.
Charges that are similar repel each other, whereas charges that are dissimilar attract each other. The term "neutral" refers to an item that has no net charge.
The given data in the problem is;
F is the electric force= 2.4 × 10-³ N
q is the electric charge=?
E is the strength of the electric field = 6.8 × 10⁻⁵ (N/C)
The electric force is given by;
[tex]\rm F =qE \\\\ \rm q= \frac{F}{E} \\\\ \rm q= \frac{2.4 \times 10^{-3}}{6.8 \times 10^{-5}} \\\\ \rm q=35 \times 10^1 \ C[/tex]
Hence the value of the charge will be 35 ×10¹ C
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Answer:
D
Explanation:
E2020
Which of the following objects is in static equilibrium?
A. An apple falling from a tree
B. A car moving at a constant velocity
C. A motorcycle speeding up
D. A bicycle sitting on the ground
[tex]\longrightarrow \textsf{D. A bicycle sitting on the ground} [/tex]
Solution:-Let us check all options -
A) An apple falling from a tree is under the influence of gravity. Thus some force is acting on the apple and it can not said to be in state of equilibrium. B) A car moving at a constant velocity may said to be in state of equilibrium but the since the car is in motion ,equilibrium is dynamic in nature .Thus , it is not in static equilibrium.C) A motorcycle speeding up has some acceleration due to some forces. Thus it can also not be said in state of static equilibrium.D) Since the force acting on bicycle sitting down in zero as well as it is in state of rest , thus bicycle sitting on the ground may said to be in static equilibrium.what are the two properties of a vector?
Answer:
magnitude and direction
a;most done i know im asking a lot of qeastions
Answer:
I cannot see the choices for no. 10, so I'll answer no. 8 and no. 9.
8. a. keep the Earth from tilting on its axis
9. c. an Earth-centered to a sun-centered model
Explanation:
8. The tilting of the Earth on its axis (23.5 degrees) is greatly related to the weather/seasons in different countries. It also affects the amount of daylight that a specific area receives. Keeping the Earth from tilting on its axis would allow your area to receive the same length of sunlight because not tilting at all leads to fewer number of variations.
9. The Earth was thought to be the center of the universe in accordance to the Ptolemaic system. However, this changed through "Heliocentrism," which states that the "sun" is the center of the solar system.
A soccer ball is kicked at an angle of 40° from the ground at a speed of 30 m/s. 1. Describe which motion (horizontal of vertical) of the ball is constant and which is accelerated
2. What are the vertical and horizontal components of the ball's initial velocity? 3. For what length of time is the ball in the air assuming the ground is flat and horizontal?
4. What is the range of the ball assuming the ground is flat and horizontal?
Answer:
(1). This motion is projectile motion.
(2). The horizontal initial velocity is 19.3 m/s.
The vertical initial velocity is 22.9 m/s.
(3). The time is 3.9 sec.
(4). The range of the ball assuming the ground is flat and horizontal is 90.4 m.
Explanation:
Given that,
Angle = 40°
Velocity = 30 m/s
(1). A soccer ball is kicked at an angle from the ground at a speed of 30 m/s.
So, this motion will be projectile motion.
(2). We need to calculate the vertical and horizontal components of the initial velocity of the ball
Using formula of vertical initial velocity
[tex]u_{y}=u\cos\theta[/tex]
Put the value into the formula
[tex]u_{y}=30\cos40[/tex]
[tex]u_{y}=22.9\ m/s[/tex]
Horizontal initial velocity ,
[tex]u_{x}=u\sin\theta[/tex]
Put the value into the formula
[tex]u_{x}=30\sin40[/tex]
[tex]u_{x}=19.3\ m/s[/tex]
(3). We need to calculate the time
Using formula of time
[tex]t=\dfrac{2u\sin\theta}{g}[/tex]
Put the value into the formula
[tex]t=\dfrac{2\times19.3}{9.8}[/tex]
[tex]t=3.9\ sec[/tex]
(4). We need to calculate the range of the ball assuming the ground is flat and horizontal
Using formula of range
[tex]R=\dfrac{v^2\sin2\theta}{g}[/tex]
Put the value into the formula
[tex]R=\dfrac{30^2\sin80}{9.8}[/tex]
[tex]R=90.4\ m[/tex]
Hence, (1). This motion is projectile motion.
(2). The horizontal initial velocity is 19.3 m/s.
The vertical initial velocity is 22.9 m/s.
(3). The time is 3.9 sec.
(4). The range of the ball assuming the ground is flat and horizontal is 90.4 m.
What happens when a light wave is refracted? Question 1 options: The waves spread out. The wave changes direction. The wave is scattered. The wave changes frequency.
When light wave is refracted, the wave changes direction.
What is Wave Refraction?Refraction of waves refer to the process that result in a change in waves direction as the wave is transmitted from one medium to another. Refraction of wave can be the process of bending of the path of the waves which is caused by a change in speed and wavelength of the waves.
Therefore, When light wave is refracted, the wave changes direction.
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When conducting this experiment, some procedures call for heating the substance several
times and recording the mass after each heating, continuing until the mass values are
constant. Explain the purpose of this process and how it might reduce errors.
Answer:
when completing a science experiment it is important to run multiple tests do as to reduce the risk of any outliers of false results
The purpose of this process is to reduce the risk of having outliers of false results
Although the experiment you are referring to in your question is missing the general principle when conducting an experiment is the running of multiple tests before coming up with an actual test result.
Therefore when completing a science experiment it is important to run multiple tests like heating the substance several times until a constant mass value is obtained, in other to ascertain the results. the reason why such process is undertaken is to reduce the risk of having outliers of false results. Also
A scientific experiment involves several procedures and this depends on the type and purpose of the experiment.
for example: An experiment with the purpose of determining how the mass of an object reacts to heat will require the mass of the object to be recorded after heating the object/substance several times.
Hence we can conclude that the purpose of the process is to reduce the risk of having outliers of false results.
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A cell phone uses a 3. 0 V battery. The circuit board it uses needs a 0. 05 A current. What size resistor is needed to generate this current? Ω.
The value of resistance will be 60 ohms. Resistance is the opposition force offered to the flow of electric current. The ratio of the voltage to the electric current passing through the wire.
What is a resistor?A resistor is a two-terminal passive electrical component that acts as a circuit element by implementing electrical resistance.
Resistors are used to limit current flow, alter signal levels, divide voltages, bias active devices, and complete transmission lines in electronic circuits.
The given data in the problem is;
V is the voltage = 3. 0 V
I is value of electric current= 0. 05 A
R is the resistance=?
According to ohm's law, the potential difference between the two ends of the conductor is equal to the product of electric current and the resistance generated.
So from the ohm law;
V= IR
[tex]\rm R = \frac{V}{I} \\\\ \rm R = \frac{3}{0.05} \\\\ \rm R =60 \ ohm[/tex]
Hence the value of resistance will be 60 ohms.
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Para levantar del suelo una caja metálica de 50 Kg se emplea maquinaria que utiliza un cable inextensible e imprime una aceleración de 0,8 m/seg2. ¿Qué tensión soporta el cable y qué tiempo le tomará a la máquina levantar la caja a una altura de 10 metros? Lo necesito urgente
Answer:
T = 530 N , t = 12.65 s
Explanation:
This is an exercise on Newton's second law,
T - W = m a
where T is the tension of the cable, W the weight and the steel of the box
T = W + ma
the weight of a body is
W = m g
Let's replace
T = m g + ma
T = m (g + a)
let's calculate
T = 50 (9.8 + 0.8)
T = 530 N
To calculate the time we use
y = v₀t + ½ a t²
since the box starts from rest on the sole its initial velocity is zero
y = ½ a t2
t = √ 2y / a
let's calculate
t = √ (2 10 / 0.8)
t = 12.65 s
TRASLATE
Este es un ejercicio de la segunda ley de Newton,
T – W = m a
donde T es la tension del cable, W el peso y a la aceracion de la caja
T = W + ma
el pesode un cuerpo es
W = m g
Substituyamos
T = m g + ma
T = m ( g +a)
calculemos
T = 50 ( 9,8 + 0,8)
T = 530 N
Para calcular el tiempo usamos
y = v₀t + ½ a t²
como la caja parte del reposo en el suela su velocidad inicial es cero
y= ½ a t²
t= √ 2y/a
calculemos
t = √ (2 10/0,8)
t = 12,65 s
The hair shaft is made up of three layers: an __ medulla , a cortex, and an ___cuticle
- absent; colored
-Colored; absent
-inner; outer
-outer ; inner
How can a machine be made more efficient?
Answer:
Because all machines lose input work to friction, one way to improve the efficiency of a machine is by reducing friction. Hope this helped :))
Explanation:
28 points
An electric wall clock has a second hand 15 cm long. What is the radial acceleration of the tip of this hand?
A.4.25 x 10-4 m/s2
B.5.32 10-2 m/s2
C.1.64 x 10-3 m/s2
D.3.16 x 10-3 m/s2
how do you balance
___Ca + __O2 → ___CaO
Answer:
2Ca+ O2 ------> 2CaO
mark me as brainiest
please answer fully explained. don't answer for points. will mark brainlist
lighting discharge, b: stay away from tall things, and stay away from any items that conduct electricity
When energy is added to a wave, how can the wave change?.
Answer:
When energy is added to a wave How can the wave change? The energy transported by a wave is directly proportional to the square of the amplitude. So whatever change occurs in the amplitude, the square of that effect impacts the energy.
Explanation: